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RETIREMENT BENEFITS - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Change in accumulated other comprehensive income (loss)        
Balance, beginning of period     $ 201,672  
Actuarial assumptions changes and plan experience $ 181   1,300  
Net asset loss due to difference between actual and expected returns (140)   (919)  
Net amortization 49   161  
Curtailment/settlement gain 0   6  
Foreign exchange impact and other (35)   1  
Change in deferred taxes, net (29)   (134)  
Change, net of tax 26 $ (29) 415 $ (176)
Balance, end of period 197,863 228,622 197,863 228,622
Benefit plans        
Change in accumulated other comprehensive income (loss)        
Balance, beginning of period (5,794) (5,311) (6,183) (5,164)
Balance, end of period $ (5,768) $ (5,340) $ (5,768) $ (5,340)