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Servicing of Financial Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Amount	$ 979		$ 1,007
Residential Mortgage
Servicing Assets at Fair Value [Line Items]
Servicing related fees and other ancillary income	47	$ 44
Servicing Asset at Fair Value, Amount	979	1,026	1,007	$ 906
Commercial Real Estate
Servicing Assets at Fair Value [Line Items]
Servicing related fees and other ancillary income	6	7
Servicing Asset at Fair Value, Amount	94	88	$ 97	$ 81
Other contracts
Servicing Assets at Fair Value [Line Items]
Servicing related fees and other ancillary income	7	5
Servicing Asset at Fair Value, Amount	$ 111	$ 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
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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.

+ References

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