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
1 Months Ended
Jul. 31, 2012
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
UNITED STATES        
Pension and other postretirement benefits        
Fair value of plan assets   $ 3,548 $ 3,429 $ 3,357
Pending Trade Purchases, Sales   2    
Accrued Investment Income Receivable   6 5  
UNITED STATES | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   115 194  
UNITED STATES | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   38 58  
UNITED STATES | Government debt        
Pension and other postretirement benefits        
Fair value of plan assets   67 83  
UNITED STATES | Domestic Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   489 512  
UNITED STATES | Foreign Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   19 26  
UNITED STATES | Asset-backed Securities        
Pension and other postretirement benefits        
Fair value of plan assets     3  
UNITED STATES | Net cash equivalents        
Pension and other postretirement benefits        
Fair value of plan assets   327 356  
UNITED STATES | Private markets and real assets (2)        
Pension and other postretirement benefits        
Fair value of plan assets   551 431  
UNITED STATES | Fair Value, Inputs, Level 1        
Pension and other postretirement benefits        
Fair value of plan assets   460 649  
UNITED STATES | Fair Value, Inputs, Level 1 | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   115 194  
UNITED STATES | Fair Value, Inputs, Level 1 | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   38 58  
UNITED STATES | Fair Value, Inputs, Level 1 | Government debt        
Pension and other postretirement benefits        
Fair value of plan assets   37 78  
UNITED STATES | Fair Value, Inputs, Level 1 | Net cash equivalents        
Pension and other postretirement benefits        
Fair value of plan assets   270 319  
UNITED STATES | Significant other observable inputs Level 2        
Pension and other postretirement benefits        
Fair value of plan assets   595 583  
UNITED STATES | Significant other observable inputs Level 2 | Government debt        
Pension and other postretirement benefits        
Fair value of plan assets   30 5  
UNITED STATES | Significant other observable inputs Level 2 | Domestic Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   489 512  
UNITED STATES | Significant other observable inputs Level 2 | Foreign Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   19 26  
UNITED STATES | Significant other observable inputs Level 2 | Asset-backed Securities        
Pension and other postretirement benefits        
Fair value of plan assets     3  
UNITED STATES | Significant other observable inputs Level 2 | Net cash equivalents        
Pension and other postretirement benefits        
Fair value of plan assets   57 37  
UNITED STATES | Fair Value, Inputs, Level 3        
Pension and other postretirement benefits        
Fair value of plan assets   551 431 371
UNITED STATES | Fair Value, Inputs, Level 3 | Private markets and real assets (2)        
Pension and other postretirement benefits        
Fair value of plan assets   551 431  
UNITED STATES | Fair Value, Inputs, Level 3 | Real Assets        
Pension and other postretirement benefits        
Fair value of plan assets   80 72 72
UNITED STATES | Fair Value, Inputs, Level 1, 2 and 3        
Pension and other postretirement benefits        
Fair value of plan assets   1,606 1,663  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share        
Pension and other postretirement benefits        
Fair value of plan assets   1,934 1,761  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Government debt        
Pension and other postretirement benefits        
Fair value of plan assets   361 199  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Asset-backed Securities        
Pension and other postretirement benefits        
Fair value of plan assets   262 96  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   995 1,068  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Global Equities        
Pension and other postretirement benefits        
Fair value of plan assets   145 245  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Real Assets        
Pension and other postretirement benefits        
Fair value of plan assets   171 153  
UNITED KINGDOM        
Pension and other postretirement benefits        
Fair value of plan assets   2,390 2,337 2,010
UNITED KINGDOM | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   79 56  
UNITED KINGDOM | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   74 69  
UNITED KINGDOM | Net cash equivalents        
Pension and other postretirement benefits        
Fair value of plan assets   35 26  
UNITED KINGDOM | Insurance        
Pension and other postretirement benefits        
Fair value of plan assets   514 556  
Insurance Contract Payment Deferment Period 10 years      
UNITED KINGDOM | Private markets and real assets (3)        
Pension and other postretirement benefits        
Fair value of plan assets   389 282  
UNITED KINGDOM | Fair Value, Inputs, Level 1        
Pension and other postretirement benefits        
Fair value of plan assets   35 26  
UNITED KINGDOM | Fair Value, Inputs, Level 1 | Net cash equivalents        
Pension and other postretirement benefits        
Fair value of plan assets   35 26  
UNITED KINGDOM | Significant other observable inputs Level 2        
Pension and other postretirement benefits        
Fair value of plan assets   153 125  
UNITED KINGDOM | Significant other observable inputs Level 2 | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   79 56  
UNITED KINGDOM | Significant other observable inputs Level 2 | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   74 69  
UNITED KINGDOM | Fair Value, Inputs, Level 3        
Pension and other postretirement benefits        
Fair value of plan assets   903 838 735
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Real Assets        
Pension and other postretirement benefits        
Fair value of plan assets   33 31 35
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Insurance        
Pension and other postretirement benefits        
Fair value of plan assets   514 556 $ 476
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Private markets and real assets (3)        
Pension and other postretirement benefits        
Fair value of plan assets   389 282  
UNITED KINGDOM | Fair Value, Inputs, Level 1, 2 and 3        
Pension and other postretirement benefits        
Fair value of plan assets   1,091 989  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share        
Pension and other postretirement benefits        
Fair value of plan assets   1,299 1,348  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Asset-backed Securities        
Pension and other postretirement benefits        
Fair value of plan assets   99 100  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   894 970  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Global Equities        
Pension and other postretirement benefits        
Fair value of plan assets   194 168  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Diversified Strategies        
Pension and other postretirement benefits        
Fair value of plan assets   51 50  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Reinsurance        
Pension and other postretirement benefits        
Fair value of plan assets   $ 61 $ 60