Planned Portfolio Repositioning Actions Planned Portfolio Repositioning Actions (Details) - Planned Spinoff of Network Power and Potential Sales of Motors and Drives, Power Generation and Storage Business [Member] - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Planned Portfolio Repositioning Actions [Line Items]
Approximate amount of sales		$ 6,400
Approximate amount of pretax earnings		400
Approximate amount of cash flows		$ 500
Scenario, Forecast [Member]
Planned Portfolio Repositioning Actions [Line Items]
Estimated capitalized costs, including debt issuance costs, pension funding and the separation of information technology systems	$ 100
Scenario, Forecast [Member] | Minimum [Member]
Planned Portfolio Repositioning Actions [Line Items]
Estimated income taxes related to reorganizing the ownership structures and investment banking, legal consulting and other costs	250
Scenario, Forecast [Member] | Maximum [Member]
Planned Portfolio Repositioning Actions [Line Items]
Estimated income taxes related to reorganizing the ownership structures and investment banking, legal consulting and other costs	$ 350