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Commitments and Contingencies Commitments and Contingencies - Table (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2007 Legal_actions | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Obligations |  |  |
Term of payments for civil penalty |  | 3 years |
Accrual for Environmental Loss Contingencies, Gross |  | $ 23,000,000 | $ 15,000,000
Number of claims dismissed related to NPDES permit |  | 7 |
Number of claims filed on Gallatin NPDES permit |  | 8 |
Number of reactors a COL was submitted for | Legal_actions | 2 |  |
Periodforcommitmentsandcontingenciesshown |  | 5 years |
Total |  | $ 9,000,000 | 18,000,000
2016 |  | 100,000,000 |
2017 |  | 100,000,000 |
2018 |  | 100,000,000 |
2019 |  | 10,000,000 |
2020 |  | 0 |
Thereafter |  | 0 |
Total |  | 310,000,000 |
CT and QTE outstanding leaseback obligation |  | 616,000,000 | $ 691,000,000
Plaintiff civil penalties related to Gallatin |  | 37,500 |
Membership interest of variable interest entity subject to mandatory redemption |  |  |
Obligations |  |  |
2016 |  | 2,000,000 |
2017 |  | 2,000,000 |
2018 |  | 2,000,000 |
2019 |  | 2,000,000 |
2020 |  | 3,000,000 |
Thereafter |  | 26,000,000 |
Total |  | 37,000,000 |
Lease Obligations - Capital |  |  |
Obligations |  |  |
2016 |  | 13,000,000 |
2017 |  | 13,000,000 |
2018 |  | 13,000,000 |
2019 |  | 12,000,000 |
2020 |  | 12,000,000 |
Thereafter |  | 156,000,000 |
Total |  | 219,000,000 |
Lease Obligations - Non-Cancelable Operating |  |  |
Obligations |  |  |
2016 |  | 44,000,000 |
2017 |  | 42,000,000 |
2018 |  | 32,000,000 |
2019 |  | 25,000,000 |
2020 |  | 25,000,000 |
Thereafter |  | 38,000,000 |
Total |  | 206,000,000 |
Purchase Obligations - Power |  |  |
Obligations |  |  |
2016 |  | 217,000,000 |
2017 |  | 226,000,000 |
2018 |  | 229,000,000 |
2019 |  | 235,000,000 |
2020 |  | 241,000,000 |
Thereafter |  | 3,124,000,000 |
Total |  | 4,272,000,000 |
Purchase Obligations - Fuel |  |  |
Obligations |  |  |
2016 |  | 1,282,000,000 |
2017 |  | 711,000,000 |
2018 |  | 635,000,000 |
2019 |  | 508,000,000 |
2020 |  | 335,000,000 |
Thereafter |  | 1,448,000,000 |
Total |  | 4,919,000,000 |
Purchase Obligations - Other |  |  |
Obligations |  |  |
2016 |  | 262,000,000 |
2017 |  | 198,000,000 |
2018 |  | 193,000,000 |
2019 |  | 189,000,000 |
2020 |  | 173,000,000 |
Thereafter |  | 1,830,000,000 |
Total |  | 2,845,000,000 |
Unfunded Loan Commitment [Member] |  |  |
Obligations |  |  |
2016 |  | 5,000,000 |
Total |  | 5,000,000 |
Payments on Other Financings |  |  |
Obligations |  |  |
2016 |  | 104,000,000 |
2017 |  | 104,000,000 |
2018 |  | 104,000,000 |
2019 |  | 96,000,000 |
2020 |  | 73,000,000 |
Thereafter |  | 232,000,000 |
Total |  | 713,000,000 |
Total |  |  |
Obligations |  |  |
2016 |  | 1,929,000,000 |
2017 |  | 1,296,000,000 |
2018 |  | 1,208,000,000 |
2019 |  | 1,067,000,000 |
2020 |  | 862,000,000 |
Thereafter |  | 6,854,000,000 |
Total |  | $ 13,216,000,000 |

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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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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- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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