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Debt - Narrative (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Jan. 27, 2017 | Sep. 30, 2016
Debt Instrument [Line Items] |  |  |  |
Interest payments on debt (Note 5) | $ 244,000,000 | $ 0 |  |
Carrying Amount, current | 2,313,000,000 |  |  | $ 0
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | $ 125,000,000 | $ 24,000,000 |  |
Commercial Paper | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt maturity period | 37 days |  |  |
Commercial Paper | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt maturity period | 66 days |  |  |
Subsequent Event | Credit Facility Expiring January 27, 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 4,000,000,000.0 |
Commercial Paper |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying Amount, current | $ 566,000,000 |  |  | $ 0

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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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