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Servicing of Financial Assets (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Amount	$ 1,007	$ 906
Residential Mortgage
Servicing Assets at Fair Value [Line Items]
Servicing related fees and other ancillary income	191	165	$ 137
Servicing Asset at Fair Value, Amount	1,007	906	812	$ 418
Other contracts
Servicing Assets at Fair Value [Line Items]
Servicing related fees and other ancillary income	26	23	24
Servicing Asset at Fair Value, Amount	117	109	96
Commercial Real Estate
Servicing Assets at Fair Value [Line Items]
Servicing related fees and other ancillary income	24	22	19
Servicing Asset at Fair Value, Amount	$ 97	$ 81	$ 78	$ 62

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
-Name Accounting Standards Codification
-Section 50
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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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