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Derivatives - Fair Value Hedge (Details) - USD ($) | Sep. 30, 2021 | Mar. 31, 2021
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Floating rate registered note due 2049 |  |
Derivatives |  |
Principal amount | $ 500,000,000 |
Floating rate registered note due 2049 | LIBOR |  |
Derivatives |  |
Principal amount | 500,000,000 |
Floating rate registered note due 2050 | LIBOR |  |
Derivatives |  |
Principal amount | 300,000,000 |
Fixed rate registered note due 2049 |  |
Derivatives |  |
Principal amount |  | $ 1,000,000,000
Fixed rate registered note due 2050 |  |
Derivatives |  |
Principal amount |  | $ 650,000,000
Interest rate contracts |  |
Derivatives |  |
Derivative notional amount | $ 800,000,000 |

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