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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	$ 62	$ (7)	$ 103	$ 5
Capital markets income [Member] | Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	34	36	91	47
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	3	16	18	(8)
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	15	14	38	35
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	2	18	10
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	12	4	17	10
Mortgage Income [Member] | Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	28	(43)	12	(42)
Mortgage Income [Member] | Interest rate swaps | Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	26	(38)	3	(38)
Mortgage Income [Member] | Interest rate options | Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	(1)	(1)	(2)	0
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	$ 3	$ (4)	$ 11	$ (4)

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4CC
-SubTopic 10
-Topic 815
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC

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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/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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