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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 | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative [Line Items] |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | $ 87 | $ 26 | $ 16
Capital markets income [Member] | Not Designated as Hedging Instrument |  |  |
Derivative [Line Items] |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | 127 | 49 | 152
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 | 29 | (17) | 108
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 | 52 | 42 | 23
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 | 23 | 13 | 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 | 23 | 11 | 11
Mortgage Income [Member] | Not Designated as Hedging Instrument |  |  |
Derivative [Line Items] |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | (40) | (23) | (136)
Mortgage Income [Member] | Interest rate swaps | Not Designated as Hedging Instrument |  |  |
Derivative [Line Items] |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | (44) | (14) | (118)
Mortgage Income [Member] | Interest rate options | Not Designated as Hedging Instrument |  |  |
Derivative [Line Items] |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | (4) | 1 | (14)
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 | $ 8 | $ (10) | $ (4)

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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://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 + Details
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