Goodwill and Intangible Assets - Schedule of Intangible Assets by Type (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Finite lived intangible assets description
Definite lived intangible assets, gross		$ 1,243	$ 1,501
Definite lived intangible assets, accumulated amortization		660	689
Definite lived intangible assets, net		583	812
Customer Relationships and Trade Names [Member]
Finite lived intangible assets description
Impaired intangible assets		116
Technology
Finite lived intangible assets description
Definite lived intangible assets, gross		866	870
Definite lived intangible assets, accumulated amortization		452	393
Definite lived intangible assets, net		414	477
Customer relationships (1)
Finite lived intangible assets description
Definite lived intangible assets, gross		251	488
Definite lived intangible assets, accumulated amortization		106	191
Definite lived intangible assets, net		145	297
Trade names (1)
Finite lived intangible assets description
Definite lived intangible assets, gross		108	120
Definite lived intangible assets, accumulated amortization		89	92
Definite lived intangible assets, net		19	28
Other
Finite lived intangible assets description
Definite lived intangible assets, gross		18	23
Definite lived intangible assets, accumulated amortization		13	13
Definite lived intangible assets, net	[1]	$ 5	$ 10

[1] During 2015, we recorded impairments relating to our customer relationships and trade names intangible assets totaling $116 million. See Note 3. "Impairment and Restructuring Charges" for further discussion.