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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2016
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  |  |  |  |  |  | $ 108 |
Income tax provision | $ 47 |  | $ 36 |  | $ 155 | $ 253 | $ (108) |
Expected Rate on Deferred Tax Reversals | 21.00% |  |  |  |  |  | 24.50% |
Effective income tax rate | 15.00% |  | 14.00% |  | 27.00% | 60.00% |  |
U.S. federal statutory income tax rate | 12.50% |  |  |  | 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 | $ 31 |  |  |  | $ 31 |  |  |
Estimated benefit to tax expense |  |  |  | $ 25 |  |  |  |
Restructuring and impairment costs | $ 0 |  | $ 0 | 154 | 0 | $ 154 |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  | $ (76) |  |  |  |  |  |
Net actuarial gain |  |  |  |  | $ (1) | $ 0 |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Restructuring Charges, Amount |  |  |  | (23) |  |  |  |
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
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] |  |  |  |  |  |  |  |
U.S. federal statutory income tax rate | 12.50% |  | 12.50% |  | 12.50% | 12.50% |  |

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