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, 2023
Dec. 31, 2022
Dec. 31, 2021
UNITED STATES      
Pension and other postretirement benefits      
Fair value of plan assets $ 3,826 $ 3,828 $ 3,548
Pending Trade Purchases, Sales (16)    
Accrued Investment Income Receivable 10 7  
UNITED STATES | U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 73 118  
UNITED STATES | Non-U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 36 31  
UNITED STATES | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 157 188  
UNITED STATES | Domestic Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 603 423  
UNITED STATES | Foreign Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 49 53  
UNITED STATES | Asset-backed Securities      
Pension and other postretirement benefits      
Fair value of plan assets 8 7  
UNITED STATES | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 467 508  
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 604 641  
UNITED STATES | Fair Value, Inputs, Level 1      
Pension and other postretirement benefits      
Fair value of plan assets 576 681  
UNITED STATES | Fair Value, Inputs, Level 1 | U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 73 118  
UNITED STATES | Fair Value, Inputs, Level 1 | Non-U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 36 31  
UNITED STATES | Fair Value, Inputs, Level 1 | Foreign Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 0 12  
UNITED STATES | Fair Value, Inputs, Level 1 | Asset-backed Securities      
Pension and other postretirement benefits      
Fair value of plan assets 0 7  
UNITED STATES | Fair Value, Inputs, Level 1 | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 467 499  
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 817 661  
UNITED STATES | Significant other observable inputs Level 2 | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 157 188  
UNITED STATES | Significant other observable inputs Level 2 | Domestic Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 603 423  
UNITED STATES | Significant other observable inputs Level 2 | Foreign Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 49 41  
UNITED STATES | Significant other observable inputs Level 2 | Asset-backed Securities      
Pension and other postretirement benefits      
Fair value of plan assets 8 0  
UNITED STATES | Significant other observable inputs Level 2 | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 0 9  
UNITED STATES | Fair Value, Inputs, Level 3      
Pension and other postretirement benefits      
Fair value of plan assets 604 641 551
UNITED STATES | Fair Value, Inputs, Level 3 | Real Assets      
Pension and other postretirement benefits      
Fair value of plan assets 67 82 80
UNITED STATES | Fair Value, Inputs, Level 3 | Private markets and real assets (2)      
Pension and other postretirement benefits      
Fair value of plan assets 604 641  
UNITED STATES | Fair Value, Inputs, Level 1, 2 and 3      
Pension and other postretirement benefits      
Fair value of plan assets 1,997 1,983  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share      
Pension and other postretirement benefits      
Fair value of plan assets 1,835 1,838  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 257 227  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Asset-backed Securities      
Pension and other postretirement benefits      
Fair value of plan assets 307 277  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Diversified Strategies      
Pension and other postretirement benefits      
Fair value of plan assets 0 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 915 938  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Global Equities      
Pension and other postretirement benefits      
Fair value of plan assets 222 224  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Real Assets      
Pension and other postretirement benefits      
Fair value of plan assets 134 154  
UNITED KINGDOM      
Pension and other postretirement benefits      
Fair value of plan assets 1,720 1,670 2,390
Pending Trade Purchases, Sales 1 141  
Accrued Investment Income Receivable 2 2  
UNITED KINGDOM | U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 12 13  
UNITED KINGDOM | Non-U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 8 9  
UNITED KINGDOM | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 232 222  
UNITED KINGDOM | Domestic Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 30 24  
UNITED KINGDOM | Foreign Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 95 80  
UNITED KINGDOM | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 35 38  
UNITED KINGDOM | Insurance      
Pension and other postretirement benefits      
Fair value of plan assets 436 428  
UNITED KINGDOM | Private markets and real assets (2)      
Pension and other postretirement benefits      
Fair value of plan assets 103 390  
UNITED KINGDOM | Fair Value, Inputs, Level 1      
Pension and other postretirement benefits      
Fair value of plan assets 37 49  
UNITED KINGDOM | Fair Value, Inputs, Level 1 | U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 12 13  
UNITED KINGDOM | Fair Value, Inputs, Level 1 | Non-U.S. Equity      
Pension and other postretirement benefits      
Fair value of plan assets 8 9  
UNITED KINGDOM | Fair Value, Inputs, Level 1 | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 17 27  
UNITED KINGDOM | Significant other observable inputs Level 2      
Pension and other postretirement benefits      
Fair value of plan assets 375 337  
UNITED KINGDOM | Significant other observable inputs Level 2 | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 232 222  
UNITED KINGDOM | Significant other observable inputs Level 2 | Domestic Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 30 24  
UNITED KINGDOM | Significant other observable inputs Level 2 | Foreign Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 95 80  
UNITED KINGDOM | Significant other observable inputs Level 2 | Net cash equivalents      
Pension and other postretirement benefits      
Fair value of plan assets 18 11  
UNITED KINGDOM | Fair Value, Inputs, Level 3      
Pension and other postretirement benefits      
Fair value of plan assets 539 818 903
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Real Assets      
Pension and other postretirement benefits      
Fair value of plan assets 7 8 33
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Insurance      
Pension and other postretirement benefits      
Fair value of plan assets 436 428 $ 514
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Private markets and real assets (2)      
Pension and other postretirement benefits      
Fair value of plan assets 103 390  
UNITED KINGDOM | Fair Value, Inputs, Level 1, 2 and 3      
Pension and other postretirement benefits      
Fair value of plan assets 951 1,204  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share      
Pension and other postretirement benefits      
Fair value of plan assets 766 323  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Government debt      
Pension and other postretirement benefits      
Fair value of plan assets 572 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 117 128  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Corporate Debt Securities      
Pension and other postretirement benefits      
Fair value of plan assets 71 77  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Reinsurance      
Pension and other postretirement benefits      
Fair value of plan assets $ 6 $ 54