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Net Income (Loss) Attributable to Company Per Share - Computation of Weighted Average Basic and Diluted Shares Outstanding (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income (loss) attributable to Company	$ (5,389)	$ 24	$ (5,466)	$ (44)
Denominator:
Basic—weighted average common shares outstanding	382	378	381	377
Dilutive effect of employee stock options and other unvested stock awards		3
Diluted outstanding shares	382	381	381	377
Basic	$ (14.11)	$ 0.06	$ (14.35)	$ (0.12)
Diluted	(14.11)	0.06	(14.35)	(0.12)
Cash dividends per share	$ 0.05	$ 0.05	$ 0.10	$ 0.10

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