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Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Aug. 09, 2013	Jan. 17, 2012
Variable Interest Entities
Interest expense	$ 63	$ 64	$ 50
VIE Financing
Membership interests of VIE subject to mandatory redemption	47	50		$ 40
Financial instruments subject to mandatory redemption, interest rate, stated percentage				7.00%
Liabilities
Total liabilities	1,328	1,362			$ 1,000
SCCG
VIE Financing
Face Amount				$ 360
JSCCG
VIE Financing
Face Amount					900
Holdco
VIE Financing
Face Amount					$ 100
Accrued interest of VIE
Liabilities
Total liabilities	12	12
Current portion of membership interests of VIE subject to mandatory redemption
Liabilities
Total liabilities	2	2
Current maturities of long-term debt of VIE
Liabilities
Total liabilities	33	32
Total current liabilities of VIE
Liabilities
Total liabilities	47	46
Membership interests of VIE subject to mandatory redemption
Liabilities
Total liabilities	35	37
Long-term debt of VIE
Liabilities
Total liabilities	$ 1,246	$ 1,279

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