Acquisitions and Dispositions - Dispositions and Planned Dispositions (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale		$ 771	$ 78
Disposal Group, Held-for-sale, Not Discontinued Operations | Hotels Acquired Through Starwood Combination
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale		741
Accrued expenses and other		37
Disposal Group, Held-for-sale, Not Discontinued Operations | Miami Beach EDITION Residences
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale		30
Accrued expenses and other		$ 3
Disposal Group, Disposed of by Sale, Not Discontinued Operations | North American, plot of land
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash received from sale of land	$ 46