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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2020
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |  |
Effective income tax rate | 14.00% |  | 1.00% |  |  | 21.00% | 20.00% |
Ireland statutory income tax rate |  |  |  |  |  | 12.50% | 12.50% |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | $ 105 |  |  |  |  |  |  |
Gross tax effected unrecognized tax benefits |  |  |  |  |  |  |  | $ 2,528
Amount of unrecognized tax benefits which may impact effective tax rate |  |  |  |  |  |  |  | 2,132
Total net accrued interest, net of tax benefit |  |  |  |  |  |  |  | 205
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  |  |  |  |  | $ 37 | $ 55 |
Unrecognized Tax Benefit Decrease Resulting From Tax Audit Resolution |  |  | $ 22 | $ 22 |  |  |  |
Mark-to-market gain (loss) | 66 | $ 209 | (132) |  |  |  |  |
Mark-to-market gain (loss), tax | 17 | 53 | (34) |  |  |  |  |
Restructuring and impairment costs | 79 |  | 610 | 62 |  | 175 | $ 783 |
Restructuring charges, tax | 15 | 15 | 28 | $ 4 | $ 16 |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  |  |  |  | 30 |  |  |
2020 Restructuring Plan |  |  |  |  |  |  |  |
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  | $ 610 |  | $ 111 |  |  | $ 297
2021 Restructuring Plan |  |  |  |  |  |  |  |
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs | $ 79 | $ 96 |  |  |  | $ 175 |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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