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Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
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) | $ (1,905) | $ 2,931 | $ (1,734) | $ 3,016
Balance, end of period | 134,505 | 114,501 | 134,505 | 114,501
Derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period | (26) | (6) | (38) | 0
Unrealized gains (losses), net of tax | (2) | (46) | 43 | (50)
Tax expense (benefit) included in provision for income taxes | (6) | (2) | 2 | (1)
Amounts reclassified from accumulated other comprehensive income (loss) | 20 | 10 | (13) | 8
Net change related to other comprehensive income (loss) | 18 | (36) | 30 | (42)
Balance, end of period | (8) | (42) | (8) | (42)
Derivatives | Revenue |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification adjustments for (gains) losses included in earnings | 26 | 12 | (15) | 9
Investments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period | 4,795 | 1,645 | 5,478 | 1,488
Unrealized gains (losses), net of tax | (1,696) | 3,504 | (2,361) | 3,666
Tax expense (benefit) included in provision for income taxes | 2 | (1) | 10 | 0
Amounts reclassified from accumulated other comprehensive income (loss) | (9) | 4 | (37) | (1)
Net change related to other comprehensive income (loss) | (1,705) | 3,508 | (2,398) | 3,665
Balance, end of period | 3,090 | 5,153 | 3,090 | 5,153
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) losses included in earnings | (11) | 5 | (47) | (1)
Translation adjustments and other |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period | (1,402) | (1,894) | (2,254) | (1,828)
Net change related to other comprehensive income (loss) | (218) | (541) | 634 | (607)
Balance, end of period | (1,620) | (2,435) | (1,620) | (2,435)
Accumulated other comprehensive income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period | 3,367 | (255) | 3,186 | (340)
Net change related to other comprehensive income (loss) | (1,905) | 2,931 | (1,734) | 3,016
Balance, end of period | 1,462 | 2,676 | 1,462 | 2,676
Accumulated other comprehensive income | Cumulative effect of accounting changes |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance, beginning of period | $ 0 | $ 0 | $ 10 | $ 0

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