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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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