Goodwill and Other Intangible Assets - Changes in Goodwill and Other Intangible Assets (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($)
Goodwill and Other Intangible Assets [Roll Forward]
Amortizing Intangible Assets, Beginning Balance	$ 636
Amortizing Intangible Assets, Amortization expense	(46)
Finite-Lived Intangible Assets, Period Increase (Decrease)	(152)
Amortizing Intangible Assets, Ending Balance	438
Goodwill, Beginning Balance	2,366
Goodwill, Period Increase (Decrease)	(673)
Goodwill, Ending Balance	1,693
Other Non-Amortizing Intangible Assets, Beginning Balance	2,514
Indefinite-lived Intangible Assets, Period Increase (Decrease)	(2,366)
Other Non-Amortizing Intangible Assets, Ending Balance	$ 148