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Summary of Significant Accounting Policies - Computation of Weighted Average Basic and Diluted Shares Outstanding (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net loss attributable to Company	$ 12	$ 1	$ 24	$ (68)	$ (14)	$ (26)	$ (75)	$ (122)	$ (31)	$ (237)	$ (2,412)
Denominator:
Basic—weighted average common shares outstanding									378	377	376
Dilutive effect of employee stock options and other unvested stock awards									0	0	0
Diluted outstanding shares									378	377	376
Basic loss attributable to Company per share	$ 0.03	$ 0.00	$ 0.06	$ (0.18)	$ (0.04)	$ (0.07)	$ (0.20)	$ (0.32)	$ (0.08)	$ (0.63)	$ (6.41)
Diluted loss attributable to Company per share	0.03	0.00	0.06	(0.18)	(0.04)	(0.07)	(0.20)	(0.32)	(0.08)	(0.63)	(6.41)
Cash dividends per share	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.20	$ 0.20	$ 0.61

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