Acquisitions and Divestitures - Acquisitions (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Acquisition Information [Line Items]
Net sales	$ 5,126	$ 5,503	$ 14,767	$ 16,490
Payments to acquire businesses, net of cash acquired			62	$ 250
Goodwill	6,667		$ 6,667		$ 6,653
Series of Individually Immaterial Business Acquisitions [Member]
Acquisition Information [Line Items]
Number of individually immaterial businesses acquired			4
Net sales					28
Payments to acquire businesses, net of cash acquired			$ 62
Goodwill	30		30
Goodwill, expected tax deductible amount	26		26
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles	23		$ 23
Acquired finite-lived intangible assets, weighted average useful lives			10 years
Process Management [Member]
Acquisition Information [Line Items]
Goodwill	2,802		$ 2,802		2,790
Process Management [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Acquisition Information [Line Items]
Number of individually immaterial businesses acquired			3
Climate Technologies [Member]
Acquisition Information [Line Items]
Goodwill	$ 506		$ 506		$ 492
Climate Technologies [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Acquisition Information [Line Items]
Number of individually immaterial businesses acquired			1