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Derivative Financial Instruments and Hedging Activities Derivative Financial Instruments and Hedging Activities (Schedule of Fair Value Hedging Basis Adjustments) (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Debt Available-for-Sale Securities [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged Asset, Fair Value Hedge | $ 123 | $ 23
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | (1) | 0
Long-term Debt [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged Liability, Fair Value Hedge | (1,246) | (1,239)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) | $ 152 | $ 158

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