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Commitments and Contingencies Commitments and Contingencies - Table (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013
Obligations |  |  |  |  |
Time period shown for contractual commitments |  |  |  | 5 years |
2014 | $ 62 | [1] |  |  |
2015 | 1,064 | [1] |  |  |
2016 | 65 | [1] |  |  |
2017 | 1,590 | [1] |  |  |
2018 | 1,718 | [1] |  |  |
Thereafter | 19,231 | [1] |  |  |
Total | 23,730 | [1] |  |  |
Total | 149 |  | 148 |  |
2014 | 100 |  |  |  |
2015 | 100 |  |  |  |
2016 | 100 |  |  |  |
2017 | 100 |  |  |  |
2018 | 100 |  |  |  |
Thereafter | 10 |  |  |  |
Total | 510 |  |  |  |
Foreign currency exchange loss | 43 |  | 41 |  |
Net discount on sale of Bonds | 85 |  |  |  |
Debt |  |  |  |  |
Obligations |  |  |  |  |
2014 | 2,464 | [1] |  | 2,464 | [1]
2015 | 1,032 | [1] |  | 1,032 | [1]
2016 | 32 | [1] |  | 32 | [1]
2017 | 1,555 | [1] |  | 1,555 | [1]
2018 | 1,682 | [1] |  | 1,682 | [1]
Thereafter | 18,056 | [1] |  | 18,056 | [1]
Total | 24,821 | [1] |  | 24,821 | [1]
Debt of VIEs |  |  |  |  |
Obligations |  |  |  |  |
2014 | 30 |  |  | 30 |
2015 | 32 |  |  | 32 |
2016 | 33 |  |  | 33 |
2017 | 35 |  |  | 35 |
2018 | 36 |  |  | 36 |
Thereafter | 1,175 |  |  | 1,175 |
Total | 1,341 |  |  | 1,341 |
Financial Instruments Subject to Mandatory Redemption, Financial Instrument [Domain] |  |  |  |  |
Obligations |  |  |  |  |
2014 | 2 |  |  | 2 |
2015 | 2 |  |  | 2 |
2016 | 2 |  |  | 2 |
2017 | 2 |  |  | 2 |
2018 | 2 |  |  | 2 |
Thereafter | 30 |  |  | 30 |
Total | 40 |  |  | 40 |
Lease Obligations - Capital |  |  |  |  |
Obligations |  |  |  |  |
2014 | 5 |  |  | 5 |
2015 | 5 |  |  | 5 |
2016 | 5 |  |  | 5 |
2017 | 5 |  |  | 5 |
2018 | 5 |  |  | 5 |
Thereafter | 36 |  |  | 36 |
Total | 61 |  |  | 61 |
Lease Obligations - Non-Cancelable Operating |  |  |  |  |
Obligations |  |  |  |  |
2014 | 37 |  |  | 37 |
2015 | 30 |  |  | 30 |
2016 | 29 |  |  | 29 |
2017 | 28 |  |  | 28 |
2018 | 27 |  |  | 27 |
Thereafter | 87 |  |  | 87 |
Total | 238 |  |  | 238 |
Purchase Obligations - Power |  |  |  |  |
Obligations |  |  |  |  |
2014 | 219 |  |  | 219 |
2015 | 204 |  |  | 204 |
2016 | 219 |  |  | 219 |
2017 | 231 |  |  | 231 |
2018 | 230 |  |  | 230 |
Thereafter | 3,336 |  |  | 3,336 |
Total | 4,439 |  |  | 4,439 |
Purchase Obligations - Fuel |  |  |  |  |
Obligations |  |  |  |  |
2014 | 1,419 |  |  | 1,419 |
2015 | 1,176 |  |  | 1,176 |
2016 | 794 |  |  | 794 |
2017 | 442 |  |  | 442 |
2018 | 498 |  |  | 498 |
Thereafter | 2,002 |  |  | 2,002 |
Total | 6,331 |  |  | 6,331 |
Purchase Obligations - Other |  |  |  |  |
Obligations |  |  |  |  |
2014 | 255 |  |  | 255 |
2015 | 210 |  |  | 210 |
2016 | 184 |  |  | 184 |
2017 | 182 |  |  | 182 |
2018 | 502 |  |  | 502 |
Thereafter | 1,221 |  |  | 1,221 |
Total | 2,554 |  |  | 2,554 |
Payments on Other Financings |  |  |  |  |
Obligations |  |  |  |  |
2014 | 100 |  |  | 100 |
2015 | 104 |  |  | 104 |
2016 | 104 |  |  | 104 |
2017 | 104 |  |  | 104 |
2018 | 104 |  |  | 104 |
Thereafter | 401 |  |  | 401 |
Total | 917 |  |  | 917 |
Total |  |  |  |  |
Obligations |  |  |  |  |
2014 | 4,531 |  |  | 4,531 |
2015 | 2,795 |  |  | 2,795 |
2016 | 1,402 |  |  | 1,402 |
2017 | 2,584 |  |  | 2,584 |
2018 | 3,086 |  |  | 3,086 |
Thereafter | 26,344 |  |  | 26,344 |
Total | $ 40,742 |  |  | $ 40,742 |
[1] | Does not include noncash items of foreign currency exchange loss of $43 million and net discount on sale of Bonds of $85 million.

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- Definition Minimum amount of other commitment maturing after the fifth 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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Data Type: | xbrli:monetaryItemType
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- Definition Minimum amount of other commitment maturing in the fifth 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Definition Minimum amount of other commitment maturing in the fourth 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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Data Type: | xbrli:monetaryItemType
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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Definition Minimum amount of other commitment maturing in the second 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Definition Minimum amount of other commitment maturing in the third 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Definition Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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