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Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2013	Sep. 30, 2012
Variable Interest Entities
Accrued interest	$ 25		$ 11
VIE Financing
Construction management agreement and lease			1,206	$ 1,220		$ 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	1,127		1,127
Interest Expense	14	$ 15
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	$ 65
Other long-term liabilities
VIE Financing
Construction management agreement and lease	$ 28		$ 28

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