Goodwill and Other Intangible Assets - Changes in Goodwill and Other Intangible Assets (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Goodwill and Other Intangible Assets [Roll Forward]
Amortizing Intangible Assets, Beginning Balance	$ 395
Amortizing Intangible Assets, Amortization expense	(43)
Amortizing Intangible Assets, Ending Balance	352
Goodwill, Beginning Balance	1,696
Goodwill, Ending Balance	1,696
Other Non-Amortizing Intangible Assets, Beginning Balance	148
Other Non-Amortizing Intangible Assets, Ending Balance	$ 148