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Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 160,792 | $ 151,907
Estimated Fair Value, Gain | 2,979 | 2,609
Estimated Fair Value, Loss | 4,226 | 3,378
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements | 2,924 | 2,504
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements | 2,490 | 1,925
Derivative Asset | 55 | 105
Derivative Liability | 1,736 | 1,453
Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 32,823 | 32,023
Estimated Fair Value, Gain | 27 | 20
Estimated Fair Value, Loss | 1,307 | 826
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 127,969 | 119,884
Estimated Fair Value, Gain | 2,952 | 2,589
Estimated Fair Value, Loss | 2,919 | 2,552
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 103,527 | 94,220
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Gain | 2,716 | 2,315
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Loss | 2,709 | 2,335
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 11,979 | 12,506
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Gain | 84 | 94
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Loss | 73 | 85
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 591 | 985
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Gain | 8 | 8
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Loss | 7 | 5
Other Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 11,872 | 12,173
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Gain | 144 | 172
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Loss | 130 | 127
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,523 | 1,423
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Gain | 1 | 1
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Loss | 154 | 158
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 31,300 | 30,600
Estimated Fair Value, Gain | 26 | 19
Estimated Fair Value, Loss | 1,153 | 668
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 29,300 | 30,600
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Gain | 11 | 19
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Loss | 1,133 | 668
Cash Flow Hedging [Member] | Interest Rate Options [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,000 | 0
Cash Flow Hedging [Member] | Interest Rate Options [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Gain | 15 | 0
Cash Flow Hedging [Member] | Interest Rate Options [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Loss | $ 20 | $ 0

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