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Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2013	Sep. 30, 2012
VIE Financing
Face amount			$ 40
Membership interests of VIE subject to mandatory redemption	$ 47	$ 47	$ 40
Liabilities
Total liabilities of VIE	1,297	1,315		$ 1,000
Long-term debt of VIE, net	1,216	1,233
Financial instruments subject to mandatory redemption, interest rate, stated percentage			7.00%
SCCG
VIE Financing
Face amount			$ 360
JSCCG
VIE Financing
Face amount				900
Holdco
VIE Financing
Face amount				100
Issuance of membership interests				$ 100
Accrued interest of VIE
Liabilities
Total liabilities of VIE	11	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	34	33
Total current liabilities of VIE
Liabilities
Total liabilities of VIE	47	47
Membership interests of VIE subject to mandatory redemption
Liabilities
Total liabilities of VIE	$ 34	$ 35

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VIE Financing [Abstract]

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Amount that would be paid, determined under the conditions specified in the contract, if the holder of the share has the right to redeem the shares.

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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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