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RETIREMENT BENEFITS - PBO and ABO Exceed Fair Value of Plan Assets (Details) - Pension Plans - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
U.S.    
PBO exceeds fair value of plan assets    
Projected benefit obligation $ 736 $ 13,453
Accumulated benefit obligation 734 13,447
Fair value of plan assets 0 12,717
ABO exceeds fair value of plan assets    
Projected benefit obligation 736 13,453
Accumulated benefit obligation 734 13,447
Fair value of plan assets 0 12,717
Non-U.S.    
PBO exceeds fair value of plan assets    
Projected benefit obligation 4,849 4,445
Accumulated benefit obligation 4,400 4,041
Fair value of plan assets 3,310 3,089
ABO exceeds fair value of plan assets    
Projected benefit obligation 4,723 2,748
Accumulated benefit obligation 4,329 2,435
Fair value of plan assets $ 3,212 $ 1,429