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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

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- 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 + Details
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