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Commitments and Contingencies (Legal Matters) (Details) |  | 1 Months Ended | 3 Months Ended |
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Dec. 31, 2015 claim | Dec. 31, 2015 claim | Apr. 30, 2015 project | Aug. 31, 2014 project | May. 31, 2014 project | Jul. 31, 2013 project | Mar. 31, 2013 USD ($) claim | Jul. 31, 2012 USD ($) plaintiff | Apr. 30, 2012 utility | Mar. 31, 2016 USD ($) | Nov. 30, 2014 USD ($)
Legal Matters - Gas Supply Litigation (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of separate claims included in the complaint against PPL Montana | claim |  |  |  |  |  |  | 39 |  |  |  |
Average requested amount, per day per violation, of injunctive relief and civil penalties |  |  |  |  |  |  | $ 36,000 |  |  |  |
Amount of civil penalties to be used for beneficial mitigation projects |  |  |  |  |  |  | $ 100,000 |  |  |  |
Estimated number of post-2000 projects alleged not to be in compliance with the Clean Air Act | project |  |  |  |  |  | 40 |  |  |  |  |
Number of plant projects that had claims dismissed under alleged Clean Air Act violations |  | 2 |  |  | 3 |  |  |  |  |  |
Number of plant projects included in a second amended complaint under alleged Clean Air Act violations | project |  |  |  | 8 |  |  |  |  |  |  |
Number of plant projects with remaining claims to be pursued by plaintiffs | 4 |  | 4 |  |  |  |  |  |  |  |
Number of plants with more preferable legal standards claims | claim | 2 |  |  |  |  |  |  |  |  |  |
Regulatory Issues - Maryland Capacity Order (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number electric utilities ordered to enter into long term contracts | utility |  |  |  |  |  |  |  |  | 3 |  |
Regulatory Issues - Electric - Reliability Standards (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Maximum per day penalties for reliability violations |  |  |  |  |  |  |  |  |  | $ 1,000,000 |
Pacific Northwest Markets |  |  |  |  |  |  |  |  |  |  |
Regulatory Issues - Pacific Northwest Markets (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of parties claiming refunds | plaintiff |  |  |  |  |  |  |  | 2 |  |  |
Claim sought |  |  |  |  |  |  |  | $ 23,000,000 |  |  |
Remaining claim outstanding |  |  |  |  |  |  |  |  |  | $ 50,000,000 |
Pending Litigation | Topaz Gas Supply |  |  |  |  |  |  |  |  |  |  |
Legal Matters - Gas Supply Litigation (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  |  | $ 7,000,000
Settled litigation | Pacific Northwest Markets |  |  |  |  |  |  |  |  |  |  |
Regulatory Issues - Pacific Northwest Markets (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of parties claiming refunds | plaintiff |  |  |  |  |  |  |  | 1 |  |  |
Settlement amount reached with one of the parties |  |  |  |  |  |  |  | $ 75,000 |  |  |

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- Definition The dollar amount of claims alleging wrong doing for prior periods spot market bilateral sales of power in Pacific Northwest that were unsettled at period end. + References No definition available. + Details
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- Definition The average amount, per day per violation, of injunctive relief and civil penalties in the complaint. + References No definition available. + Details
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- Definition The number of plant projects included in litigation as a result of a second amended complaint related to violations of the Clean Air Act. + References No definition available. + Details
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- Definition The number of plant projects that the court dismissed best available control technology and prevention of significant deterioration claims against relating to a complaint filed under the Clean Air Act. + References No definition available. + Details
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- Definition The settlement amount reached by both parties for spot market bilateral sales made in the Pacific Northeast. + References No definition available. + Details
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- Definition Amount of civil penalties that can be assessed by the FERC under the Federal Power Act per day, per violation, for certain violations. + References No definition available. + Details
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