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Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 157,276 | $ 151,907
Estimated Fair Value, Gain | 2,346 | 2,609
Estimated Fair Value, Loss | 2,852 | 3,378
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements | 2,249 | 2,504
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements | 1,646 | 1,925
Derivative Asset | 97 | 105
Derivative Liability | 1,206 | 1,453
Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 30,723 | 32,023
Estimated Fair Value, Gain | 98 | 20
Estimated Fair Value, Loss | 628 | 826
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 126,553 | 119,884
Estimated Fair Value, Gain | 2,248 | 2,589
Estimated Fair Value, Loss | 2,224 | 2,552
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 102,385 | 94,220
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Gain | 1,961 | 2,315
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Loss | 1,960 | 2,335
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 11,417 | 12,506
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Gain | 83 | 94
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Loss | 68 | 85
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 912 | 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 | 7 | 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 | 6 | 5
Other Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 11,839 | 12,173
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Gain | 197 | 172
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Loss | 190 | 127
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,423 | 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 | 0 | 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 | 136 | 158
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 29,300 | 30,600
Estimated Fair Value, Gain | 98 | 19
Estimated Fair Value, Loss | 492 | 668
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 27,800 | 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 | 75 | 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 | 473 | 668
Cash Flow Hedging [Member] | Interest Rate Options [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,500 | 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 | 23 | 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 | $ 19 | $ 0

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