Commitments and Contingencies - Guarantees (Details) In Millions, unless otherwise specified	3 Months Ended																											3 Months Ended
	Mar. 31, 2015	Mar. 31, 2015 Lease Obligations and Debt Securities Payable USD ($)	Mar. 31, 2015 Property Lease Guarantee ExecuStay USD ($)	Mar. 31, 2015 Primary Obligor USD ($)	Mar. 31, 2015 Primary Obligor Debt service USD ($)	Mar. 31, 2015 Primary Obligor Operating profit USD ($)	Mar. 31, 2015 Primary Obligor Other guarantees USD ($)	Mar. 31, 2015 Primary Obligor Not Yet In Effect Condition Debt service USD ($)	Mar. 31, 2015 Primary Obligor Not Yet In Effect Condition Operating profit USD ($)	Mar. 31, 2015 Primary Obligor Not Yet In Effect Condition Other guarantees USD ($)	Mar. 31, 2015 Secondarily Liable USD ($)	Mar. 31, 2015 Secondarily Liable MVW Spin-off USD ($) guarantee	Mar. 31, 2015 Secondarily Liable MVW Spin-off Expiration in 2019 USD ($)	Mar. 31, 2015 Secondarily Liable MVW Spin-off Expiration in 2022 USD ($)	Mar. 31, 2015 Secondarily Liable MVW Spin-off Expiration in 2022 SGD	Mar. 31, 2015 Secondarily Liable Property Lease Guarantee Sunrise Senior Living Inc USD ($)	Dec. 30, 2011 Secondarily Liable Property Lease Guarantee Sunrise Senior Living Inc USD ($)	Mar. 31, 2015 Secondarily Liable Property Lease Guarantee Sunrise Senior Living Inc Key Bank Letter of Credit USD ($)	Dec. 30, 2011 Secondarily Liable Property Lease Guarantee Sunrise Senior Living Inc Key Bank Letter of Credit USD ($)	Mar. 31, 2015 Secondarily Liable Property Lease Guarantee Renaissance Hotel Group N.V. USD ($)	Mar. 31, 2015 Secondarily Liable Property Lease Guarantee Renaissance Hotel Group N.V. EUR (€)	Sep. 09, 2005 Secondarily Liable Property Lease Guarantee Renaissance Hotel Group N.V. EUR (€)	Mar. 31, 2015 Secondarily Liable Debt Securities Payable USD ($)	Mar. 31, 2015 Secondarily Liable Debt Securities Payable Sunrise Senior Living Inc USD ($)	Mar. 31, 2015 Secondarily Liable Debt Securities Payable CNL Retirement Properties Inc USD ($)	Mar. 31, 2015 Secondarily Liable Lease is Terminated by End of 2019 Property Lease Guarantee ExecuStay USD ($)	Mar. 31, 2015 New York City EDITION Hotel Primary Obligor Debt service USD ($)	Mar. 31, 2015 New York City EDITION Hotel Primary Obligor Other guarantees	Mar. 31, 2015 Other Current Liabilities Primary Obligor USD ($)	Mar. 31, 2015 Other Noncurrent Liabilities Primary Obligor USD ($)
Commitments and Contingencies Disclosure [Line Items]
Funding guarantees, minimum term	4 years
Funding guarantees, maximum term	10 years
Maximum potential amount of future fundings				$ 140	$ 49	$ 78	$ 13	$ 13	$ 20	$ 1	$ 75	$ 11	$ 4	$ 7	10	$ 56							$ 19	$ 3	$ 16	$ 6	$ 315
Guarantor obligations, number of guarantees												2
Liability for guarantees				57	14	42	1																						6	51
Guarantee obligations, carrying value		3	1									1
Guarantor obligations, term																												2 years
Guarantor obligations, extended term																												3 years
Guarantee obligations, cash collateralized																	1			3	2	35
Letter of credit provided by Sunrise, amount available																			85
Letter of credit provided by Sunrise, amount available at period end																		65
Collateral for continuing lease obligation contingency, future minimum annual payments due from 2014 until 2018																	1
Annual rent payments, approximately																				5
Remaining rent payments, approximately																				$ 22