v3.19.3.a.u2
Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 32,433 $ 31,848 $ 29,140
Foreign currency translation adjustments [1] 120 (253) 284
Balance 33,613 32,433 31,848
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (691) (432) (716)
Foreign currency translation adjustments [1] 120 (253) 284
Reclassification as a result of adoption of accounting guidance   (6)  
Balance $ (571) $ (691) $ (432)
[1] Amounts for 2019 and 2018 include gains from a net investment hedge of $11 million (net of tax expense of $3 million) and $30 million (net of tax expense of $10 million), respectively. Amount for 2017 includes a loss from a net investment hedge of $64 million (net of tax benefit of $38 million)