Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended				6 Months Ended
	Jul. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Jan. 31, 2023	Apr. 30, 2016	May 31, 2015	Feb. 28, 2014
Class of Stock [Line Items]
Preferred stock cash dividend		$ 37	$ 23	$ 35	$ 20	$ 60	$ 55
2023 Share Repurchase Program
Class of Stock [Line Items]
Amount of common stock authorized for repurchase								$ 4,500
Total common stock repurchased		$ 1,050
Series D Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)		$ 1,475		$ 1,475		$ 2,950	$ 2,950
Preferred stock cash dividend		$ 11		$ 11		$ 22	$ 22
Liquidation preference per share (USD per share)											$ 100,000
Series D Preferred Stock | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 1,475
Preferred stock cash dividend	$ 11
Series F Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)		$ 2,163		$ 1,130		$ 4,254	$ 2,080
Preferred stock cash dividend		$ 5		$ 3		$ 11	$ 5
Liquidation preference per share (USD per share)										$ 100,000
Series F Preferred Stock | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 2,338
Preferred stock cash dividend	$ 6
Series G Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)		$ 1,338		$ 1,338		$ 2,675	$ 2,676
Preferred stock cash dividend		$ 7		$ 7		$ 13	$ 14
Liquidation preference per share (USD per share)									$ 100,000
Series G Preferred Stock | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 1,338
Preferred stock cash dividend	$ 7
Series D Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)		$ 0.37		$ 0.37		$ 0.74	$ 0.74
Liquidation preference per share (USD per share)											$ 25
Series D Preferred Stock, Depository Share | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 0.37
Series F Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)		21.63		11.30		42.54	20.80
Liquidation preference per share (USD per share)										$ 1,000
Series F Preferred Stock, Depository Share | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	23.38
Series G Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)		$ 0.33		$ 0.33		$ 0.66	$ 0.66
Liquidation preference per share (USD per share)									$ 25
Series G Preferred Stock, Depository Share | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 0.33