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Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2013	Aug. 09, 2013	Sep. 30, 2012	Jan. 17, 2012
Liabilities
Total liabilities	$ 1,206	$ 1,243				$ 1,000
Current maturities of long-term debt of variable interest entities issued at par	38	36
Long-term debt of variable interest entities, net	1,127	1,164
VIE Financing
Face Amount	$ 40						$ 100
Rate of Return SHLLC	7.00%
Accrued interest	$ 11	11
Interest expense	58	59	$ 61
JSCCG
VIE Financing
Face Amount						900	$ 900
Holdco
VIE Financing
Face Amount						$ 100
SCCG
VIE Financing
Face Amount				$ 360	$ 360
Debt and Capital Lease Obligations				$ 400
Accounts payable and accrued liabilities
Liabilities
Total liabilities	2	2
Total current liabilities
Liabilities
Total liabilities	51	49
Other long-term liabilities
Liabilities
Total liabilities	$ 28	$ 30

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