Equity Equity (Preferred Stock Dividends) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Dividends Payable [Line Items]
Dividends, Preferred Stock, Cash	$ 29	$ 35	$ 92	$ 103
Floating Rate Non-Cumulative Preferred Stock, Series A, par value $0.01
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 0.256	$ 0.256	$ 0.506	$ 0.506
Dividends, Preferred Stock, Cash	$ 6	$ 6	$ 12	$ 12
Series C Preferred Stock
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 0	$ 9.606	$ 0	$ 19.085
Dividends, Preferred Stock, Cash	$ 0	$ 5	$ 0	$ 10
Series D Preferred Stock
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 0	$ 0	$ 29.375	$ 29.375
Dividends, Preferred Stock, Cash	$ 0	$ 0	$ 15	$ 15
Series E Preferred Stock
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 351.563	$ 351.563	$ 703.126	$ 703.126
Dividends, Preferred Stock, Cash	$ 11	$ 12	$ 22	$ 23
Series F Preferred Stock [Member]
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 296.875	$ 296.875	$ 593.750	$ 593.750
Dividends, Preferred Stock, Cash	$ 12	$ 12	$ 24	$ 24
Series G Preferred Stock
Dividends Payable [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 0	$ 0	$ 19.250	$ 19.785
Dividends, Preferred Stock, Cash	$ 0	$ 0	$ 19	$ 19