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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	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Financial Asset, Closed Portfolio, Portfolio Layer Method, Amortized Cost	$ 1,300
Hedged Asset, Fair Value Hedge, Last-of-Layer, Amount	1,000
Designated as Hedging Instrument [Member] | Debt Available-for-Sale Securities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset, Fair Value Hedge	1,653	$ 23
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	5	0
Designated as Hedging Instrument [Member] | Long-term Debt [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Liability, Fair Value Hedge	(1,286)	(1,239)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	(112)	(158)
Designated as Hedging Instrument [Member] | Deposits
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Liability, Fair Value Hedge	(252)	0
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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