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Derivative Financial Instruments and Hedging Activities Derivative Financial Instruments and Hedging Activities (Schedule of Fair Value Hedging Basis Adjustments) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged Asset, Fair Value Hedge, Portfolio method, Amount | $ 2,500 | $ 750
Financial Asset, Closed Portfolio, Portfolio Layer Method, Amortized Cost | 6,300 | 1,800
Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Fair Value, Cumulative Increase (Decrease) | 11 |
Debt Available-for-Sale Securities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) | 25 |
Designated as Hedging Instrument | Debt Available-for-Sale Securities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged Asset, Fair Value Hedge | 8,978 | 3,304
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | 38 | (22)
Designated as Hedging Instrument | Long-term Debt |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged Liability, Fair Value Hedge | (2,349) | (3,058)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) | $ 51 | $ 91

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