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Servicing of Financial Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Amount	$ 971		$ 971			$ 906
Residential Mortgage
Servicing Assets at Fair Value [Line Items]
Servicing related fees and other ancillary income	53	$ 42	143	$ 119
Servicing Asset at Fair Value, Amount	971	932	971	932	$ 1,020	906	$ 801	$ 812
Fannie Mae DUS License
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Amortized Cost	86		86			87
Servicing Asset at Fair Value, Amount	108		108			$ 109
Commercial Real Estate
Servicing Assets at Fair Value [Line Items]
Servicing related fees and other ancillary income	$ 6	$ 5	$ 19	$ 17

X

- Definition

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

+ References

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- Definition

Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

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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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