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RETIREMENT BENEFITS - PBO and ABO Exceed Fair Value of Plan Assets (Details) - Pension Plans - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
U.S.    
PBO exceeds fair value of plan assets    
Projected benefit obligation $ 12,655 $ 14,040
Accumulated benefit obligation 12,646 14,034
Fair value of plan assets 11,490 12,725
ABO exceeds fair value of plan assets    
Projected benefit obligation 12,655 14,040
Accumulated benefit obligation 12,646 14,034
Fair value of plan assets 11,490 12,725
Non-U.S.    
PBO exceeds fair value of plan assets    
Projected benefit obligation 3,904 2,721
Accumulated benefit obligation 3,528 2,381
Fair value of plan assets 2,648 1,516
ABO exceeds fair value of plan assets    
Projected benefit obligation 3,718 2,596
Accumulated benefit obligation 3,387 2,296
Fair value of plan assets $ 2,478 $ 1,407