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Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance, beginning of period | $ 102,330 |
Net change related to other comprehensive income (loss) | 279 | $ (361)
Balance, end of period | 106,061 | 85,967
Derivatives |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance, beginning of period | 0 | 173
Unrealized gains (losses), net of tax | (6) | 44
Tax expense (benefit) included in provision for income taxes | (1) | 3
Amounts reclassified from accumulated other comprehensive income (loss) | 4 | (89)
Net change related to other comprehensive income (loss) | (2) | (45)
Balance, end of period | (2) | 128
Derivatives | Revenue |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Reclassification adjustments for (gains) losses | 5 | (92)
Investments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance, beginning of period | 1,488 | (850)
Unrealized gains (losses), net of tax | 576 | (323)
Tax expense (benefit) included in provision for income taxes | 0 | (16)
Amounts reclassified from accumulated other comprehensive income (loss) | 1 | 62
Net change related to other comprehensive income (loss) | 577 | (261)
Cumulative effect of accounting changes | 0 | (67)
Balance, end of period | 2,065 | (1,178)
Investments | Other Income (Expense), Net |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Reclassification adjustments for (gains) losses | 1 | 78
Translation adjustments and other |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance, beginning of period | (1,828) | (1,510)
Net change related to other comprehensive income (loss) | (296) | (55)
Balance, end of period | (2,124) | (1,565)
Accumulated other comprehensive loss |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance, beginning of period | (340) | (2,187)
Net change related to other comprehensive income (loss) | 279 | (361)
Cumulative effect of accounting changes | 0 | (67)
Balance, end of period | $ (61) | $ (2,615)

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