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Derivative Financial Instruments And Hedging Activities (Schedule Of Gains (Losses) Recognized Related To Derivatives Not Designated As Hedging Instruments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	$ 39	$ 62	$ 70	$ 103
Capital markets income [Member] | Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	37	34	56	91
Capital markets income [Member] | Interest rate swaps | Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	12	3	23	18
Capital markets income [Member] | Interest rate options | Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	10	15	31	38
Capital markets income [Member] | Interest rate futures and forward commitments | Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	4	4	12	18
Capital markets income [Member] | Other Contracts [Member] | Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	11	12	(10)	17
Mortgage Income [Member] | Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	2	28	14	12
Mortgage Income [Member] | Interest rate swaps | Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	0	26	12	3
Mortgage Income [Member] | Interest rate options | Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	(2)	(1)	(2)	(2)
Mortgage Income [Member] | Interest rate futures and forward commitments | Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	$ 4	$ 3	$ 4	$ 11

X

- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 182
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-182

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4CC
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-21

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- Definition

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-5

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