Preferred Stock - Non-Cumulative Perpetual Preferred Stock (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)	26,750
Liquidation Amount	$ 538
Carrying Amount	$ 520	$ 470
Beginning on or after August 1, 2025 | LIBOR
Class of Stock [Line Items]
Basis spread on variable rate	4.262%
Beginning on or after May 1, 2026 | LIBOR
Class of Stock [Line Items]
Basis spread on variable rate	4.92%
Beginning on or after May 1, 2024 | LIBOR
Class of Stock [Line Items]
Basis spread on variable rate	3.859%
Series A
Class of Stock [Line Items]
Annual Dividend Rate	6.20%
Preferred stock, shares outstanding (in shares)	0
Liquidation Amount	$ 0
Carrying Amount	$ 0	95
Series B
Class of Stock [Line Items]
Annual Dividend Rate	6.625%
Preferred stock, shares outstanding (in shares)	8,000
Liquidation Amount	$ 80
Carrying Amount	$ 77	77
Series C
Class of Stock [Line Items]
Annual Dividend Rate	6.60%
Preferred stock, shares outstanding (in shares)	5,750
Liquidation Amount	$ 58
Carrying Amount	$ 59	59
Series D
Class of Stock [Line Items]
Annual Dividend Rate	6.10%
Preferred stock, shares outstanding (in shares)	10,000
Liquidation Amount	$ 100
Carrying Amount	$ 94	94
Series E
Class of Stock [Line Items]
Annual Dividend Rate	6.50%
Preferred stock, shares outstanding (in shares)	1,500
Liquidation Amount	$ 150
Carrying Amount	$ 145	145
Series F
Class of Stock [Line Items]
Annual Dividend Rate	4.70%
Preferred stock, shares outstanding (in shares)	1,500
Liquidation Amount	$ 150
Carrying Amount	$ 145	$ 0