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Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2013	Sep. 30, 2012
Variable Interest Entities
Accrued interest	$ 26		$ 26		$ 11
VIE Financing
Construction management agreement and lease	$ 1,240		$ 1,240		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	43	$ 45
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	65		65		49
Other long-term liabilities
VIE Financing
Construction management agreement and lease	$ 29		$ 29		$ 30

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