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Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2013 | Sep. 30, 2012
Variable Interest Entities |  |  |  |  |
Accrued interest | $ 26 |  | $ 11 |  |
VIE Financing |  |  |  |  |
Construction management agreement and lease | 1,258 |  | 1,243 | $ 400 | $ 1,000
Face amount |  |  | $ 40 |  |
Financial instruments subject to mandatory redemption, interest rate, stated percentage |  |  | 7.00% |  |
Liabilities |  |  |  |  |
Current maturities of long-term debt of variable interest entities | 36 |  | $ 36 |  |
Long-term debt of variable interest entities, net | 1,164 |  | 1,164 |  |
Interest Expense | 15 | $ 15 |  |  |
SCCG |  |  |  |  |
VIE Financing |  |  |  |  |
Face amount |  |  | 360 |  |
JSCCG |  |  |  |  |
VIE Financing |  |  |  |  |
Face amount |  |  | 900 |  |
Holdco |  |  |  |  |
VIE Financing |  |  |  |  |
Face amount |  |  | 100 |  |
Accounts payable and accrued liabilities |  |  |  |  |
VIE Financing |  |  |  |  |
Construction management agreement and lease | 2 |  | 2 |  |
Total current liabilities |  |  |  |  |
VIE Financing |  |  |  |  |
Construction management agreement and lease | 64 |  | 49 |  |
Other long-term liabilities |  |  |  |  |
VIE Financing |  |  |  |  |
Construction management agreement and lease | $ 30 |  | $ 30 |  |

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