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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, 2023 | Mar. 31, 2022
Derivative [Line Items] |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | $ (8) | $ 1
Mortgage Income [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | 9 | (40)
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 | 7 | (46)
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 | 3 | (10)
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 | (1) | 16
Capital markets income [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | (17) | 41
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 | (28) | 31
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 | 11
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 | 4 | (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 | $ (2) | $ 3

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + 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 No definition available. + Details
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