Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Basic and diluted:
Net income		$ 7,514	$ 8,060	$ 3,135
Preferred dividends		(57)	(71)	(79)
Equity-related adjustments		0	(16)	0
Net income available to common shareholders		7,457	7,973	3,056
Earnings allocated to participating share awards		(57)	(56)	(20)
Net income attributable to common shareholders		$ 7,400	$ 7,917	$ 3,036
Denominator:
Basic: Weighted-average common stock (in shares)		751,000	789,000	805,000
Add: Weighted-average stock options (in shares)		1,000	1,000	1,000
Diluted (in shares)		752,000	790,000	806,000
Basic EPS (in dollars per share)	[1]	$ 9.86	$ 10.04	$ 3.77
Diluted EPS (in dollars per share)	[1]	$ 9.85	$ 10.02	$ 3.77
Stock Option
Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)		390	10	530

[1] Represents net income less (i) earnings allocated to participating share awards of $57 million, $56 million and $20 million for the years ended December 31, 2022, 2021 and 2020, respectively, (ii) dividends on preferred shares of $57 million, $71 million and $79 million for the years ended December 31, 2022, 2021 and 2020, respectively, and (iii) equity-related adjustments of $16 million related to the redemption of preferred shares for the year ended December 31, 2021.