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Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2013	Sep. 30, 2012
Variable Interest Entities
Accrued interest	$ 11	$ 11
VIE Financing
Construction management agreement and lease		1,206	$ 1,186		$ 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	$ 38	38
Long-term debt of variable interest entities, net	1,108	1,127
Interest Expense	14
SCCG
VIE Financing
Face amount				$ 360
Debt and Capital Lease Obligations				$ 400
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		51	$ 51
Other long-term liabilities
VIE Financing
Construction management agreement and lease	$ 27	$ 28

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