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, 2020
Dec. 31, 2019
Dec. 31, 2018
UNITED STATES        
Pension and other postretirement benefits        
Fair value of plan assets   $ 3,429 $ 3,357 $ 2,937
Accrued Investment Income Receivable   5 5  
UNITED STATES | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   194 96  
UNITED STATES | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   58 47  
UNITED STATES | Government debt        
Pension and other postretirement benefits        
Fair value of plan assets   83 72  
UNITED STATES | Domestic Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   512 357  
UNITED STATES | Foreign Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   26 11  
UNITED STATES | Net cash equivalents        
Pension and other postretirement benefits        
Fair value of plan assets   356 371  
UNITED STATES | Private markets and real assets (2)        
Pension and other postretirement benefits        
Fair value of plan assets   431 371  
UNITED STATES | Asset-backed Securities        
Pension and other postretirement benefits        
Fair value of plan assets   3 1  
UNITED STATES | Fair Value, Inputs, Level 1        
Pension and other postretirement benefits        
Fair value of plan assets   649 481  
UNITED STATES | Fair Value, Inputs, Level 1 | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   194 96  
UNITED STATES | Fair Value, Inputs, Level 1 | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   58 47  
UNITED STATES | Fair Value, Inputs, Level 1 | Government debt        
Pension and other postretirement benefits        
Fair value of plan assets   78    
UNITED STATES | Fair Value, Inputs, Level 1 | Net cash equivalents        
Pension and other postretirement benefits        
Fair value of plan assets   319 338  
UNITED STATES | Significant other observable inputs Level 2        
Pension and other postretirement benefits        
Fair value of plan assets   583 474  
UNITED STATES | Significant other observable inputs Level 2 | Government debt        
Pension and other postretirement benefits        
Fair value of plan assets   5 72  
UNITED STATES | Significant other observable inputs Level 2 | Domestic Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   512 357  
UNITED STATES | Significant other observable inputs Level 2 | Foreign Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   26 11  
UNITED STATES | Significant other observable inputs Level 2 | Net cash equivalents        
Pension and other postretirement benefits        
Fair value of plan assets   37 33  
UNITED STATES | Significant other observable inputs Level 2 | Asset-backed Securities        
Pension and other postretirement benefits        
Fair value of plan assets   3 1  
UNITED STATES | Fair Value, Inputs, Level 3        
Pension and other postretirement benefits        
Fair value of plan assets   431 371 316
UNITED STATES | Fair Value, Inputs, Level 3 | Private markets and real assets (2)        
Pension and other postretirement benefits        
Fair value of plan assets   431 371  
UNITED STATES | Fair Value, Inputs, Level 3 | Real Assets        
Pension and other postretirement benefits        
Fair value of plan assets   72 72 69
UNITED STATES | Fair Value, Inputs, Level 1, 2 and 3        
Pension and other postretirement benefits        
Fair value of plan assets   1,663 1,326  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share        
Pension and other postretirement benefits        
Fair value of plan assets   1,761 2,026  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Government debt        
Pension and other postretirement benefits        
Fair value of plan assets   199 503  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   1,068 939  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Global Equities        
Pension and other postretirement benefits        
Fair value of plan assets   245 367  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Real Assets        
Pension and other postretirement benefits        
Fair value of plan assets   153 140  
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Asset-backed Securities        
Pension and other postretirement benefits        
Fair value of plan assets   96 77  
UNITED KINGDOM        
Pension and other postretirement benefits        
Fair value of plan assets   2,337 2,010 1,782
UNITED KINGDOM | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   56 45  
UNITED KINGDOM | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   69 58  
UNITED KINGDOM | Net cash equivalents        
Pension and other postretirement benefits        
Fair value of plan assets   26 35  
UNITED KINGDOM | Insurance        
Pension and other postretirement benefits        
Fair value of plan assets   556 476  
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   282 259  
UNITED KINGDOM | Fair Value, Inputs, Level 1        
Pension and other postretirement benefits        
Fair value of plan assets   26 35  
UNITED KINGDOM | Fair Value, Inputs, Level 1 | Net cash equivalents        
Pension and other postretirement benefits        
Fair value of plan assets   26 35  
UNITED KINGDOM | Significant other observable inputs Level 2        
Pension and other postretirement benefits        
Fair value of plan assets   125 103  
UNITED KINGDOM | Significant other observable inputs Level 2 | U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   56 45  
UNITED KINGDOM | Significant other observable inputs Level 2 | Non-U.S. Equity        
Pension and other postretirement benefits        
Fair value of plan assets   69 58  
UNITED KINGDOM | Fair Value, Inputs, Level 3        
Pension and other postretirement benefits        
Fair value of plan assets   838 735 686
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Real Assets        
Pension and other postretirement benefits        
Fair value of plan assets   31 35 57
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Insurance        
Pension and other postretirement benefits        
Fair value of plan assets   556 476 $ 442
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Private markets and real assets (3)        
Pension and other postretirement benefits        
Fair value of plan assets   282 259  
UNITED KINGDOM | Fair Value, Inputs, Level 1, 2 and 3        
Pension and other postretirement benefits        
Fair value of plan assets   989 873  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share        
Pension and other postretirement benefits        
Fair value of plan assets   1,348 1,137  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Corporate Debt Securities        
Pension and other postretirement benefits        
Fair value of plan assets   970 791  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Global Equities        
Pension and other postretirement benefits        
Fair value of plan assets   168 160  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Asset-backed Securities        
Pension and other postretirement benefits        
Fair value of plan assets   100 96  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Diversified Strategies        
Pension and other postretirement benefits        
Fair value of plan assets   50 60  
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Reinsurance        
Pension and other postretirement benefits        
Fair value of plan assets   $ 60 $ 30