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Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period |  |  | $ 102,330 |
Net change related to other comprehensive income (loss) | $ (194) | $ 602 | 85 | $ 241
Balance, end of period | 110,109 | 92,128 | 110,109 | 92,128
Derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period | (2) | 128 | 0 | 173
Unrealized gains (losses), net of tax | 2 | 71 | (4) | 115
Tax expense (benefit) included in provision for income taxes | 2 | 2 | 1 | 5
Amounts reclassified from accumulated other comprehensive income (loss) | (6) | (86) | (2) | (175)
Net change related to other comprehensive income (loss) | (4) | (15) | (6) | (60)
Balance, end of period | (6) | 113 | (6) | 113
Derivatives | Revenue |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification adjustments for (gains) losses | (8) | (88) | (3) | (180)
Investments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period | 2,065 | (1,178) | 1,488 | (850)
Unrealized gains (losses), net of tax | (414) | 879 | 162 | 556
Tax expense (benefit) included in provision for income taxes | 1 | 0 | 1 | (16)
Amounts reclassified from accumulated other comprehensive income (loss) | (6) | 2 | (5) | 64
Net change related to other comprehensive income (loss) | (420) | 881 | 157 | 620
Cumulative effect of accounting changes | 0 | 0 | 0 | (67)
Balance, end of period | 1,645 | (297) | 1,645 | (297)
Investments | Other Income (Expense), Net |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification adjustments for (gains) losses | (7) | 2 | (6) | 80
Translation adjustments and other |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period | (2,124) | (1,565) | (1,828) | (1,510)
Net change related to other comprehensive income (loss) | 230 | (264) | (66) | (319)
Balance, end of period | (1,894) | (1,829) | (1,894) | (1,829)
Accumulated other comprehensive loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period | (61) | (2,615) | (340) | (2,187)
Net change related to other comprehensive income (loss) | (194) | 602 | 85 | 241
Cumulative effect of accounting changes | 0 | 0 | 0 | (67)
Balance, end of period | $ (255) | $ (2,013) | $ (255) | $ (2,013)

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