Securitizations and Variable Interest Entities, Sold or Securitized Loans Serviced for Others (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	$ 74,823		$ 76,230
Delinquent loans and foreclosed assets	1,314		1,413
Net charge-offs	101	$ 37
Conforming mortgage loan securitization [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	621,100		704,500
Delinquent loans and foreclosed assets	3,400		4,600
Total Commercial [Member] \| Commercial mortgage [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	66,232		67,029
Delinquent loans and foreclosed assets	899		912
Net charge-offs	89	24
Securitizations and Variable Interest Entities Textual [Abstract]
Foreclosed assets	184		274
Total Consumer [Member] \| Residential mortgage [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	8,591		9,201
Delinquent loans and foreclosed assets	415		501
Net charge-offs	12	$ 13
Securitizations and Variable Interest Entities Textual [Abstract]
Foreclosed assets	$ 29		$ 25

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481326/860-20-50-4

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- Definition

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11

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- References

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- Definition

Amount of credit loss after recoveries for transferred financial assets that continue to be recognized in the statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (e)(5)
-SubTopic 20
-Topic 860
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481326/860-20-50-4

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- Definition

Includes off balance-sheet amounts sold or securitized for both the principal amount of loans (across all types of loans) that are overdue in payment by a set number of days, and the carrying amount of assets obtained through foreclosure proceedings.

+ References

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- Definition

Securitizations and Variable Interest Entities Textual Abstract.

+ References

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