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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, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period |  |  | $ 118,304 |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201601Member | us-gaap:AccountingStandardsUpdate201601Member | us-gaap:AccountingStandardsUpdate201601Member | us-gaap:AccountingStandardsUpdate201601Member
Net change related to other comprehensive income (loss) | $ 257 | $ (194) | $ 171 | $ 85
Balance, end of period | 130,236 | 110,109 | 130,236 | 110,109
Derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period | (34) | (2) | (38) | 0
Unrealized gains (losses), net of tax | 25 | 2 | 45 | (4)
Tax expense included in provision for income taxes | 4 | 2 | 8 | 1
Amounts reclassified from accumulated other comprehensive income (loss) | (17) | (6) | (33) | (2)
Net change related to other comprehensive income (loss) | 8 | (4) | 12 | (6)
Balance, end of period | (26) | (6) | (26) | (6)
Derivatives | Revenue |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification adjustments for gains included in earnings | (21) | (8) | (41) | (3)
Investments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period | 5,287 | 2,065 | 5,478 | 1,488
Unrealized gains (losses), net of tax | (477) | (414) | (665) | 162
Tax expense included in provision for income taxes | 4 | 1 | 8 | 1
Amounts reclassified from accumulated other comprehensive income (loss) | (15) | (6) | (28) | (5)
Net change related to other comprehensive income (loss) | (492) | (420) | (693) | 157
Balance, end of period | 4,795 | 1,645 | 4,795 | 1,645
Investments | Cumulative effect of accounting changes |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period | 0 | 0 | 10 | 0
Investments | Other Income (Expense), Net |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification adjustments for gains included in earnings | (19) | (7) | (36) | (6)
Translation adjustments and other |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period | (2,143) | (2,124) | (2,254) | (1,828)
Net change related to other comprehensive income (loss) | 741 | 230 | 852 | (66)
Balance, end of period | (1,402) | (1,894) | (1,402) | (1,894)
Accumulated other comprehensive income (loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period | 3,110 | (61) | 3,186 | (340)
Net change related to other comprehensive income (loss) | 257 | (194) | 171 | 85
Balance, end of period | 3,367 | (255) | 3,367 | (255)
Accumulated other comprehensive income (loss) | Cumulative effect of accounting changes |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period | $ 0 | $ 0 | $ 10 | $ 0

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