Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 4) - Fair Value of Plan Assets

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PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 4) - Fair Value of Plan Assets - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
UNITED STATES      
Pension and other postretirement benefits      
Fair value of plan assets $ 3,828 $ 3,548 $ 3,429
Pending Trade Purchases, Sales   2  
Accrued Investment Income Receivable 7 6  
UNITED STATES | U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 118 115  
UNITED STATES | Non-U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 31 38  
UNITED STATES | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 188 67  
UNITED STATES | Domestic Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 423 489  
UNITED STATES | Foreign Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 53 19  
UNITED STATES | Asset-backed Securities      
Pension and other postretirement benefits      
Fair value of plan assets 7    
UNITED STATES | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 508 327  
UNITED STATES | Diversified Strategies      
Pension and other postretirement benefits      
Fair value of plan assets 14    
UNITED STATES | Private markets and real assets (2)      
Pension and other postretirement benefits      
Fair value of plan assets 641 551  
UNITED STATES | Fair Value, Inputs, Level 1      
Pension and other postretirement benefits      
Fair value of plan assets 681 460  
UNITED STATES | Fair Value, Inputs, Level 1 | U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 118 115  
UNITED STATES | Fair Value, Inputs, Level 1 | Non-U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 31 38  
UNITED STATES | Fair Value, Inputs, Level 1 | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets   37  
UNITED STATES | Fair Value, Inputs, Level 1 | Foreign Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 12    
UNITED STATES | Fair Value, Inputs, Level 1 | Asset-backed Securities      
Pension and other postretirement benefits      
Fair value of plan assets 7    
UNITED STATES | Fair Value, Inputs, Level 1 | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 499 270  
UNITED STATES | Fair Value, Inputs, Level 1 | Diversified Strategies      
Pension and other postretirement benefits      
Fair value of plan assets 14    
UNITED STATES | Significant other observable inputs Level 2      
Pension and other postretirement benefits      
Fair value of plan assets 661 595  
UNITED STATES | Significant other observable inputs Level 2 | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 188 30  
UNITED STATES | Significant other observable inputs Level 2 | Domestic Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 423 489  
UNITED STATES | Significant other observable inputs Level 2 | Foreign Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 41 19  
UNITED STATES | Significant other observable inputs Level 2 | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 9 57  
UNITED STATES | Fair Value, Inputs, Level 3      
Pension and other postretirement benefits      
Fair value of plan assets 641 551 431
UNITED STATES | Fair Value, Inputs, Level 3 | Real Assets      
Pension and other postretirement benefits      
Fair value of plan assets 82 80 72
UNITED STATES | Fair Value, Inputs, Level 3 | Private markets and real assets (2)      
Pension and other postretirement benefits      
Fair value of plan assets 641 551  
UNITED STATES | Fair Value, Inputs, Level 1, 2 and 3      
Pension and other postretirement benefits      
Fair value of plan assets 1,983 1,606  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share      
Pension and other postretirement benefits      
Fair value of plan assets 1,838 1,934  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 227 361  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Asset-backed Securities      
Pension and other postretirement benefits      
Fair value of plan assets 277 262  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Diversified Strategies      
Pension and other postretirement benefits      
Fair value of plan assets 18    
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 938 995  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Global Equities      
Pension and other postretirement benefits      
Fair value of plan assets 224 145  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Real Assets      
Pension and other postretirement benefits      
Fair value of plan assets 154 171  
UNITED KINGDOM      
Pension and other postretirement benefits      
Fair value of plan assets 1,670 2,390 2,337
Pending Trade Purchases, Sales 141    
Accrued Investment Income Receivable 2    
UNITED KINGDOM | U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 13 79  
UNITED KINGDOM | Non-U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 9 74  
UNITED KINGDOM | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 222    
UNITED KINGDOM | Domestic Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 24    
UNITED KINGDOM | Foreign Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 80    
UNITED KINGDOM | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 38 35  
UNITED KINGDOM | Insurance      
Pension and other postretirement benefits      
Fair value of plan assets 428 514  
UNITED KINGDOM | Private markets and real assets (2)      
Pension and other postretirement benefits      
Fair value of plan assets 390 389  
UNITED KINGDOM | Fair Value, Inputs, Level 1      
Pension and other postretirement benefits      
Fair value of plan assets 49 35  
UNITED KINGDOM | Fair Value, Inputs, Level 1 | U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 13    
UNITED KINGDOM | Fair Value, Inputs, Level 1 | Non-U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 9    
UNITED KINGDOM | Fair Value, Inputs, Level 1 | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 27 35  
UNITED KINGDOM | Significant other observable inputs Level 2      
Pension and other postretirement benefits      
Fair value of plan assets 337 153  
UNITED KINGDOM | Significant other observable inputs Level 2 | U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets   79  
UNITED KINGDOM | Significant other observable inputs Level 2 | Non-U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets   74  
UNITED KINGDOM | Significant other observable inputs Level 2 | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 222    
UNITED KINGDOM | Significant other observable inputs Level 2 | Domestic Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 24    
UNITED KINGDOM | Significant other observable inputs Level 2 | Foreign Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 80    
UNITED KINGDOM | Significant other observable inputs Level 2 | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 11    
UNITED KINGDOM | Fair Value, Inputs, Level 3      
Pension and other postretirement benefits      
Fair value of plan assets 818 903 838
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Real Assets      
Pension and other postretirement benefits      
Fair value of plan assets 8 33 31
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Insurance      
Pension and other postretirement benefits      
Fair value of plan assets 428 514 $ 556
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Private markets and real assets (2)      
Pension and other postretirement benefits      
Fair value of plan assets 390 389  
UNITED KINGDOM | Fair Value, Inputs, Level 1, 2 and 3      
Pension and other postretirement benefits      
Fair value of plan assets 1,204 1,091  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share      
Pension and other postretirement benefits      
Fair value of plan assets 323 1,299  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 64    
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Asset-backed Securities      
Pension and other postretirement benefits      
Fair value of plan assets 128 99  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Diversified Strategies      
Pension and other postretirement benefits      
Fair value of plan assets 0 51  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 77 894  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Global Equities      
Pension and other postretirement benefits      
Fair value of plan assets 0 194  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Reinsurance      
Pension and other postretirement benefits      
Fair value of plan assets $ 54 $ 61