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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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Subsequent Events - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Subsequent Event [Line Items]
Expected loss on sale of disposal		$ 6	$ 1	$ 6	$ 63
Le Meridien San Francisco [Member]
Subsequent Event [Line Items]
Gross sale price of disposal		$ 222		$ 222
Subsequent Event [Member] \| Le Meridien San Francisco [Member]
Subsequent Event [Line Items]
Net book value of disposal	$ 219
Subsequent Event [Member] \| Le Meridien San Francisco [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Expected loss on sale of disposal	14
Subsequent Event [Member] \| Le Meridien San Francisco [Member] \| Minimum [Member]
Subsequent Event [Line Items]
Expected loss on sale of disposal	$ 13