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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, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset, Fair Value Hedge, Last-of-Layer, Amount	$ 1,000	$ 1,000
Financial Asset, Closed Portfolio, Portfolio Layer Method, Amortized Cost	1,300	1,300
Designated as Hedging Instrument [Member] | Debt Available-for-Sale Securities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset, Fair Value Hedge	1,624	1,653
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	(1)	5
Designated as Hedging Instrument [Member] | Long-term Debt [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Liability, Fair Value Hedge	(1,282)	(1,286)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	(116)	(112)
Designated as Hedging Instrument [Member] | Deposits
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Liability, Fair Value Hedge	(261)	(252)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	$ 1	$ 0

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Amount of asset hedged in fair value hedging relationship.

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