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Derivative Financial Instruments And Hedging Activities (Schedule Of Derivative Instruments Notional And Fair Values) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 165,933 | $ 163,738
Derivative Asset, Estimated Fair Value | 1,548 | 1,816
Derivative Liability, Estimated Fair Value | 1,957 | 2,551
Derivative Asset, Fair Value of Derivative Contracts Offset in Accordance with Entity's Policy that were Offset Under Master Netting Agreements | 1,346 | 1,703
Derivative Liability, Fair Value of Derivative Contracts Offset In Accordance with Policy Election that were Offset Under Master Netting Agreements | 1,261 | 1,615
Derivative Asset | 202 | 113
Derivative Liability | 696 | 936
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 65 | 106
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 117 | 87
Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 44,469 | 44,144
Derivative Asset, Estimated Fair Value | 43 | 30
Derivative Liability, Estimated Fair Value | 505 | 819
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 121,464 | 119,594
Derivative Asset, Estimated Fair Value | 1,505 | 1,786
Derivative Liability, Estimated Fair Value | 1,452 | 1,732
Interest rate swaps | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 94,948 | 94,803
Interest rate swaps | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 1,295 | 1,608
Interest rate swaps | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 1,282 | 1,598
Interest rate options | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 11,746 | 11,005
Interest rate options | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 25 | 31
Interest rate options | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 17 | 24
Interest rate futures and forward commitments | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,283 | 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 | 7 | 8
Interest rate futures and forward commitments | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 2 | 4
Other contracts | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 13,487 | 12,539
Other contracts | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 178 | 139
Other contracts | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 151 | 106
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 6,271 | 5,484
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 3 | 26
Fair Value Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 98 | 95
Cash Flow Hedging | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 38,198 | 38,660
Derivative Asset, Estimated Fair Value | 40 | 4
Derivative Liability, Estimated Fair Value | 407 | 724
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 36,198 | 36,660
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Estimated Fair Value | 34 | 0
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | 403 | 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 | 6 | 4
Cash Flow Hedging | Interest rate options | Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Estimated Fair Value | $ 4 | $ 6

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