Indebtedness - Fair Value (Details) $ in Millions	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fixed rate mortgages and unsecured indebtedness | Book value
Fair Value of Debt
Fair value of consolidated fixed rate mortgages and unsecured indebtedness	$ 22,600	$ 23,300
Fixed rate mortgages and unsecured indebtedness | Fair value
Fair Value of Debt
Fair value of consolidated fixed rate mortgages and unsecured indebtedness	$ 20,020	$ 24,597
Discount Rate | Weighted average | Fixed rate mortgages
Fair Value of Debt
Debt percentage- measurement input	6.10	3.17
Discount Rate | Weighted average | Unsecured Debt
Fair Value of Debt
Debt percentage- measurement input	5.87	3.33