Equity Equity (Preferred Stock Dividends) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Dividends Payable [Line Items]
Dividends, Preferred Stock, Cash	$ 67	$ 66
Floating Rate Non-Cumulative Preferred Stock, Series A, par value $0.01
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 0.420	$ 0.361
Dividends, Preferred Stock, Cash	$ 10	$ 9
Series D Preferred Stock
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 29.375	$ 29.375
Dividends, Preferred Stock, Cash	$ 15	$ 15
Series E Preferred Stock
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 351.563	$ 351.563
Dividends, Preferred Stock, Cash	$ 11	$ 11
Series F Preferred Stock [Member]
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 296.875	$ 296.875
Dividends, Preferred Stock, Cash	$ 12	$ 12
Series G Preferred Stock
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 19.250	$ 19.250
Dividends, Preferred Stock, Cash	$ 19	$ 19