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Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017	Sep. 30, 2013	Sep. 30, 2012
Variable Interest Entities
Accrued interest	$ 11			$ 11		$ 11
VIE Financing
Construction management agreement and lease	$ 1,225			$ 1,225		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	$ 15	29	$ 30
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	50			50		49
Other long-term liabilities
VIE Financing
Construction management agreement and lease	$ 29			$ 29		$ 30

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