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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Jun. 30, 2020
Income Taxes [Line Items] |  |  |  |  |
Effective tax rate | 10.00% | 16.00% | 13.00% | 16.00% |
Provision (benefit) for income taxes | $ 1,779 | $ 2,091 | $ 6,884 | $ 6,535 |
Long-term income taxes | 27,157 |  | 27,157 |  | $ 29,432
Unrecognized Tax Benefits and Other Income Tax Liabilities |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Long-term income taxes | $ 15,800 |  | $ 15,800 |  | $ 16,600
Earliest Tax Year |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax years impacted | 1996 |  |  |  |
Latest Tax Year |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax years impacted | 2016 |  |  |  |
India Supreme Court |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Provision (benefit) for income taxes | $ (620) |  |  |  |

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