Preferred Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Preferred stock issuance	$ 145	$ 144
Carrying Amount	520		$ 520	$ 470
Liquidation Amount	538		$ 538
Call of preferred stock	$ 100
Preferred stock, shares issued (in shares)	26,750		26,750	26,250
Noncontrolling interest	$ 295		$ 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%		4.70%
Carrying Amount	$ 145		$ 145	0
Liquidation Amount	150		$ 150
Series A
Class of Stock [Line Items]
Annual Dividend Rate			6.20%
Carrying Amount	0		$ 0	95
Liquidation Amount	0		0
Series A | Other Liabilities
Class of Stock [Line Items]
Liquidation Amount	$ 100		$ 100
Preferred Class A
Class of Stock [Line Items]
Annual Dividend Rate			3.75%
Preferred stock, shares issued (in shares)	300,000		300,000
Preferred stock, liquidation preference per share (in dollars per share)	$ 1,000		$ 1,000
Noncontrolling interest	$ 295		$ 295	$ 295
Preferred Class A | LIBOR
Class of Stock [Line Items]
Basis spread on variable rate			0.85%