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Discontinued Operations - Schedule of Gain on Divestiture within Income from Discontinued Operations (Detail) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2015	Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Proceeds on disposal, net of transaction costs	$ 549
Net assets disposed	438
Pre-tax gain on divestiture	111
Income taxes	66
Gain on divestiture, net of tax	$ 45	$ 45

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Disposal group including discontinued operation value of net assets.

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Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

+ References

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