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Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2013 | Sep. 30, 2012
Variable Interest Entities |  |  |  |  |  |  |  |
Accrued interest | $ 11 |  |  | $ 11 |  | $ 11 |  |
VIE Financing |  |  |  |  |  |  |  |
Construction management agreement and lease | $ 1,225 |  |  | $ 1,225 |  | 1,243 | $ 400 | $ 1,000
Face amount |  |  |  |  |  |  | 40 |
Financial instruments subject to mandatory redemption, interest rate, stated percentage | 7.00% |  |  | 7.00% |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Current maturities of long-term debt of variable interest entities | $ 37 |  |  | $ 37 |  | 36 |  |
Long-term debt of variable interest entities, net | 1,146 |  |  | 1,146 |  | 1,164 |  |
Interest Expense | 14 | $ 15 | $ 15 | 29 | $ 30 |  |  |
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 |  | 2 |  |
Total current liabilities |  |  |  |  |  |  |  |
VIE Financing |  |  |  |  |  |  |  |
Construction management agreement and lease | 50 |  |  | 50 |  | 49 |  |
Other long-term liabilities |  |  |  |  |  |  |  |
VIE Financing |  |  |  |  |  |  |  |
Construction management agreement and lease | $ 29 |  |  | $ 29 |  | $ 30 |  |

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