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Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Unrealized gains (losses), net of tax | $ 10 | $ 13 | $ 6 | $ 2
Net change related to other comprehensive income (loss), tax | (1) | (9) | 5 | (8)
Investments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Unrealized gains (losses), net of tax | 352 | 89 | 277 | (421)
Net change related to other comprehensive income (loss), tax | 353 | 91 | 284 | (412)
Translation adjustments and other |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net change related to other comprehensive income (loss), tax | $ 0 | $ 0 | $ 0 | $ 0

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