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Commitments and Contingencies Commitments and Contingencies - Debt (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2014 variable_interest_entities | Sep. 30, 2013 | Aug. 09, 2013
Debt Instrument |  |  |
Remaining terms of the agreements, high end of range | 18 years |  |
Outstanding discount notes | $ 596,000,000 |  |
Outstanding long-term debt including current maturities) | 23,000,000,000 |  |
Long-term and short-term debt combined | 23,600,000,000 |  |
Number of VIEs | 3 |  |
Outstanding long-term debt (including current maturities) of VIEs | 1,300,000,000 |  |
Membership interests of VIE subject to mandatory redemption | $ 50,000,000 | $ 50,000,000 | $ 40,000,000

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6940734&loc=d3e22047-110879 + Details
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