Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Basic and diluted:
Net income		$ 10,833	$ 10,129	$ 8,374
Preferred dividends		(58)	(58)	(58)
Net income available to common shareholders		10,775	10,071	8,316
Earnings allocated to participating share awards		(74)	(76)	(64)
Net income attributable to common shareholders		$ 10,701	$ 9,995	$ 8,252
Denominator:
Basic: Weighted-average common stock (in shares)		695,000	712,000	735,000
Add: Weighted-average stock options (in shares)		1,000	1,000	1,000
Diluted (in shares)		696,000	713,000	736,000
Basic EPS (in dollars per share)	[1]	$ 15.41	$ 14.04	$ 11.23
Diluted EPS (in dollars per share)	[1]	$ 15.38	$ 14.01	$ 11.21
Stock Option
Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)		160	50	1,380

[1] Represents net income less (i) earnings allocated to participating share awards of $74 million, $76 million and $64 million for the years ended December 31, 2025, 2024 and 2023, respectively, and (ii) dividends on preferred shares of $58 million for each of the years ended December 31, 2025, 2024 and 2023.