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Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Accounting Standards Update 2016-01 [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Foreign currency translation attributable to non-controlling interests |  | $ 29
Foreign Currency Translation Adjustments Attributable to Non-controlling Interests [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Foreign currency translation attributable to non-controlling interests | $ 81 |

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