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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |
Discrete non-cash tax charge |  | $ 101 |  |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  | $ 305 |  |  |  |  |
Effective income tax rate | 14.00% |  | 129.00% |  | 31.00% | 62.00% |
U.S. federal statutory income tax rate |  | 21.00% |  |  |  | 35.00% |
Gross tax effected unrecognized tax benefits |  |  |  |  |  |  | $ 2,173
Amount of unrecognized tax benefits which may impact effective tax rate |  |  |  |  |  |  | 2,047
Total net accrued interest, net of tax benefit |  |  |  |  |  |  | $ 99
Estimated benefit to tax expense |  | $ 25 |  |  |  |  |
Restructuring and impairment costs | $ 0 | 158 | $ 99 | $ 78 | $ 158 | $ 177 |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  |  | 8 | 46 |  |  |
Net actuarial gain | 0 |  | 18 | 117 | $ 0 | $ 135 |
Transaction and integration costs | 64 | 50 | 138 | 130 |  |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Restructuring Charges, Amount |  | $ 24 | 20 | 14 |  |  |
Blended 2018 U.S. Effective Tax Rate [Member] |  |  |  |  |  |  |
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |
U.S. federal statutory income tax rate |  | 24.50% |  |  |  |  |
Change in Entity Status [Domain] |  |  |  |  |  |  |
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  |  |  | 101 |  |  |
Transaction and integration costs [Member] |  |  |  |  |  |  |
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | $ 9 | $ 7 | 31 | $ 11 |  |  |
Outside basis difference of certain subsidiaries of the Scott Safety business [Domain] |  |  |  |  |  |  |
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  |  | $ 457 |  |  |  |
Other Property [Member] | Blended 2018 U.S. Effective Tax Rate [Member] |  |  |  |  |  |  |
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |
U.S. federal statutory income tax rate |  | 8.00% |  |  |  |  |
Cash [Member] | Blended 2018 U.S. Effective Tax Rate [Member] |  |  |  |  |  |  |
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |
U.S. federal statutory income tax rate |  | 15.50% |  |  |  |  |
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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