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RETIREMENT BENEFITS - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Change in accumulated other comprehensive income (loss)        
Balance, beginning of period     $ 201,672  
Actuarial assumptions changes and plan experience $ 603   1,119  
Net asset (loss) gain due to difference between actual and expected returns (328)   (779)  
Net amortization 54   112  
Prior service cost 0   6  
Curtailment/settlement gain 2   0  
Foreign exchange impact and other 72   36  
Change in deferred taxes, net (102)   (105)  
Change, net of tax 301 $ (135) 389 $ (147)
Balance, end of period 200,968 231,107 200,968 231,107
Benefit plans        
Change in accumulated other comprehensive income (loss)        
Balance, beginning of period (6,095) (5,176) (6,183) (5,164)
Balance, end of period $ (5,794) $ (5,311) $ (5,794) $ (5,311)