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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Income Taxes [Line Items] |  |  |  |  |  |
TCJA, provisional net charge for income taxes |  |  |  |  | $ 13,700 |
TCJA, adjustment to provisional net charge for income taxes |  | $ 157 |  | $ 157 |  |
Provision (benefit) for income taxes |  |  | $ 8,755 | 4,448 | 19,903 |
Income taxes paid, net of refunds |  |  | 12,500 | 8,400 | 5,500 |
Gross unrecognized tax benefits related to uncertain tax positions | $ 13,146 |  | 13,792 | 13,146 | 11,961 | $ 11,737
Gross unrecognized tax benefits related to uncertain tax positions, if recognized would affect our effective tax rates | 12,000 |  | 12,100 | 12,000 | 11,300 |
Accrued interest expense related to uncertain tax positions net of federal income tax benefits | 3,400 |  | 4,000 | 3,400 | 3,000 |
Interest expense related to uncertain tax positions, net of income tax benefits |  |  | $ 579 | $ 515 | $ 688 |
Regional Operating Centers |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Foreign earnings, taxed at rates lower than U.S. rate as a percentage of foreign income before tax |  |  | 86.00% | 82.00% | 87.00% |
Federal |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | $ 547 |  |  |
Foreign Country |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | 2,000 |  |  |
Removal of operating loss carryforwards |  |  | 2,000 |  |  |
Removal of operating loss carryforwards, valuation allowance |  |  | 2,000 |  |  |
State |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | $ 975 |  |  |
Federal and State | Earliest Tax Year |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carryforwards expiration year |  |  | 2021 |  |  |
Federal and State | Latest Tax Year |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carryforwards expiration year |  |  | 2040 |  |  |
Transfer of Intangible Properties |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Provision (benefit) for income taxes | $ (2,600) |  |  | $ (2,600) |  |

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