Shareholders' Equity - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2022	Mar. 31, 2022	Mar. 31, 2021
Class of Stock [Line Items]
Preferred stock cash dividend		$ 20	$ 25
Series D Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)		$ 1,475	$ 1,475
Preferred stock cash dividend		$ 11	$ 11
Series D Preferred Stock | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 1,475
Preferred stock cash dividend	$ 11
Series D Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)		$ 0.37	$ 0.37
Series D Preferred Stock, Depository Share | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 0.37
Series F Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)		$ 950	$ 953
Preferred stock cash dividend		$ 2	$ 7
Series F Preferred Stock | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 1,130
Preferred stock cash dividend	$ 3
Series F Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)		$ 9.50	$ 9.53
Series F Preferred Stock, Depository Share | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 11.30
Series G Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)		$ 1,338	$ 1,338
Preferred stock cash dividend		$ 7	$ 7
Series G Preferred Stock | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 1,338
Preferred stock cash dividend	$ 7
Series G Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)		$ 0.33	$ 0.33
Series G Preferred Stock, Depository Share | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 0.33
Series H Preferred Stock | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 2,813
Preferred stock cash dividend	$ 14
Series H Preferred Stock, Depository Share | Forecast | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 28.13