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Commitments and Contingencies - Off-Balance Sheet Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Residential mortgage
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	$ 137	$ 138
Maximum recourse exposure from mortgage loans sold with recourse liability	93	91
Indemnification, recourse, and repurchase reserves	18	18
CRE
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	9,217	9,421
Notional amount, maximum recourse exposure	2,782	2,786
Notional amount, maximum recourse exposure, recorded reserves	10	10
Other consumer
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	3,028	2,803
Notional amount, maximum recourse exposure	76	80
Commitments to extend, originate, or purchase credit and other commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	234,101	230,007
Letters of credit and financial guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Notional amount	$ 9,864	$ 9,347

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- Definition

Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability, Maximum Recourse Exposure

+ References

No definition available.

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- Definition

Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability, Maximum Recourse Exposure, Recorded Reserves

+ References

No definition available.

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 825
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478898/942-825-50-1

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 825
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478898/942-825-50-1

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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://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

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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://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

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