Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFITS - (Details 5 ) - Level 3 Fair Value Reconciliation

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PENSION AND OTHER POSTRETIREMENT BENEFITS - (Details 5 ) - Level 3 Fair Value Reconciliation - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
UNITED STATES      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets $ 3,828 $ 3,548 $ 3,429
Defined Benefit Plan, Plan Assets, Business Combination 699 0  
UNITED STATES | Fair Value, Inputs, Level 3      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 641 551 431
Unrealized gains (losses) on assets still held at the reporting date 25 155  
Purchases, sales and settlements, net (29) (35)  
Defined Benefit Plan, Plan Assets, Business Combination 94    
UNITED STATES | Fair Value, Inputs, Level 3 | Private Markets      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 559 471 359
Unrealized gains (losses) on assets still held at the reporting date 6 144  
Purchases, sales and settlements, net (12) (32)  
Defined Benefit Plan, Plan Assets, Business Combination 94    
UNITED STATES | Fair Value, Inputs, Level 3 | Real Assets      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 82 80 72
Unrealized gains (losses) on assets still held at the reporting date 19 11  
Purchases, sales and settlements, net (17) (3)  
Defined Benefit Plan, Plan Assets, Business Combination 0    
UNITED KINGDOM      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 1,670 2,390 2,337
Defined Benefit Plan, Plan Assets, Business Combination 565 0  
UNITED KINGDOM | Insurance      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 428 514  
UNITED KINGDOM | Fair Value, Inputs, Level 3      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 818 903 838
Unrealized gains (losses) on assets still held at the reporting date (141) 74  
Purchases, sales and settlements, net (36) (9)  
Defined Benefit Plan, Plan Assets, Business Combination 92    
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Private Markets      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 382 356 251
Unrealized gains (losses) on assets still held at the reporting date 39 114  
Purchases, sales and settlements, net (13) (9)  
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Real Assets      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 8 33 31
Unrealized gains (losses) on assets still held at the reporting date (2) 2  
Purchases, sales and settlements, net (23) 0  
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Insurance      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 428 514 $ 556
Unrealized gains (losses) on assets still held at the reporting date (178) (42)  
Purchases, sales and settlements, net 0 $ 0  
Defined Benefit Plan, Plan Assets, Business Combination $ 92