Acquisitions and Dispositions- Starwood Fair Value and Estimated Useful Lives of Identifiable Intangible Assets (Details) - Starwood Hotels & Resorts Worldwide, Inc. $ in Millions	Sep. 23, 2016 USD ($)
Business Acquisition [Line Items]
Identified intangible assets	$ 7,917
Management agreements
Business Acquisition [Line Items]
Estimated fair value, finite-lived intangible assets	672
Franchise agreements
Business Acquisition [Line Items]
Estimated fair value, finite-lived intangible assets	744
Loyalty program marketing rights
Business Acquisition [Line Items]
Estimated fair value, finite-lived intangible assets	$ 49
Estimated Useful Life (in years)	30 years
Brands
Business Acquisition [Line Items]
Estimated fair value, indefinite-lived intangible assets	$ 6,452
Minimum | Management agreements
Business Acquisition [Line Items]
Estimated Useful Life (in years)	10 years
Minimum | Franchise agreements
Business Acquisition [Line Items]
Estimated Useful Life (in years)	10 years
Maximum | Management agreements
Business Acquisition [Line Items]
Estimated Useful Life (in years)	25 years
Maximum | Franchise agreements
Business Acquisition [Line Items]
Estimated Useful Life (in years)	80 years