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Derivative Financial Instruments And Hedging Activities (Schedule Of The Effect Of Derivative Instruments On The Statements Of Operations) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Debt securities | $ 293 | $ 241 | $ 845 | $ 669
Long-term borrowings | (75) | (85) | (237) | (190)
Deposits | (456) | (507) | (1,345) | (1,504)
Fair Value Hedging | Interest Rate Contract | Taxable Debt Securities in Interest Income [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amounts Related to Interest Settlements on Derivatives | 7 | 2 | 15 | 7
Gain or (Loss) Recognized in Income on Derivatives | (7) | (8) | (86) | (2)
Gain or (Loss) Recognized in Income on Related Hedged Item | 7 | 9 | 86 | 2
Gain (Loss) on Fair Value Hedges Recognized in Earnings | 7 | 3 | 15 | 7
Fair Value Hedging | Interest Rate Contract | Long-term Borrowings In Interest Expense [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amounts Related to Interest Settlements on Derivatives | (6) | (18) | (27) | (52)
Gain or (Loss) Recognized in Income on Derivatives | 6 | 39 | 40 | 45
Gain or (Loss) Recognized in Income on Related Hedged Item | (6) | (39) | (40) | (45)
Gain (Loss) on Fair Value Hedges Recognized in Earnings | $ (6) | (18) | $ (27) | (52)
Fair Value Hedging | Interest Rate Contract | Deposits |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amounts Related to Interest Settlements on Derivatives |  | 0 |  | (1)
Gain or (Loss) Recognized in Income on Derivatives |  | 1 |  | 0
Gain or (Loss) Recognized in Income on Related Hedged Item |  | (1) |  | 0
Gain (Loss) on Fair Value Hedges Recognized in Earnings |  | $ 0 |  | $ (1)

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