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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
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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