Securitizations and Variable Interest Entities, Sold or Securitized Loans Serviced for Others (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	$ 75,847		$ 76,230
Delinquent loans and foreclosed assets	1,597		1,413
Net charge-offs	19	$ 7
Conforming mortgage loan securitization [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	693,200		704,500
Delinquent loans and foreclosed assets	3,600		4,600
Total Commercial [Member] \| Commercial mortgage [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	66,844		67,029
Delinquent loans and foreclosed assets	1,140		912
Net charge-offs	14	4
Securitizations and Variable Interest Entities Textual [Abstract]
Foreclosed assets	290		274
Total Consumer [Member] \| Residential mortgage [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	9,003		9,201
Delinquent loans and foreclosed assets	457		501
Net charge-offs	5	$ 3
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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5162-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4437-111522

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (e)(5)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

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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

No definition available.

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- Definition

Securitizations and Variable Interest Entities Textual Abstract.

+ References

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