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RETIREMENT BENEFITS - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Change in accumulated other comprehensive income (loss)      
Balance, beginning of period $ 197,074    
Actuarial assumptions changes and plan experience (795)   $ 1,288
Net asset gain (loss) due to difference between actual and expected returns 690   (1,732)
Net amortization 62   214
Prior service cost 0   (7)
Curtailment/settlement gain 0   7
Foreign exchange impact and other (25)   136
Change in deferred taxes, net 4   20
Change, net of tax (64) $ 88 (74)
Balance, end of period 197,015 202,866 197,074
Benefit plans      
Change in accumulated other comprehensive income (loss)      
Balance, beginning of period (6,257) (6,183) (6,183)
Balance, end of period $ (6,321) $ (6,095) $ (6,257)