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Acquisitions and Dispositions- Starwood Fair Value and Estimated Useful Lives of Identifiable Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 23, 2016
Jun. 30, 2017
Business Acquisition [Line Items]    
Guarantee to provide operating support, maximum   $ 263
Starwood Hotels & Resorts Worldwide, Inc.    
Business Acquisition [Line Items]    
Identified intangible assets $ 7,298  
Sheraton Grand Chicago Hotel    
Business Acquisition [Line Items]    
Contingent purchase obligation 300  
Guarantee to provide operating support, maximum 65  
Management agreements and lease contract intangibles | Starwood Hotels & Resorts Worldwide, Inc.    
Business Acquisition [Line Items]    
Estimated fair value, finite-lived intangible assets 754  
Franchise agreements | Starwood Hotels & Resorts Worldwide, Inc.    
Business Acquisition [Line Items]    
Estimated fair value, finite-lived intangible assets 755  
Loyalty program marketing rights | Starwood Hotels & Resorts Worldwide, Inc.    
Business Acquisition [Line Items]    
Estimated fair value, finite-lived intangible assets $ 77  
Estimated Useful Life (in years) 30 years  
Brands | Starwood Hotels & Resorts Worldwide, Inc.    
Business Acquisition [Line Items]    
Estimated fair value, indefinite-lived intangible assets $ 5,712  
Minimum | Management agreements and lease contract intangibles | Starwood Hotels & Resorts Worldwide, Inc.    
Business Acquisition [Line Items]    
Estimated Useful Life (in years) 10 years  
Minimum | Franchise agreements | Starwood Hotels & Resorts Worldwide, Inc.    
Business Acquisition [Line Items]    
Estimated Useful Life (in years) 10 years  
Maximum | Management agreements and lease contract intangibles | Starwood Hotels & Resorts Worldwide, Inc.    
Business Acquisition [Line Items]    
Estimated Useful Life (in years) 25 years  
Maximum | Franchise agreements | Starwood Hotels & Resorts Worldwide, Inc.    
Business Acquisition [Line Items]    
Estimated Useful Life (in years) 80 years