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Servicing of Financial Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]
Residential mortgage servicing rights at fair value	$ 932		$ 932			$ 812
Residential Mortgage [Member]
Servicing Assets at Fair Value [Line Items]
Servicing related fees and other ancillary income	42	$ 40	119	$ 95
Residential mortgage servicing rights at fair value	932	809	932	809	$ 801	812	$ 770	$ 418
Fannie Mae DUS License [Member]
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Amortized Cost	85		85			81
Residential mortgage servicing rights at fair value	110		110			$ 96
Commercial Real Estate [Member]
Servicing Assets at Fair Value [Line Items]
Servicing related fees and other ancillary income	$ 5	$ 6	$ 17	$ 20

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

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
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-URI https://asc.fasb.org//1943274/2147481229/860-50-50-4

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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
-Topic 860
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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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