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Derivatives - Fair Value Hedge (Details) - Fair value hedges - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Long-term debt |  |
Derivatives |  |
Carrying Value of the Hedged Liabilities | $ 916,000,000 | $ 903,000,000
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Value of the Hedged Liabilities | (86,000,000) | $ (98,000,000)
Fixed rate 30-year debenture due 2028 |  |
Derivatives |  |
Principal amount | $ 220,000,000 |
Fixed rate 30-year debenture due 2028 | Interest rate contracts |  |
Derivatives |  |
Term of debt instrument (in years) | 30 years |

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