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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, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Unrealized gains (losses), tax | $ 7 | $ 1 | $ 12 | $ (1)
Net change related to other comprehensive income (loss), tax | 3 | (1) | 4 | (2)
Investments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Unrealized gains (losses), tax | (128) | (111) | (178) | 45
Net change related to other comprehensive income (loss), tax | (132) | (112) | (186) | 44
Translation adjustments and other |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net change related to other comprehensive income (loss), tax | $ 0 | $ 0 | $ (9) | $ (8)

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