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Derivative And Credit-Related Financial Instruments (Schedule Of Net Gains Recognized In Income On Customer-Initiated Derivatives) (Details) - Customer-initiated and other activities - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net derivative gain recognized in income | $ 18 | $ 19
Interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net derivative gain recognized in income | 4 | 5
Energy contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net derivative gain recognized in income | 3 | 3
Foreign exchange contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net derivative gain recognized in income | $ 11 | $ 11

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