Total Equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Preferred Stock Dividends
Preferred stock dividends	$ 468	$ 496	$ 524
Common Stock Dividends
Common stock dividend declared (in dollars per share)	$ 2.10	$ 1.40	$ 1.30
Common stock dividends	$ 3,818	$ 2,295	$ 2,161
Series A
Preferred Stock Dividends
Preferred stock dividend declared (in dollars per share)	$ 1,022	$ 1,017	$ 1,014
Preferred stock dividends	$ 44	$ 44	$ 44
Series C
Preferred Stock Dividends
Preferred stock dividend declared (in dollars per share)	$ 100	$ 100	$ 100
Preferred stock dividends	$ 52	$ 52	$ 52
Series E
Preferred Stock Dividends
Preferred stock dividend declared (in dollars per share)	$ 1,781	$ 1,781	$ 1,781
Preferred stock dividends	$ 60	$ 60	$ 60
Series F
Preferred Stock Dividends
Preferred stock dividend declared (in dollars per share)	$ 1,719	$ 1,719	$ 1,719
Preferred stock dividends	$ 60	$ 60	$ 60
Series G
Preferred Stock Dividends
Preferred stock dividend declared (in dollars per share)	$ 0	$ 0	$ 1,242
Preferred stock dividends	$ 0	$ 0	$ 24
Series H
Preferred Stock Dividends
Preferred stock dividend declared (in dollars per share)	$ 719	$ 1,143	$ 1,418
Preferred stock dividends	$ 38	$ 60	$ 74
Series I
Preferred Stock Dividends
Preferred stock dividend declared (in dollars per share)	$ 1,594	$ 1,594	$ 1,594
Preferred stock dividends	$ 64	$ 64	$ 64
Series J
Preferred Stock Dividends
Preferred stock dividend declared (in dollars per share)	$ 253	$ 1,213	$ 1,388
Preferred stock dividends	$ 15	$ 74	$ 84
Series K
Preferred Stock Dividends
Preferred stock dividend declared (in dollars per share)	$ 1,463	$ 1,463	$ 1,463
Preferred stock dividends	$ 59	$ 59	$ 59
Series L
Preferred Stock Dividends
Preferred stock dividend declared (in dollars per share)	$ 1,219	$ 1,219	$ 169
Preferred stock dividends	$ 24	$ 23	$ 3
Series M
Preferred Stock Dividends
Preferred stock dividend declared (in dollars per share)	$ 59	$ 0	$ 0
Preferred stock dividends	$ 24	$ 0	$ 0
Series N
Preferred Stock Dividends
Preferred stock dividend declared (in dollars per share)	$ 5,300	$ 0	$ 0
Preferred stock dividends	$ 16	$ 0	$ 0
Series O
Preferred Stock Dividends
Preferred stock dividend declared (in dollars per share)	$ 236	$ 0	$ 0
Preferred stock dividends	$ 12	$ 0	$ 0