Commitments and Contingencies - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) LegalMatter	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Reserve for legal contingencies | $	$ 48	$ 46
Litigation relating to occupancy tax
Loss Contingencies [Line Items]
Number of lawsuits filed by cities, counties and states involving hotel occupancy taxes	101
Number of lawsuits currently active	10
Number of lawsuits dismissed to date	47
Dismissal based in finding not subject to tax	33
City of San Francisco
Loss Contingencies [Line Items]
Occupancy and other tax assessment refund received | $		78
Occupancy and other tax assessment refund received, interest | $		$ 19