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Accumulated Other Comprehensive Income/(Loss) (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
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	$ 6	$ 83
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Opening balance reclassification	$ 5	$ (5)

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