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RETIREMENT BENEFITS - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in accumulated other comprehensive income (loss)      
Balance, beginning of year $ 197,074 $ 201,672  
Change in deferred taxes, net 119 20 $ (13)
Change, net of tax [1] 552 74 1,019
Balance, end of year 193,946 197,074 201,672
Benefit plans      
Change in accumulated other comprehensive income (loss)      
Balance, beginning of year (6,257) (6,183) (5,164)
Actuarial assumptions changes and plan experience (2,300) 1,288 (760)
Net asset gain (loss) due to difference between actual and expected returns 1,427 (1,732) 625
Net amortization 274 214 229
Prior service (cost) credit (7) (7) (4)
Curtailment/settlement gain 1 7 17
Foreign exchange impact and other (66) 136 (93)
Impact of Tax Reform 0 0 (1,020)
Change in deferred taxes, net 119 20 (13)
Change, net of tax 552 74 1,019
Balance, end of year $ (6,809) $ (6,257) $ (6,183)
[1] See Note 8 to the Consolidated Financial Statements.