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v3.6.0.2

Subsequent Events (Details) | Feb. 17, 2017 USD ($) Natural_gas_plant | Feb. 16, 2017 USD ($) agreement | Jan. 18, 2017 USD ($) Natural_gas_plant limited_guaranty MW | Dec. 06, 2016 USD ($) | Dec. 31, 2016 MW | Dec. 05, 2016 USD ($)
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Purchase Agreement with Aspen Generating, LLC |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Plant generation capacity (in MW's) |  |  |  |  | 1,572 |
Subsequent Event | Purchase Agreement with Aspen Generating, LLC |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Plant generation capacity (in MW's) |  |  | 1,572 |  |  |
Cash purchase price | $ | $ 925,000,000 |  | $ 925,000,000 |  |  |
Number of limited guaranties | limited_guaranty |  |  | 2 |  |  |
Subsequent Event | Purchase Agreement with Aspen Generating, LLC | Minimum |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Term of guaranties |  |  | 1 year |  |  |
Subsequent Event | Purchase Agreement with Aspen Generating, LLC | Maximum |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Term of guaranties |  |  | 3 years |  |  |
Subsequent Event | Purchase Agreement with Aspen Generating, LLC | Bath County Hydro |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Plant generation capacity (in MW's) |  |  | 713 |  |  |
Subsequent Event | Purchase Agreement with Aspen Generating, LLC | Springdale Generating Facility Units 1-5 |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Plant generation capacity (in MW's) |  |  | 638 |  |  |
Subsequent Event | Purchase Agreement with Aspen Generating, LLC | Chamberburg Generating Facility Units 12-13 |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Plant generation capacity (in MW's) |  |  | 88 |  |  |
Subsequent Event | Purchase Agreement with Aspen Generating, LLC | Gans Generating Facility Units 8-9 |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Plant generation capacity (in MW's) |  |  | 88 |  |  |
Subsequent Event | Purchase Agreement with Aspen Generating, LLC | Hunlock Creek |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Plant generation capacity (in MW's) |  |  | 45 |  |  |
Subsequent Event | Purchase Agreement with Aspen Generating, LLC | AE Supply |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of gas generating plants | Natural_gas_plant | 4 |  | 4 |  |  |
Discharge of note indenture | $ |  |  | $ 305,000,000 |  |  |
Make-whole premiums | $ |  |  | $ 100,000,000 |  |  |
Subsequent Event | Purchase Agreement with Aspen Generating, LLC | AGC |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Plant ownership percentage |  |  | 59.00% |  |  |
Term Loan |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Face amount of loan | $ |  |  |  | $ 1,200,000,000.0 |  | $ 1,000,000,000
Debt Instrument, Term |  |  |  | 5 years |  |
Term Loan | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Debt Instrument, Number of Agreements | agreement |  | 2 |  |  |  |
Bank of America N.A. | $125M Term Loan | Term Loan | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Face amount of loan | $ |  | $ 125,000,000 |  |  |  |
Debt Instrument, Term |  | 3 years |  |  |  |
The Bank of Nova Scotia | $125M Term Loan | Term Loan | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Face amount of loan | $ |  | $ 125,000,000 |  |  |  |
Debt Instrument, Term |  | 3 years |  |  |  |

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