Shareholders' Equity - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended
	Sep. 30, 2018	Apr. 30, 2016	Mar. 31, 2024	Mar. 31, 2023
Class of Stock [Line Items]
Preferred stock cash dividend			$ 34	$ 23
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, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)			$ 0.37	$ 0.37
Series F Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)			$ 2,336	$ 2,092
Preferred stock cash dividend			$ 6	$ 5
Series F Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)			$ 23.36	$ 20.92
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
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
Series H Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)			$ 2,069	$ 0
Preferred stock cash dividend			$ 10	$ 0
Ownership Interest Per Depositary Share	1.00%
Series H Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)			$ 20.69	$ 0