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Equity - Accumulated Other Comprehensive Income/(Loss) (Net of Tax) (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 | $ 26 | $ (63) | $ (60)

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