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Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 165,240 | $ 160,576
Derivative Asset, Estimated Fair Value | 1,640 | 2,105
Derivative Liability, Estimated Fair Value | 1,808 | 2,691
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements | 1,434 | 2,029
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements | 1,124 | 1,560
Derivative Asset | 206 | 76
Derivative Liability | 684 | 1,131
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 120 | 243
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 67 | 43
Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 39,234 | 34,525
Derivative Asset, Estimated Fair Value | 117 | 65
Derivative Liability, Estimated Fair Value | 398 | 714
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 126,006 | 126,051
Derivative Asset, Estimated Fair Value | 1,523 | 2,040
Derivative Liability, Estimated Fair Value | 1,410 | 1,977
Interest rate swaps | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 99,981 | 99,892
Interest rate swaps | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 1,330 | 1,769
Interest rate swaps | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 1,258 | 1,718
Interest rate options | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 12,151 | 13,497
Interest rate options | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 40 | 66
Interest rate options | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 27 | 57
Interest rate futures and forward commitments | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,376 | 655
Interest rate futures and forward commitments | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 7 | 7
Interest rate futures and forward commitments | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 2 | 12
Other contracts | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 12,497 | 12,007
Other contracts | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 146 | 198
Other contracts | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 123 | 190
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 4,934 | 2,975
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 4 | 1
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 85 | 121
Cash Flow Hedging | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 34,300 | 31,550
Derivative Asset, Estimated Fair Value | 113 | 64
Derivative Liability, Estimated Fair Value | 313 | 593
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 32,300 | 29,550
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 101 | 43
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 307 | 580
Cash Flow Hedging | Interest rate options | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,000 | 2,000
Cash Flow Hedging | Interest rate options | Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 12 | 21
Cash Flow Hedging | Interest rate options | Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | $ 6 | $ 13

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