Loan Servicing - Commercial Mortgage Banking Activities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]
MSRs at fair value	$ 3,013	$ 2,633
CRE
Servicing Assets at Fair Value [Line Items]
UPB of CRE mortgages serviced for others	37,397	37,960
Mortgage loans sold with recourse	9,938	10,243
Maximum recourse exposure from CRE mortgages sold with recourse liability	2,861	2,958
Recorded reserves related to recourse exposure	15	16
CRE mortgages originated during the year-to-date period	1,557	9,380
MSRs at fair value	$ 280	$ 280

Represents the dollar amount of commercial real estate mortgage loans originated during the period.

No definition available.

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- Definition

Represents the total unpaid principal balance of commercial real estate mortgage loans serviced by the Registrant for others.

+ References

No definition available.

+ Details

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- Definition

The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

No definition available.

+ Details

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- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
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-Section 45
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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