Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 88	$ 109	$ 323	$ 399
Other comprehensive income, net of taxes:
Foreign currency translation adjustments	(38)	(88)	(127)	(84)
Defined benefit pension and postretirement plans activity	1		2	1
Hedging activities	(1)	1	(3)	1
Total other comprehensive income (loss), net of taxes	(38)	(87)	(128)	(82)
Total comprehensive income	50	22	195	317
Comprehensive income attributable to Starwood	$ 50	$ 22	$ 195	$ 317