Dispositions - Additional Information (Detail) $ in Millions		12 Months Ended
	Sep. 21, 2018 USD ($)	Dec. 31, 2020 USD ($) Hotel	Dec. 31, 2019 USD ($) Hotel	Dec. 31, 2018 USD ($) Hotel
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of hotels sold | Hotel		1	14	4
Gain on sale of assets		$ 148	$ 339	$ 279
Proceeds from sales of assets, net		281	1,192	1,605
Income tax provision		(220)	$ 30	150
Long Term Capital Gain
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income tax provision				$ 77
Phoenician Land Parcel
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain on sale of assets		59
Proceeds from sales of assets, net		83
Retail
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain on sale of assets	$ 386
Proceeds from sales of assets, net	442
Future real estate tax rebates liability	$ 35
Retail | United States | Long Term Capital Gain
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income tax provision		$ 16