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RETIREMENT BENEFITS - PBO and ABO Exceed Fair Value of Plan Assets (Details) - Pension Plans - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
U.S.    
PBO exceeds fair value of plan assets    
Projected benefit obligation $ 537 $ 545
Accumulated benefit obligation 537 545
Fair value of plan assets 0 0
ABO exceeds fair value of plan assets    
Projected benefit obligation 537 545
Accumulated benefit obligation 537 545
Fair value of plan assets 0 0
Non-U.S.    
PBO exceeds fair value of plan assets    
Projected benefit obligation 3,747 3,463
Accumulated benefit obligation 3,453 3,179
Fair value of plan assets 2,311 2,374
ABO exceeds fair value of plan assets    
Projected benefit obligation 3,510 3,315
Accumulated benefit obligation 3,258 3,088
Fair value of plan assets $ 2,100 $ 2,252