Intangible Assets, Allocation of Goodwill to Operating Segments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 25,180	$ 26,392
Foreign currency translation	1	2
Transfers of goodwill		0
Divestitures		(104)
Goodwill, ending balance	25,181	26,290
Corporate [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	105	305
Foreign currency translation	0	0
Transfers of goodwill		932
Divestitures		(104)
Goodwill, ending balance	105	1,133
Consumer Banking and Lending [Member] | Operating Segments [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	16,418	16,418
Foreign currency translation	0	0
Transfers of goodwill		0
Divestitures		0
Goodwill, ending balance	16,418	16,418
Commercial Banking [Member] | Operating Segments [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	2,938	3,018
Foreign currency translation	1	2
Transfers of goodwill		0
Divestitures		0
Goodwill, ending balance	2,939	3,020
Corporate and Investment Banking [Member] | Operating Segments [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	5,375	5,375
Foreign currency translation	0	0
Transfers of goodwill		0
Divestitures		0
Goodwill, ending balance	5,375	5,375
Wealth and Investment Management [Member] | Operating Segments [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	344	1,276
Foreign currency translation	0	0
Transfers of goodwill		(932)
Divestitures		0
Goodwill, ending balance	$ 344	$ 344