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Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 160,576 | $ 151,907
Estimated Fair Value, Gain | 2,105 | 2,609
Estimated Fair Value, Loss | 2,691 | 3,378
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements | 2,029 | 2,504
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements | 1,560 | 1,925
Derivative Asset | 76 | 105
Derivative Liability | 1,131 | 1,453
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 243 | 185
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 43 | 90
Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 34,525 | 32,023
Estimated Fair Value, Gain | 65 | 20
Estimated Fair Value, Loss | 714 | 826
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 126,051 | 119,884
Estimated Fair Value, Gain | 2,040 | 2,589
Estimated Fair Value, Loss | 1,977 | 2,552
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 99,892 | 94,220
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Gain | 1,769 | 2,315
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Loss | 1,718 | 2,335
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 13,497 | 12,506
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Gain | 66 | 94
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Loss | 57 | 85
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 655 | 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 | 12 | 5
Other Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 12,007 | 12,173
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Estimated Fair Value, Gain | 198 | 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 | 2,975 | 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 | 121 | 158
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 31,550 | 30,600
Estimated Fair Value, Gain | 64 | 19
Estimated Fair Value, Loss | 593 | 668
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 29,550 | 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 | 43 | 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 | 580 | 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 | 21 | 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 | $ 13 | $ 0

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