Goodwill and Other Intangible Assets - Goodwill Business Segments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 15,065
Other adjustments	(3)
Goodwill, ending balance	15,062
Credit Card
Goodwill [Roll Forward]
Goodwill, beginning balance	5,366
Other adjustments	(3)
Goodwill, ending balance	5,363
Consumer Banking
Goodwill [Roll Forward]
Goodwill, beginning balance	4,645
Other adjustments	0
Goodwill, ending balance	4,645
Commercial Banking
Goodwill [Roll Forward]
Goodwill, beginning balance	5,054
Other adjustments	0
Goodwill, ending balance	$ 5,054