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Variable Interest Entities Variable Interest Entities (Details) - USD ($)	3 Months Ended	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2013	Sep. 30, 2012
Variable Interest Entities
Accrued interest	$ 25,000,000	$ 25,000,000		$ 11,000,000
VIE Financing
Construction management agreement and lease			$ 1,201,000,000	1,206,000,000		$ 1,000,000,000
Face amount	$ 40,000,000	$ 40,000,000
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	$ 38,623,895	$ 38,623,895		38,000,000
Long-term debt of variable interest entities, net	1,108,000,000	1,108,000,000		1,127,000,000
Interest Expense	14,000,000	42,000,000	43,000,000
SCCG
VIE Financing
Face amount					$ 360,000,000
Debt and Lease Obligation					$ 400,000,000
JSCCG
VIE Financing
Face amount						900,000,000
Holdco
VIE Financing
Face amount						$ 100,000,000
Accounts payable and accrued liabilities
VIE Financing
Construction management agreement and lease	2,000,000	2,000,000		2,000,000
Total current liabilities
VIE Financing
Construction management agreement and lease			$ 66,000,000	51,000,000
Other long-term liabilities
VIE Financing
Construction management agreement and lease	$ 27,000,000	$ 27,000,000		$ 28,000,000

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