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Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions	Jun. 30, 2015	Sep. 30, 2014	Aug. 09, 2013	Jan. 17, 2012
VIE Financing
Membership interests of VIE subject to mandatory redemption	$ 47	$ 50	$ 40
Liabilities
Total liabilities of VIE	1,360	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 of VIE	26	12
Current portion of membership interests of VIE subject to mandatory redemption
Liabilities
Total liabilities of VIE	2	2
Current maturities of long-term debt of VIE
Liabilities
Total liabilities of VIE	33	32
Total current liabilities of VIE
Liabilities
Total liabilities of VIE	61	46
Membership interests of VIE subject to mandatory redemption
Liabilities
Total liabilities of VIE	36	37
Long-term debt of VIE
Liabilities
Total liabilities of VIE	$ 1,263	$ 1,279

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VIE Financing [Abstract]

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Face (par) amount of debt instrument at time of issuance.

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The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

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