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Derivatives - Fair Value Hedge (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2021
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Interest rate contracts |  |
Derivatives |  |
Derivative, notional amount |  | $ 800,000,000
Floating rate registered note due 2049 |  |
Derivatives |  |
Principal amount |  | 500,000,000
Floating rate registered note due 2050 | L I B O R |  |
Derivatives |  |
Principal amount |  | 300,000,000
Fixed rate registered note due 2049 |  |
Derivatives |  |
Principal amount | $ 500,000,000 | 1,000,000,000
Fixed rate registered note due 2050 |  |
Derivatives |  |
Principal amount | 350,000,000 | $ 650,000,000
Fixed rate 30-year debenture due 2028 |  |
Derivatives |  |
Principal amount | $ 220,000,000 |

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