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Derivatives - Additional Information (Detail) - USD ($) | 12 Months Ended |
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Jun. 30, 2025 | Jun. 30, 2024
Derivative [Line Items] |  |
Minimum required liquidity under certain counterparty agreements | $ 1,000,000,000 |
Minimum liquidity for the period as defined by certain counterparty agreements | 1,000,000,000 |
Gross amounts of derivative assets, elected to offset | 452,000,000 | $ 304,000,000
Gross amounts of derivative liabilities, elected to offset | $ 1,800,000,000 | $ 800,000,000
Senior Unsecured Obligations |  |
Derivative [Line Items] |  |
Debt instrument credit rating | AAA |

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