Revenue (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Revenue from Contract with Customer [Abstract]
Weighted Average Remaining Term Of Tenant Leases at the Tenant's Option	5 years
Operating Leases, Future Minimum Payments Receivable, 2020	$ 4,177	[1]
Operating Leases, Future Minimum Payments Receivable, 2021	3,986	[1]
Operating Leases, Future Minimum Payments Receivable, 2022	3,758	[1]
Operating Leases, Future Minimum Payments Receivable, 2023	3,141	[1]
Operating Leases, Future Minimum Payments Receivable, in 2024	2,405	[1]
Operating Leases, Future Minimum Payments Receivable, Thereafter	6,908	[1]
Operating Leases, Future Minimum Payments Receivable	$ 24,375	[1]

[1] Based on the nature of the contract, tenant contracts are accounted for pursuant to relevant lease accounting (ASC 842) or revenue accounting (ASC 606) guidance. Excludes amounts related to services, as those contracts generally have a duration of one year or less.