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Derivatives - Fair Value Hedge (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Derivatives |  |
Hedged Liability, Statement of Financial Position [Extensible Enumeration] | Long-term debt | Long-term debt
Fair value hedges |  |
Derivatives |  |
Carrying Value of the Hedged Liabilities | $ 907,000,000 | $ 903,000,000
Fair value hedges | Long-term debt |  |
Derivatives |  |
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Value of the Hedged Liabilities | (96,000,000) | $ (98,000,000)
Fixed rate 30-year debenture due 2028 | Fair value hedges |  |
Derivatives |  |
Principal amount | $ 220,000,000 |
Fixed rate 30-year debenture due 2028 | Fair value hedges | Interest rate contracts |  |
Derivatives |  |
Term of debt instrument (in years) | 30 years |

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