Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Jan. 31, 2023	Apr. 30, 2016	May 31, 2015	Feb. 28, 2014
Class of Stock [Line Items]
Preferred stock cash dividend	$ 23	$ 20
2023 Share Repurchase Program
Class of Stock [Line Items]
Amount of common stock authorized for repurchase			$ 4,500
Total common stock repurchased	$ 1,250
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
Liquidation preference per share (USD per share)						$ 100,000
Series F Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 2,092	$ 950
Preferred stock cash dividend	$ 5	$ 2
Liquidation preference per share (USD per share)					$ 100,000
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
Liquidation preference per share (USD per share)				$ 100,000
Series D Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 0.37	$ 0.37
Liquidation preference per share (USD per share)						$ 25
Series F Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	20.92	9.50
Liquidation preference per share (USD per share)					$ 1,000
Series G Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 0.33	$ 0.33
Liquidation preference per share (USD per share)				$ 25