Intangible Assets and Other Assets, Goodwill (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Goodwill Table
Goodwill, beginning balance	$ 25,175
Foreign currency translation	(2)
Goodwill, ending balance	25,173
Customer relationship and other amortized intangibles [Member]
Intangible Assets and Other Assets Textual [Abstract]
Net carry value	85	$ 118
Corporate [Member]
Goodwill Table
Goodwill, beginning balance	105
Foreign currency translation	0
Goodwill, ending balance	105
Consumer Banking and Lending [Member] | Operating Segments [Member]
Goodwill Table
Goodwill, beginning balance	16,418
Foreign currency translation	0
Goodwill, ending balance	16,418
Commercial Banking [Member] | Operating Segments [Member]
Goodwill Table
Goodwill, beginning balance	2,933
Foreign currency translation	(2)
Goodwill, ending balance	2,931
Corporate and Investment Banking [Member] | Operating Segments [Member]
Goodwill Table
Goodwill, beginning balance	5,375
Foreign currency translation	0
Goodwill, ending balance	5,375
Wealth and Investment Management [Member] | Operating Segments [Member]
Goodwill Table
Goodwill, beginning balance	344
Foreign currency translation	0
Goodwill, ending balance	$ 344