Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Basic and diluted:
Net income		$ 10,129	$ 8,374	$ 7,514
Preferred dividends		(58)	(58)	(57)
Net income available to common shareholders		10,071	8,316	7,457
Earnings allocated to participating share awards		(76)	(64)	(57)
Net income attributable to common shareholders		$ 9,995	$ 8,252	$ 7,400
Denominator:
Basic: Weighted-average common stock (in shares)		712,000	735,000	751,000
Add: Weighted-average stock options (in shares)		1,000	1,000	1,000
Diluted (in shares)		713,000	736,000	752,000
Basic EPS (in dollars per share)	[1]	$ 14.04	$ 11.23	$ 9.86
Diluted EPS (in dollars per share)	[1]	$ 14.01	$ 11.21	$ 9.85
Stock Option
Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)		50	1,380	390

[1] Represents net income less (i) earnings allocated to participating share awards of $76 million, $64 million and $57 million for the years ended December 31, 2024, 2023 and 2022, respectively, and (ii) dividends on preferred shares of $58 million, $58 million and $57 million for the years ended December 31, 2024, 2023 and 2022, respectively.