Summary of Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Sep. 30, 2015 USD ($) distributor	Sep. 30, 2014 USD ($) distributor	Sep. 30, 2013 USD ($)
Schedule of Significant Accounting Policies [Line Items]
Unamortized Internal Use Software Development Costs	$ 71	$ 51
Pension and Other Postretirement Defined Benefit Plans, Measurement Period	5 years
Pension and Other Postretirement Defined Benefit Plans, Actual Period Average	10 years
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets, Adjusted	2.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets, Difference from Expected to Actual	20.00%
Advertising Expense	$ 57	$ 68	$ 54
Minimum
Schedule of Significant Accounting Policies [Line Items]
Amortization Period of Internal Use Software Capitalization	3 years
Intangible Asset, Useful Life	2 years
Maximum
Schedule of Significant Accounting Policies [Line Items]
Amortization Period of Capitalized Software Costs	2 years
Amortization Period of Internal Use Software Capitalization	7 years
Intangible Asset, Useful Life	15 years
Machinery and equipment | Minimum
Schedule of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Machinery and equipment | Maximum
Schedule of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Rental equipment | Maximum
Schedule of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Buildings | Maximum
Schedule of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Maintenance Contracts | Minimum
Schedule of Significant Accounting Policies [Line Items]
Contract Revenue Term	1 year
Maintenance Contracts | Maximum
Schedule of Significant Accounting Policies [Line Items]
Contract Revenue Term	5 years
Professional Services, Standard Solutions | Minimum
Schedule of Significant Accounting Policies [Line Items]
Contract Revenue Term	4 years
Contract Revenue Term (days)	28 days
Professional Services, Standard Solutions | Maximum
Schedule of Significant Accounting Policies [Line Items]
Contract Revenue Term	6 years
Contract Revenue Term (days)	42 days
Professional Services, Customized Solutions | Minimum
Schedule of Significant Accounting Policies [Line Items]
Contract Revenue Term	6 months
Professional Services, Customized Solutions | Maximum
Schedule of Significant Accounting Policies [Line Items]
Contract Revenue Term	1 year
Operations Services | Minimum
Schedule of Significant Accounting Policies [Line Items]
Contract Revenue Term	1 year
Operations Services | Maximum
Schedule of Significant Accounting Policies [Line Items]
Contract Revenue Term	7 years
Accounts Receivable | Customer Concentration Risk
Schedule of Significant Accounting Policies [Line Items]
Concentration Risk, Number of Customers | distributor	1
Concentration Risk, Threshold | distributor	0.14	0.11
Other Current Assets [Member]
Schedule of Significant Accounting Policies [Line Items]
Unamortized Debt Issuance Expense	$ 13
Other Assets
Schedule of Significant Accounting Policies [Line Items]
Unamortized Software Development Expense	1	$ 8
Other Noncurrent Assets [Member]
Schedule of Significant Accounting Policies [Line Items]
Unamortized Debt Issuance Expense	$ 42