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Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019	Sep. 30, 2013	Sep. 30, 2012
Variable Interest Entities
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	$ 1,146	$ 1,146		$ 1,167		$ 1,000
Liabilities	39,169	39,169		38,842
Accrued interest	10	10		11
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	$ 40	$ 40		39
Long-term debt of variable interest entities, net	1,069	1,069		1,089
Interest Expense	14	27	$ 28
Accounts payable and accrued liabilities
Variable Interest Entities
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities				3
Total current liabilities
Variable Interest Entities
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	53	53		53
Other long-term liabilities
Variable Interest Entities
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	24	24		$ 25
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entities
Liabilities	$ 3	$ 3
SCCG
VIE Financing
Debt and Lease Obligation					$ 400
JSCCG
VIE Financing
Face amount						900
Holdco
VIE Financing
Face amount						$ 100

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Contractual interest rate for funds borrowed, under the agreement.

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Amount of short-term and long-term debt and lease obligation.

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