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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2016
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | $ 199 |  |  |  |  |  | $ 108 |
Income tax provision | $ 239 |  | $ 61 |  | $ 394 | $ 314 | $ (108) |
Expected Rate on Deferred Tax Reversals | 21.00% |  |  |  |  |  | 24.50% |
Effective income tax rate | 52.00% |  | 10.00% |  | 38.00% | 30.00% |  |
Ireland statutory income tax rate | 12.50% |  |  |  |  | 12.50% |  |
Gross tax effected unrecognized tax benefits |  |  |  |  |  |  | $ 2,358 |
Amount of unrecognized tax benefits which may impact effective tax rate |  |  |  |  |  |  | 2,225 |
Total net accrued interest, net of tax benefit |  |  |  |  |  |  | $ 119 |
Income Tax Examination, Penalties and Interest Accrued | $ 49 |  |  |  | $ 49 |  |  |
Estimated benefit to tax expense | 27 |  |  |  |  |  |  |
Restructuring and impairment costs | 235 |  | $ 0 | $ 154 | 235 | $ 154 |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  | $ 76 |  |  |  |  |  |
Release of tax indemnification reserve | 226 |  |  |  |  |  |  |
Net actuarial gain |  |  |  |  | $ 8 | $ 0 |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Restructuring Charges, Amount |  |  |  | 23 |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  |  |  | 25 |  |  |  |
2016 Restructuring Plan [Member] |  |  |  |  |  |  |  |
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | $ 620
2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 222
Global Products |  |  |  |  |  |  |  |
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of | 235 |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | $ 53 |  |  |  |  |  |  |
Global Products | 2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | $ 44
Scott Safety business [Member] |  |  |  |  |  |  |  |
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |  |
Gain on sale of Scott Safety business |  |  |  | 114 |  |  |  |
Tax effect of gain on sale of Scott Safety business |  |  |  | $ 30 |  |  |  |
IRELAND |  |  |  |  |  |  |  |
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |  |
Ireland statutory income tax rate | 12.50% |  | 12.50% |  | 12.50% | 12.50% |  |

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