Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Basic and diluted:
Net income		$ 2,584	$ 2,437
Preferred dividends		(14)	(14)
Net income available to common shareholders		2,570	2,423
Earnings allocated to participating share awards		(18)	(18)
Net income attributable to common shareholders		$ 2,552	$ 2,405
Denominator:
Basic: Weighted-average common stock (in shares)		701.0	721.0
Add: Weighted-average stock options (in shares)		1.0	1.0
Diluted (in shares)		702.0	722.0
Basic EPS (in dollars per share)	[1]	$ 3.64	$ 3.34
Diluted EPS (in dollars per share)	[1]	$ 3.64	$ 3.33
Stock Option
Denominator:
The dilutive effect of securities excluded from the calculation of earnings per share (in shares)		0.1

[1] Represents net income less (i) earnings allocated to participating share awards of $18 million for both the three months ended March 31, 2025 and 2024, and (ii) dividends on preferred shares of $14 million for both the three months ended March 31, 2025 and 2024.