Shareholders' Equity - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended			3 Months Ended				6 Months Ended
	Jan. 31, 2024	Sep. 30, 2018	Apr. 30, 2016	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Class of Stock [Line Items]
Preferred stock cash dividend				$ 55	$ 34	$ 37	$ 23	$ 89	$ 60
Series D Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)				$ 0		$ 1,475		$ 1,475	$ 2,950
Preferred stock cash dividend				$ 0		$ 11		$ 11	$ 22
Series D Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)				$ 0		$ 0.37		$ 0.37	$ 0.74
Series F Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)				$ 0		$ 2,163		$ 2,336	$ 4,254
Preferred stock cash dividend				$ 0		$ 5		$ 6	$ 11
Series F Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)				$ 0		$ 21.63		$ 23.36	$ 42.54
Series G Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)				$ 1,338		$ 1,338		$ 2,675	$ 2,675
Preferred stock cash dividend				$ 6		$ 7		$ 13	$ 13
Ownership Interest Per Depositary Share			0.025%
Series G Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)				$ 0.33		$ 0.33		$ 0.67	$ 0.66
Series H Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)				$ 2,145		$ 2,813		$ 4,214	$ 2,813
Preferred stock cash dividend				$ 11		$ 14		$ 21	$ 14
Ownership Interest Per Depositary Share		1.00%
Series H Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)				$ 21.45		$ 28.13		$ 42.14	$ 28.13
Series I Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)				$ 2,513		$ 0		$ 2,513	$ 0
Preferred stock cash dividend				$ 38		$ 0		$ 38	$ 0
Ownership Interest Per Depositary Share	1.00%
Series I Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)				$ 25.13		$ 0		$ 25.13	$ 0
Ownership Interest Per Depositary Share	1.00%