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RETIREMENT BENEFITS - PBO and ABO Exceed Fair Value of Plan Assets (Details) - Pension Plans - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
U.S.    
PBO exceeds fair value of plan assets    
Projected benefit obligation $ 13,453 $ 12,655
Accumulated benefit obligation 13,447 12,646
Fair value of plan assets 12,717 11,490
ABO exceeds fair value of plan assets    
Projected benefit obligation 13,453 12,655
Accumulated benefit obligation 13,447 12,646
Fair value of plan assets 12,717 11,490
Non-U.S.    
PBO exceeds fair value of plan assets    
Projected benefit obligation 4,445 3,904
Accumulated benefit obligation 4,041 3,528
Fair value of plan assets 3,089 2,648
ABO exceeds fair value of plan assets    
Projected benefit obligation 2,748 3,718
Accumulated benefit obligation 2,435 3,387
Fair value of plan assets $ 1,429 $ 2,478