Indebtedness - Fair Value (Details) $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fixed rate mortgages and unsecured indebtedness | Book value
Fair Value of Debt
Fair value of consolidated fixed rate mortgages and unsecured indebtedness	$ 25,600.0	$ 22,600.0
Fixed rate mortgages and unsecured indebtedness | Fair value
Fair Value of Debt
Fair value of consolidated fixed rate mortgages and unsecured indebtedness	$ 24,248.0	$ 20,020.0
Discount Rate | Weighted average | Fixed rate mortgages
Fair Value of Debt
Debt percentage- measurement input	0.0610	0.0610
Discount Rate | Weighted average | Unsecured Debt
Fair Value of Debt
Debt percentage- measurement input	0.0610	0.0587