Goodwill, Mortgage Servicing Rights, and Other Intangible Assets - Key Economic Assumptions (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2025	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Weighted-average prepayment speed assumption (constant prepayment rate)	6.74%	6.19%
Impact on fair value of 10% adverse change	$ (181)	$ (209)
Impact on fair value of 20% adverse change	$ (353)	$ (406)
Weighted-average option adjusted spread	6.15%	5.97%
Impact on fair value of a 100 basis point adverse change	$ (392)	$ (391)
Impact on fair value of a 200 basis point adverse change	$ (754)	$ (751)

Weighted-average option adjusted spread.

No definition available.

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- Definition

Impact on fair value of 100 basis points adverse change in the weighted-average option adjusted spread.

+ References

No definition available.

+ Details

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- Definition

Impact on fair value of 200 basis points adverse change in the weighted-average option adjusted spread.

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

The hypothetical financial impact of a 10 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4

+ Details

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- Definition

The hypothetical financial impact of a 20 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

+ References

+ Details

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- Definition

A specified percentage variance in the prepayment speed assumption in the determination of fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities).

+ References

+ Details

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