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RETIREMENT BENEFITS - PBO and ABO Exceed Fair Value of Plan Assets (Details) - Pension Plans - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
U.S.    
PBO exceeds fair value of plan assets    
Projected benefit obligation $ 683 $ 736
Accumulated benefit obligation 682 734
Fair value of plan assets 0 0
ABO exceeds fair value of plan assets    
Projected benefit obligation 683 736
Accumulated benefit obligation 682 734
Fair value of plan assets 0 0
Non-U.S.    
PBO exceeds fair value of plan assets    
Projected benefit obligation 3,966 4,849
Accumulated benefit obligation 3,574 4,400
Fair value of plan assets 2,616 3,310
ABO exceeds fair value of plan assets    
Projected benefit obligation 3,809 4,723
Accumulated benefit obligation 3,477 4,329
Fair value of plan assets $ 2,486 $ 3,212