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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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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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