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RETIREMENT BENEFITS - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Change in accumulated other comprehensive income (loss)        
Balance, beginning of period     $ 197,074  
Actuarial assumptions changes and plan experience $ (788)   (2,397)  
Net asset gain (loss) due to difference between actual and expected returns 306   1,439  
Net amortization 70   198  
Prior service cost 0   (5)  
Curtailment/settlement gain (5)   (3)  
Foreign exchange impact and other 61   14  
Change in deferred taxes, net 106   187  
Change, net of tax (250) $ 26 (567) $ 415
Balance, end of period 197,070 197,863 197,070 197,863
Benefit plans        
Change in accumulated other comprehensive income (loss)        
Balance, beginning of period (6,574) (5,794) (6,257) (6,183)
Balance, end of period $ (6,824) $ (5,768) $ (6,824) $ (5,768)