Intangible Assets, Allocation of Goodwill to Operating Segments (Details) $ in Millions	9 Months Ended
Sep. 30, 2021 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 26,392
Divestitures	(201)
Foreign currency translation	0
Transfers of goodwill	0
Goodwill, ending balance	26,191
Corporate [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	305
Divestitures	(201)
Foreign currency translation	0
Transfers of goodwill	1,012
Goodwill, ending balance	1,116
Consumer Banking and Lending [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	16,418
Divestitures	0
Foreign currency translation	0
Transfers of goodwill	0
Goodwill, ending balance	16,418
Commercial Banking [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	3,018
Divestitures	0
Foreign currency translation	0
Transfers of goodwill	(80)
Goodwill, ending balance	2,938
Corporate and Investment Banking [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	5,375
Divestitures	0
Foreign currency translation	0
Transfers of goodwill	0
Goodwill, ending balance	5,375
Wealth and Investment Management [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	1,276
Divestitures	0
Foreign currency translation	0
Transfers of goodwill	(932)
Goodwill, ending balance	$ 344

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 55
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