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RETIREMENT BENEFITS - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Change in accumulated other comprehensive income (loss)        
Balance, beginning of period     $ 197,074  
Actuarial assumptions changes and plan experience $ (814)   (1,609)  
Net asset gain (loss) due to difference between actual and expected returns 443   1,133  
Net amortization 66   128  
Prior service cost (5)   (5)  
Curtailment/settlement gain 2   2  
Foreign exchange impact and other (22)   (47)  
Change in deferred taxes, net 77   81  
Change, net of tax (253) $ 301 (317) $ 389
Balance, end of period 198,110 200,968 198,110 200,968
Benefit plans        
Change in accumulated other comprehensive income (loss)        
Balance, beginning of period (6,321) (6,095) (6,257) (6,183)
Balance, end of period $ (6,574) $ (5,794) $ (6,574) $ (5,794)