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Commitments and Contingencies Commitments and Contingencies - Table (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Obligations |  |  |
Time period shown for contractual commitments | 5 years |  |
2015 | $ 1,064 |  |
2016 | 65 |  |
2017 | 1,590 |  |
2018 | 1,718 |  |
2019 | 1,070 |  |
Thereafter | 18,829 |  |
Total | 24,336 |  |
Total | 18 |  | 13
2015 | 100 |  |
2016 | 100 |  |
2017 | 100 |  |
2018 | 100 |  |
2019 | 10 |  |
Thereafter | 0 |  |
Total | 410 |  |
Foreign currency exchange loss | 44 |  | 43
Net discount on sale of Bonds | 89 |  |
Debt |  |  |
Obligations |  |  |
2015 | 1,628 |  |
2016 | 32 |  |
2017 | 1,555 |  |
2018 | 1,682 |  |
2019 | 1,032 |  |
Thereafter | 17,692 |  |
Total | 23,621 | [1] |
Debt of VIEs |  |  |
Obligations |  |  |
2015 | 32 |  |
2016 | 33 |  |
2017 | 35 |  |
2018 | 36 |  |
2019 | 38 |  |
Thereafter | 1,137 |  |
Total | 1,311 |  |
Financial Instruments Subject to Mandatory Redemption, Financial Instrument [Domain] |  |  |
Obligations |  |  |
2015 | 2 |  |
2016 | 2 |  |
2017 | 2 |  |
2018 | 2 |  |
2019 | 2 |  |
Thereafter | 29 |  |
Total | 39 |  |
Lease Obligations - Capital |  |  |
Obligations |  |  |
2015 | 13 |  |
2016 | 13 |  |
2017 | 13 |  |
2018 | 13 |  |
2019 | 12 |  |
Thereafter | 167 |  |
Total | 231 |  |
Lease Obligations - Non-Cancelable Operating |  |  |
Obligations |  |  |
2015 | 38 |  |
2016 | 36 |  |
2017 | 34 |  |
2018 | 27 |  |
2019 | 25 |  |
Thereafter | 63 |  |
Total | 223 |  |
Purchase Obligations - Power |  |  |
Obligations |  |  |
2015 | 220 |  |
2016 | 222 |  |
2017 | 232 |  |
2018 | 235 |  |
2019 | 239 |  |
Thereafter | 3,364 |  |
Total | 4,512 |  |
Purchase Obligations - Fuel |  |  |
Obligations |  |  |
2015 | 1,335 |  |
2016 | 862 |  |
2017 | 477 |  |
2018 | 552 |  |
2019 | 492 |  |
Thereafter | 1,579 |  |
Total | 5,297 |  |
Purchase Obligations - Other |  |  |
Obligations |  |  |
2015 | 304 |  |
2016 | 215 |  |
2017 | 202 |  |
2018 | 199 |  |
2019 | 192 |  |
Thereafter | 1,640 |  |
Total | 2,752 |  |
Unfunded Loan Commitment [Member] |  |  |
Obligations |  |  |
2015 | 13 |  |
Total | 13 |  |
Payments on Other Financings |  |  |
Obligations |  |  |
2015 | 104 |  |
2016 | 104 |  |
2017 | 104 |  |
2018 | 104 |  |
2019 | 96 |  |
Thereafter | 305 |  |
Total | 817 |  |
Total |  |  |
Obligations |  |  |
2015 | 3,689 |  |
2016 | 1,519 |  |
2017 | 2,654 |  |
2018 | 2,850 |  |
2019 | 2,128 |  |
Thereafter | 25,976 |  |
Total | $ 38,816 |  |
[1] | Does not include noncash items of foreign currency exchange loss of $44 million and net discount on sale of Bonds of $89 million.

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- Definition An unfunded loan commitment is typically a letter from a lending institution to a borrower detailing out the germane terms of a loan that the lender is binding itself to (amount, rate, term, collateral, etc). It is a binding contract on the part of the lender if the borrower accepts the terms of the commitment. They usually are only binding for a short period of time. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + 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 Minimum amount of other commitment maturing in the next fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this 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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