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Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2013	Sep. 30, 2012
Variable Interest Entities
Other long-term liabilities	$ 1,867		$ 1,867		$ 2,548
Accrued interest	10		10		10
VIE Financing
Face amount	$ 40		$ 40			$ 360
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	$ 42		$ 42		41
Long-term debt of variable interest entities, net	1,028		1,028		1,048
Liabilities, Current	4,174		4,174		4,711
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entities
Other long-term liabilities	21		21		23
Liabilities	1,104		1,104		1,125		$ 1,000
Liabilities
Liabilities, Current	55		55		54
Interest Expense	13	$ 14	26	$ 27
Accounts Payable and Accrued Liabilities	$ 3		$ 3		$ 3
JSCCG
VIE Financing
Face amount							900
Holdco
VIE Financing
Face amount							$ 100
SCCG
VIE Financing
Debt and Lease Obligation						$ 400

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