Other Comprehensive (Loss) Income and Shareholders' (Deficit) Equity - Amounts Reclassified out of Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Gains and other income, net	$ 20	$ 3	$ 20	$ 3
Interest expense	(42)	(30)	(78)	(60)
Income before income taxes	355	285	662	516
Provision for income taxes	(115)	(93)	(215)	(152)
NET INCOME	240	$ 192	447	$ 364
Foreign Currency Translation Adjustments | Reclassification of Gains (Losses) from Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before income taxes	0		(3)
Provision for income taxes	0		0
NET INCOME	0		(3)
Derivative Instrument Adjustments | Reclassification of Gains (Losses) from Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before income taxes	1		6
Provision for income taxes	1		1
NET INCOME	2		7
Interest rate contracts | Derivative Instrument Adjustments | Reclassification of Gains (Losses) from Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest expense	(2)		(3)
Cash flow hedges | Derivative Instrument Adjustments | Reclassification of Gains (Losses) from Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Base management and franchise fees	3		6
Net investment hedging | Foreign Currency Translation Adjustments | Reclassification of Gains (Losses) from Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Gains and other income, net	0		(3)
Net investment hedging | Derivative Instrument Adjustments | Reclassification of Gains (Losses) from Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Gains and other income, net	$ 0		$ 3