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Commitments and Contingencies - Membership Interests of VIE Subject to Mandatory Redemption (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
Portion at Other than Fair Value Measurement [Member]
Long-term Purchase Commitment [Line Items]
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount	$ 23	$ 26
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount	30	$ 35
Minimum payments on membership interests subject to mandatory redemption, due in next twelve months	3
Minimum payments on membership interests subject to mandatory redemption, due in year two	2
Minimum payments on membership interests subject to mandatory redemption, due in year three	1
Minimum payments on membership interests subject to mandatory redemption, due in year four	1
Minimum payments on membership interests subject to mandatory redemption, due in year five	$ 1

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- Definition

Minimum payments on membership interests subject to mandatory redemption, due in next twelve months

+ References

No definition available.

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- Definition

Minimum payments on membership interests subject to mandatory redemption, due in year five

+ References

No definition available.

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- Definition

Minimum payments on membership interests subject to mandatory redemption, due in year four

+ References

No definition available.

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- Definition

Minimum payments on membership interests subject to mandatory redemption, due in year three

+ References

No definition available.

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- Definition

Minimum payments on membership interests subject to mandatory redemption, due in year two

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount that would be paid, determined under the conditions specified in the contract, if the holder of the share has the right to redeem the shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109262807&loc=d3e22047-110879

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