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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Derivative [Line Items] |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | $ 16 | $ 29 | $ 183
Mortgage Income [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | (136) | (64) | 111
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 | (118) | (45) | 83
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 | (14) | (32) | 30
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 | (4) | 13 | (2)
Capital markets income [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | 152 | 93 | 72
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 | 108 | 46 | 21
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 | 23 | 28 | 36
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 | 10 | 15 | 14
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 | $ 11 | $ 4 | $ 1

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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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