Preferred Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Preferred stock issuance	$ 145	$ 144
Carrying Amount	520	$ 470
Liquidation Amount	538
Call of preferred stock	$ 100
Preferred stock, shares issued (in shares)	26,750	26,250
Noncontrolling interest	$ 295	$ 295
Retained Earnings
Class of Stock [Line Items]
Call of preferred stock	5
Series F
Class of Stock [Line Items]
Preferred stock issuance	$ 150
Annual Dividend Rate	4.70%
Carrying Amount	$ 145	0
Liquidation Amount	$ 150
Series A
Class of Stock [Line Items]
Annual Dividend Rate	6.20%
Carrying Amount	$ 0	95
Liquidation Amount	0
Series A | Other Liabilities
Class of Stock [Line Items]
Liquidation Amount	$ 100
Preferred Class A
Class of Stock [Line Items]
Annual Dividend Rate	3.75%
Preferred stock, shares issued (in shares)	300,000
Liquidation preference per share (in dollars per share)	$ 1,000
Noncontrolling interest	$ 295	$ 295
Preferred Class A | LIBOR
Class of Stock [Line Items]
Basis spread on variable rate	0.85%
Preferred Class B | FT Real Estate Securities Company, Inc.
Class of Stock [Line Items]
Annual Dividend Rate	9.50%
Liquidation preference per share (in dollars per share)	$ 1,000,000
Stock issued (in shares)	50
Preferred Class B | Non Affiliates | FT Real Estate Securities Company, Inc.
Class of Stock [Line Items]
Stock issued (in shares)	47