Acquisitions and Dispositions- Starwood Acquisition (Details) $ / shares in Units, room in Millions, $ in Millions		9 Months Ended
	Sep. 23, 2016 USD ($) hotel brand country property room $ / shares shares	Sep. 30, 2016 USD ($) renewal_option
Business Acquisition [Line Items]
Number of properties | property	6,000
Number of rooms | room	1.1
Number of brands | brand	30
Number of countries | country	120
Starwood Hotels & Resorts Worldwide, Inc.
Business Acquisition [Line Items]
Payments to acquire businesses (in USD per share) | $ / shares	$ 21.00
Number of hotels acquired | hotel	15
Fair value of equity method investments acquired	$ 647
Difference between carrying value and underlying equity of equity method investment	$ 501
Initial lease terms		20 years
Integration costs		$ 54
Transaction and employee termination costs		$ 320
Starwood Hotels & Resorts Worldwide, Inc. | Vistana Agreement
Business Acquisition [Line Items]
Agreement term	80 years
Annual fixed license fee	$ 30
Starwood Hotels & Resorts Worldwide, Inc. | Minimum
Business Acquisition [Line Items]
Number of lease renewal terms | renewal_option		1
Lease renewal terms		5 years
Starwood Hotels & Resorts Worldwide, Inc. | Maximum
Business Acquisition [Line Items]
Lease renewal terms		10 years
Starwood Hotels & Resorts Worldwide, Inc. | Common Stock
Business Acquisition [Line Items]
Equity interests issuable per share owned by acquiree (in shares) | shares	0.80