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Commitments and Contingencies Commitments and Contingencies - Membership Interests of VIE Subject to Mandatory Redemption (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Aug. 09, 2013
Long-term Purchase Commitment
Membership interests of VIE subject to mandatory redemption (including current portion)	$ 37	$ 41	$ 40
2018	2
Total	331
2019	3
2020	3
2021	3
2022	$ 2

X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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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.

+ Details

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X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

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X

- 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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