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Net Income 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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator:
Net income (loss) attributable to Company	$ (217)	$ 289	$ (336)	$ 599
Denominator:
Basic-weighted average common shares outstanding	375	387	375	397
Dilutive effect of employee stock options and other unvested stock awards		1		1
Diluted outstanding shares	375	388	375	398
Basic	$ (0.58)	$ 0.75	$ (0.90)	$ 1.51
Diluted	(0.58)	0.74	(0.90)	1.51
Cash dividends per share	$ 0.05	$ 0.46	$ 0.51	$ 0.92

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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