Acquisitions and Dispositions - Dispositions (Details) - Subsequent Event - St.Regis New York - Disposal Group, Disposed of by Sale, Not Discontinued Operations $ in Millions	Dec. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal consideration	$ 310
Disposal assets	$ 211

Amount classified as assets attributable to disposal group held for sale or disposed of.

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