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Servicing of Financial Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Amount	$ 976		$ 976			$ 1,007
Residential Mortgage
Servicing Assets at Fair Value [Line Items]
Servicing related fees and other ancillary income	47	$ 53	141	$ 143
Servicing Asset at Fair Value, Amount	976	971	976	971	$ 988	1,007	$ 1,020	$ 906
Commercial Real Estate
Servicing Assets at Fair Value [Line Items]
Servicing related fees and other ancillary income	6	6	19	18
Servicing Asset at Fair Value, Amount	91	87	91	87	$ 93	97	$ 90	$ 81
Other contracts
Servicing Assets at Fair Value [Line Items]
Servicing related fees and other ancillary income	7	$ 6	20	$ 19
Servicing Asset at Fair Value, Amount	$ 112		$ 112			$ 117

X

- Definition

Amount of contractually specified servicing fee, late fee, and ancillary fee recognized as income for servicing asset and servicing liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 50
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-Section 50
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-URI https://asc.fasb.org/1943274/2147481229/860-50-50-2

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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

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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.

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