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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
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Mar. 31, 2024 | Mar. 31, 2023
Derivative [Line Items] |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | $ 28 | $ (8)
Mortgage Income [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | (4) | 9
Mortgage Income [Member] | Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | (15) | 7
Mortgage Income [Member] | Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | 1 | 3
Mortgage Income [Member] | Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | 10 | (1)
Capital markets income [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | 32 | (17)
Capital markets income [Member] | Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | 9 | (28)
Capital markets income [Member] | Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | 9 | 9
Capital markets income [Member] | Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | 8 | 4
Capital markets income [Member] | Other Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | $ 6 | $ (2)

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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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- 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 + Details
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