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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
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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Amount of asset hedged in fair value hedging relationship.

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