Acquisitions and Dispositions- Starwood Allocation of Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Sep. 23, 2016	Jun. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 8,582	$ 7,598
Starwood Hotels & Resorts Worldwide, Inc.
Business Acquisition [Line Items]
Working capital	$ (207)
Working capital, Adjustments	(27)
Property and equipment, including assets held for sale	1,920
Property and equipment, including assets held for sale, Adjustments	(79)
Identified intangible assets	7,298
Identified intangible assets, Adjustments	(659)
Equity and cost method investments	573
Equity and cost method investments, Adjustments	(6)
Other noncurrent assets	200
Other noncurrent assets, Adjustments	(24)
Deferred income taxes, net	(1,524)
Deferred income taxes, net, Adjustments	(8)
Guest loyalty program	(1,638)
Guest loyalty program, Adjustments	(7)
Debt	(1,871)
Debt, Adjustments	0
Other noncurrent liabilities	(714)
Other noncurrent liabilities, Adjustments	(60)
Net assets acquired	4,037
Net assets acquired, Adjustments	(870)
Goodwill	7,644
Goodwill, Adjustments	870
Fair value of assets acquired and liabilities assumed, net	11,681
Fair value of assets acquired and liabilities assumed, net, Adjustments	0
As Previously Reported | Starwood Hotels & Resorts Worldwide, Inc.
Business Acquisition [Line Items]
Working capital	(180)
Property and equipment, including assets held for sale	1,999
Identified intangible assets	7,957
Equity and cost method investments	579
Other noncurrent assets	224
Deferred income taxes, net	(1,516)
Guest loyalty program	(1,631)
Debt	(1,871)
Other noncurrent liabilities	(654)
Net assets acquired	4,907
Goodwill	6,774
Fair value of assets acquired and liabilities assumed, net	$ 11,681