Equity Equity (Preferred Stock Dividends) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Dividends Payable [Line Items]
Dividends, Preferred Stock, Cash	$ 67	$ 67	$ 168	$ 165
Floating Rate Non-Cumulative Preferred Stock, Series A, par value $0.01
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 0.417	$ 0.419	$ 1.267	$ 1.155
Dividends, Preferred Stock, Cash	$ 10	$ 9	$ 30	$ 27
Series D Preferred Stock
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 29.375	$ 29.375	$ 58.750	$ 58.750
Dividends, Preferred Stock, Cash	$ 14	$ 14	$ 29	$ 29
Series E Preferred Stock
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 351.563	$ 351.563	$ 1,054.689	$ 1,054.689
Dividends, Preferred Stock, Cash	$ 11	$ 12	$ 34	$ 34
Series F Preferred Stock [Member]
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 296.875	$ 296.875	$ 890.625	$ 890.625
Dividends, Preferred Stock, Cash	$ 12	$ 12	$ 36	$ 36
Series G Preferred Stock
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 19.250	$ 19.250	$ 38.500	$ 38.500
Dividends, Preferred Stock, Cash	$ 20	$ 20	$ 39	$ 39