Other Comprehensive Income (Loss) and Shareholders' Equity (Deficit) - Changes in Shareholders' Equity (Deficit) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period			$ (3,590)
Balance at beginning of period (in shares)			256.3
Net income	$ 70	$ 210	$ 536	$ 657
Other comprehensive income	4	(32)	27	(50)
Cash dividends ($0.85 per share)			(257)
Employee stock plan			$ 64
Employee stock plan (in shares)			1.8
Purchase of treasury stock			$ (225)
Purchase of treasury stock (in shares)			(3.7)
Starwood Combination			$ 9,286
Starwood Combination (in shares)			136.1
Balance at end of period	$ 5,841		$ 5,841
Balance at end of period (in shares)	390.5		390.5
Cash dividends (in USD per share)			$ 0.85
Additional Paid-in- Capital
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period			$ 2,821
Employee stock plan			26
Starwood Combination			2,893
Balance at end of period	$ 5,740		5,740
Retained Earnings
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period			4,878
Net income			536
Cash dividends ($0.85 per share)			(257)
Employee stock plan			(20)
Starwood Combination			1,238
Balance at end of period	6,375		6,375
Treasury Stock, at Cost
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period			(11,098)
Employee stock plan			58
Purchase of treasury stock			(225)
Starwood Combination			5,155
Balance at end of period	(6,110)		(6,110)
Accumulated Other Comprehensive Loss
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period			(196)	(70)
Other comprehensive income			27
Balance at end of period	(169)	$ (120)	(169)	$ (120)
Class A Common Stock
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period			5
Balance at end of period	$ 5		$ 5