Acquisitions and Dispositions - Dispositions and Planned Dispositions (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Remaining Future Minimum Operating Lease Obligations Due
Assets held for sale	$ 285		$ 588
North American Full-Service Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash received from sale of property	169
Gain on sale of property	24
Disposal Group, Disposed of by Sale, Not Discontinued Operations | North American Full-Service Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash received from sale of property		$ 306
Disposal Group, Held-for-sale, Not Discontinued Operations
Remaining Future Minimum Operating Lease Obligations Due
Assets held for sale	$ 285
Disposal Group, Held-for-sale, Not Discontinued Operations | North American Full-Service Property
Remaining Future Minimum Operating Lease Obligations Due
2017 (remaining)		3
2018		4
2019		4
2020		4
2021		4
Thereafter		175
Total		$ 194