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Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 169,475 | $ 163,738
Derivative Asset, Estimated Fair Value | 1,408 | 1,816
Derivative Liability, Estimated Fair Value | 1,497 | 2,551
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements | 1,171 | 1,703
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements | 1,000 | 1,615
Derivative Asset | 237 | 113
Derivative Liability | 497 | 936
Derivative Asset, Collateral, Obligation to Return Cash, Offset | (84) | (106)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | (115) | (87)
Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 45,951 | 44,144
Derivative Asset, Estimated Fair Value | 146 | 30
Derivative Liability, Estimated Fair Value | 312 | 819
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 123,524 | 119,594
Derivative Asset, Estimated Fair Value | 1,262 | 1,786
Derivative Liability, Estimated Fair Value | 1,185 | 1,732
Interest rate swaps | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 95,826 | 94,803
Interest rate swaps | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 1,080 | 1,608
Interest rate swaps | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 1,034 | 1,598
Interest rate options | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 11,211 | 11,005
Interest rate options | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 19 | 31
Interest rate options | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 8 | 24
Interest rate futures and forward commitments | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,682 | 1,247
Interest rate futures and forward commitments | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 8 | 8
Interest rate futures and forward commitments | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 3 | 4
Other contracts | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 14,805 | 12,539
Other contracts | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 155 | 139
Other contracts | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 140 | 106
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 7,533 | 5,484
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 10 | 26
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 97 | 95
Cash Flow Hedging | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 38,418 | 38,660
Derivative Asset, Estimated Fair Value | 136 | 4
Derivative Liability, Estimated Fair Value | 215 | 724
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 36,418 | 36,660
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 133 | 0
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 214 | 718
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 | 3 | 4
Cash Flow Hedging | Interest rate options | Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | $ 1 | $ 6

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