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Derivatives - Cumulative Basis Adjustment for Fair Value Hedges (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Derivatives |  |
Hedged Liability, Statement of Financial Position [Extensible Enumeration] | Long-term debt | Long-term debt
Fixed rate 30-year debenture due 2028 |  |
Derivatives |  |
Principal amount | $ 220 |
Fair value hedges |  |
Derivatives |  |
Carrying Value of the Hedged Liabilities | 918 | $ 903
Fair value hedges | Long-term debt |  |
Derivatives |  |
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Value of the Hedged Liabilities | $ (84) | $ (98)

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