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, 2024
Dec. 31, 2023
Dec. 31, 2022
UNITED STATES      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets $ 3,706 $ 3,826 $ 3,828
UNITED STATES | Fair Value, Inputs, Level 3      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 500 604 641
Unrealized gains (losses) on assets still held at the reporting date (9) (7)  
Purchases, sales and settlements, net (95) (30)  
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 441 537 559
Unrealized gains (losses) on assets still held at the reporting date (3) 6  
Purchases, sales and settlements, net (93) (28)  
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 59 67 82
Unrealized gains (losses) on assets still held at the reporting date (6) (13)  
Purchases, sales and settlements, net (2) (2)  
UNITED KINGDOM      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 1,468 1,720 1,670
UNITED KINGDOM | Insurance      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 383 436  
UNITED KINGDOM | Fair Value, Inputs, Level 3      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 485 539 818
Unrealized gains (losses) on assets still held at the reporting date (52) (27)  
Purchases, sales and settlements, net (2) (252)  
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 96 96 382
Unrealized gains (losses) on assets still held at the reporting date 1 (35)  
Purchases, sales and settlements, net (1) (251)  
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 6 7 8
Unrealized gains (losses) on assets still held at the reporting date 0 0  
Purchases, sales and settlements, net (1) (1)  
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Insurance      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 383 436 $ 428
Unrealized gains (losses) on assets still held at the reporting date (53) 8  
Purchases, sales and settlements, net $ 0 $ 0