Derivative Financial Instruments - Narrative (Details) $ in Millions	1 Months Ended
	Apr. 30, 2021 USD ($) property	Mar. 31, 2021 USD ($) property derivativeHeld	Dec. 31, 2020 USD ($) property	Sep. 30, 2021 derivativeHeld	May 31, 2021 property
Derivative [Line Items]
Repayments of secured debt | $			$ 6
Number of interest rate derivatives | derivativeHeld				0
Mortgage Debt
Derivative [Line Items]
Repayments of secured debt | $	$ 64	$ 39
Number of assets classified as discontinued operations | property	2	2	1		6
Number of interest rate derivatives terminated | derivativeHeld		2