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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	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

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Amount of asset hedged in fair value hedging relationship.

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-Topic 815
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Amortized cost of closed portfolio of financial asset used to designate hedging relationship in which hedged item is expected to be outstanding for designated hedged period.

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