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Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 35,334 $ 33,613 $ 32,433
Foreign currency translation adjustments [1] (213) 234 120
Balance 37,806 35,334 33,613
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (337) (571) (691)
Foreign currency translation adjustments [2] (213) 234 120
Balance $ (550) $ (337) $ (571)
[1]

Amount for 2021 includes a gain from a net investment hedge of $46 million (net of tax expense of $14 million). Amount for 2020 includes a loss from a net investment hedge of $54 million (net of tax benefit of $17 million). Amount for 2019 includes a gain from a net investment hedge of $11 million (net of tax expense of $3 million).
[2] Amount for 2021 includes a gain from a net investment hedge of $46 million (net of tax expense of $14 million). Amount for 2020 includes a loss from a net investment hedge of $54 million (net of tax benefit of $17 million). Amount for 2019 includes a gain from a net investment hedge of $11 million (net of tax expense of $3 million).