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RETIREMENT BENEFITS - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in accumulated other comprehensive income (loss)      
Balance, beginning of year $ 201,672 $ 226,143  
Actuarial assumptions changes and plan experience 1,288 (760) $ (854)
Net asset (loss) gain due to difference between actual and expected returns (1,732) 625 400
Net amortization 214 229 232
Prior service (cost) credit (7) (4) 28
Curtailment/settlement gain 7 17 17
Foreign exchange impact and other 136 (93) 99
Change in deferred taxes, net 20 (13) 30
Change, net of tax [1] (74) (1,019) (48)
Balance, end of year 197,074 201,672 226,143
Benefit plans      
Change in accumulated other comprehensive income (loss)      
Balance, beginning of year (6,183) (5,164) (5,116)
Impact of Tax Reform 0 (1,020) 0
Balance, end of year $ (6,257) $ (6,183) $ (5,164)
[1] See Note 8 to the Consolidated Financial Statements.