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Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2018	Sep. 30, 2013	Sep. 30, 2012
Variable Interest Entities
Accrued interest	$ 24	$ 11
VIE Financing
Construction management agreement and lease		1,167	$ 1,180		$ 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	$ 39	39
Long-term debt of variable interest entities, net	1,089	1,089
Interest Expense	14
SCCG
VIE Financing
Face amount				$ 360
Debt and Lease Obligation				$ 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	3	3
Total current liabilities
VIE Financing
Construction management agreement and lease		53	$ 66
Other long-term liabilities
VIE Financing
Construction management agreement and lease	$ 25	$ 25

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