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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, 2024 | Dec. 31, 2023
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged Asset, Fair Value Hedge, Portfolio method, Amount |  | $ 1,000
Financial Asset, Closed Portfolio, Portfolio Layer Method, Amortized Cost |  | 1,300
Designated as Hedging Instrument | Debt Available-for-Sale Securities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged Asset, Fair Value Hedge | $ 1,754 | 1,653
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | 7 | 5
Designated as Hedging Instrument | Long-term Debt |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged Liability, Fair Value Hedge | (3,081) | (1,286)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) | 68 | 112
Designated as Hedging Instrument | Deposits |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Hedged Liability, Fair Value Hedge | (10) | (252)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) | $ 0 | $ 0

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