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Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance, beginning of period | $ 102,330 | $ 82,718 |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201601Member | us-gaap:AccountingStandardsUpdate201601Member | us-gaap:AccountingStandardsUpdate201601Member
Net change related to other comprehensive income (loss) | $ 3,526 | $ 1,914 | $ (2,856)
Balance, end of period | 118,304 | 102,330 | 82,718
Derivatives |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance, beginning of period | 0 | 173 | 134
Unrealized gains (losses), net of tax | (38) | 160 | 218
Tax expense (benefit) included in provision for income taxes | 0 | 8 | 6
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | (333) | (179)
Net change related to other comprehensive income (loss) | (38) | (173) | 39
Balance, end of period | (38) | 0 | 173
Derivatives | Revenue |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification adjustments for (gains) losses | 0 | (341) | (185)
Investments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance, beginning of period | 1,488 | (850) | 1,825
Unrealized gains (losses), net of tax | 3,987 | 2,331 | (1,146)
Tax expense (benefit) included in provision for income taxes | (1) | (19) | 738
Amounts reclassified from accumulated other comprehensive income (loss) | 3 | 74 | (1,571)
Net change related to other comprehensive income (loss) | 3,990 | 2,405 | (2,717)
Balance, end of period | 5,478 | 1,488 | (850)
Investments | Cumulative effect of accounting changes |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance, beginning of period | (67) | 42 |
Balance, end of period | 0 | (67) | 42
Investments | Other Income (Expense), Net |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification adjustments for (gains) losses | 4 | 93 | (2,309)
Translation adjustments and other |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance, beginning of period | (1,828) | (1,510) | (1,332)
Net change related to other comprehensive income (loss) | (426) | (318) | (178)
Balance, end of period | (2,254) | (1,828) | (1,510)
Accumulated other comprehensive income (loss) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance, beginning of period | (340) | (2,187) | 627
Net change related to other comprehensive income (loss) | 3,526 | 1,914 | (2,856)
Balance, end of period | 3,186 | (340) | (2,187)
Accumulated other comprehensive income (loss) | Cumulative effect of accounting changes |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance, beginning of period | (67) | 42 |
Balance, end of period | $ 0 | $ (67) | $ 42

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