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Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Derivatives |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Unrealized gains (losses), net of tax | $ 20 | $ (4) | $ 9
Net change related to other comprehensive income (loss), tax | (1) | 6 | (4)
Investments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Unrealized gains (losses), net of tax | 411 | 247 | (393)
Net change related to other comprehensive income (loss), tax | 414 | 258 | (373)
Translation adjustments and other |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net change related to other comprehensive income (loss), tax | $ 8 | $ 0 | $ 0

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