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Goodwill and Other Intangible Assets - Goodwill Business Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 15,065	$ 14,777	$ 14,782
Acquisitions		273
Other adjustments	(6)	15	(5)
Goodwill, ending balance	15,059	15,065	14,777
Credit Card
Goodwill [Roll Forward]
Goodwill, beginning balance	5,366	5,078	5,087
Acquisitions		273
Other adjustments	(6)	15	(9)
Goodwill, ending balance	5,360	5,366	5,078
Consumer Banking
Goodwill [Roll Forward]
Goodwill, beginning balance	4,645	4,645	4,645
Acquisitions		0
Other adjustments	0	0	0
Goodwill, ending balance	4,645	4,645	4,645
Commercial Banking
Goodwill [Roll Forward]
Goodwill, beginning balance	5,054	5,054	5,050
Acquisitions		0
Other adjustments	0	0	4
Goodwill, ending balance	$ 5,054	$ 5,054	$ 5,054

X

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of increase (decrease) of asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized, classified as other.

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