Other Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Liabilities [Line Items]
Other Liabilities, non-current	$ 2,168	$ 2,379
Asset Retirement Obligation, Accretion Expense	20	18	$ 15
Estimated Future Undiscounted Cash Flows Expected To Be Paid Relating To Asset Retirement Obligations	1,000
Amortization of Below Market Tenant Lease	54	58	$ 65
Below Market Lease, Amortization Income, Year Four	33
Below Market Lease, Amortization Income, after Year Five	25
Accrued Payroll and Other Compensation	192
Below Market Lease, Amortization Income, Year One	49
Below-market tenant leases - amortization income - year 2	45
Below Market Lease, Amortization Income, Year Three	41
Deferred rental revenues [Domain]
Other Liabilities [Line Items]
Other Liabilities, non-current	1,568	1,707
Deferred credits, net [Member]
Other Liabilities [Line Items]
Other Liabilities, non-current	311	375
Asset retirement obligation [Member]
Other Liabilities [Line Items]
Other Liabilities, non-current	269	259
Deferred tax liability, noncurrent [Member]
Other Liabilities [Line Items]
Other Liabilities, non-current	14	11
Other long-term liabilities[Member]
Other Liabilities [Line Items]
Other Liabilities, non-current	$ 6	$ 27