Derivative Financial Instruments and Hedging Activities Derivative Financial Instruments and Hedging Activities (Schedule of Fair Value Hedging Basis Adjustments) (Details) - USD ($) $ in Millions |
Mar. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | ||
| Hedged Asset, Fair Value Hedge, Portfolio method, Amount | $ 1,000 | $ 750 |
| Financial Asset, Closed Portfolio, Portfolio Layer Method, Amortized Cost | 2,700 | 1,800 |
| Designated as Hedging Instrument | Debt Available-for-Sale Securities | ||
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | ||
| Hedged Asset, Fair Value Hedge | 4,757 | 3,304 |
| Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | 24 | (22) |
| Designated as Hedging Instrument | Long-term Debt | ||
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | ||
| Hedged Liability, Fair Value Hedge | (3,083) | (3,058) |
| Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) | $ 66 | $ 91 |