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Commitments and Contingencies - Membership Interests of VIE Subject to Mandatory Redemption (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019 | Aug. 09, 2013
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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 | $ 26 | $ 28 |
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount | 35 | $ 37 | $ 40
Minimum payments on membership interests subject to mandatory redemption, due in next twelve months | 3 |  |
Other Commitment | 232 |  |
Minimum payments on membership interests subject to mandatory redemption, due in year two | 3 |  |
Minimum payments on membership interests subject to mandatory redemption, due in year three | 2 |  |
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. + Details
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- 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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- 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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- 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 + Details
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- Details
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