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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2016
Income Taxes, Additional Information [Line Items] |  |  |  |  |  |  |  |
Effective income tax rate | 12.00% |  |  | 16.00% |  | 38.00% | 17.00% |
U.S. federal statutory income tax rate | 35.00% |  |  | 35.00% |  | 35.00% | 35.00% |
Gross tax effected unrecognized tax benefits |  |  |  |  |  |  |  | $ 1,706
Amount of unrecognized tax benefits which may impact effective tax rate |  |  |  |  |  |  |  | 1,604
Total net accrued interest, net of tax benefit |  |  |  |  |  |  |  | $ 55
Number of months for conclusion of tax exam, appeal or litigation |  |  |  |  |  | 12 months |  |
Estimated benefit to tax expense |  |  |  |  |  | $ 200 |  |
Restructuring and impairment costs | $ 49 | $ 99 | $ 78 | $ 27 | $ 60 | $ 226 | $ 87 |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | (11) |  |  |  |  |  | $ 85 |
Transaction and integration costs | 70 | 138 | 130 |  |  |  |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Restructuring Charges, Amount | $ 15 | 20 | 14 | $ 12 | $ 12 |  |  |
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 |  |  |  |  |  |
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 |  | $ (31) | $ (11) |  |  |  |  |

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