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Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 161,027 | $ 160,576
Derivative Asset, Estimated Fair Value | 2,093 | 2,105
Derivative Liability, Estimated Fair Value | 2,936 | 2,691
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements | 2,014 | 2,029
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements | 1,785 | 1,560
Derivative Asset | 79 | 76
Derivative Liability | 1,151 | 1,131
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 166 | 243
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 63 | 43
Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 37,805 | 34,525
Derivative Asset, Estimated Fair Value | 16 | 65
Derivative Liability, Estimated Fair Value | 929 | 714
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 123,222 | 126,051
Derivative Asset, Estimated Fair Value | 2,077 | 2,040
Derivative Liability, Estimated Fair Value | 2,007 | 1,977
Interest rate swaps | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 97,687 | 99,892
Interest rate swaps | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 1,885 | 1,769
Interest rate swaps | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 1,850 | 1,718
Interest rate options | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 12,412 | 13,497
Interest rate options | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 61 | 66
Interest rate options | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 49 | 57
Interest rate futures and forward commitments | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,296 | 655
Interest rate futures and forward commitments | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 9 | 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 | 11,827 | 12,007
Other contracts | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 122 | 198
Other contracts | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 106 | 190
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 3,755 | 2,975
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 3 | 1
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 111 | 121
Cash Flow Hedging | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 34,050 | 31,550
Derivative Asset, Estimated Fair Value | 13 | 64
Derivative Liability, Estimated Fair Value | 818 | 593
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 32,050 | 29,550
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 5 | 43
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 810 | 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 | 8 | 21
Cash Flow Hedging | Interest rate options | Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | $ 8 | $ 13

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