Asset Dispositions and Impairments - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) Hotel	Mar. 31, 2015 USD ($)	May. 06, 2016 Hotel	Dec. 31, 2015 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from asset sales, net	$ 83
Deferred gains on dispositions of assets	1,412			$ 1,412
Gain on disposition of assets	$ 2
Gain related to sale of a minority partnership interest		$ 17
Long-term management agreements [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of wholly-owned hotels sold | Hotel	1
Proceeds from asset sales, net	$ 79
Long-term management agreements [Member] | Subsequent Event [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of foreign wholly-owned hotels expected to be sold | Hotel			2
One wholly-owned hotel [Member] | Long-term management agreements [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Deferred gains on dispositions of assets	$ 5