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Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2013	Sep. 30, 2012
Variable Interest Entities
Accrued interest	$ 26		$ 11
VIE Financing
Construction management agreement and lease	1,258		1,243	$ 400	$ 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	36		$ 36
Long-term debt of variable interest entities, net	1,164		1,164
Interest Expense	15	$ 15
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
Total current liabilities
VIE Financing
Construction management agreement and lease	64		49
Other long-term liabilities
VIE Financing
Construction management agreement and lease	$ 30		$ 30

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