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Commitments and Contingencies - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) facility | Dec. 31, 2019 USD ($) case | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |
Nuclear insurance liability limit per incident |  | $ 13,900,000 |
Required nuclear liability insurance |  | 450,000 |
Nuclear financial protection pool mandated by the Price-Anderson Act |  | 13,500,000 |
Maximum assessment mandated by Price-Anderson Act per nuclear reactor for a nuclear incident |  | $ 138,000 |
Maximum assessment, administrative fee (as percent) |  | 5.00% |
Maximum assessment payment mandated by Price-Anderson Act for a nuclear incident |  | $ 21,000 |
Maximum assessment |  | 44.00% |
Nuclear operator maximum annual assessment |  | $ 9,000 |
Maximum liability per nuclear incident |  | 61,000 |
Mutual property insurance additional blanket policy property coverage |  | 1,250,000 |
Nuclear property insurance coverage limit per individual insured |  | 1,500,000 |
Lost revenue insurance maximum weekly recovery |  | 2,500 |
Accidental outage weekly recovery limit for loss revenues from a nuclear industry mutual insurance company in the event of insurable loss |  | $ 1,980 |
The number of months a nuclear industry mutual insurance company will respond to retrospective premium adjustments |  | 24 months |
Number of years board of directors of industry mutual insurance company can adjust policy after policy expires |  | 6 years |
Sierra Club Et Al V. Midwest Generation L L C |  |  |
Loss Contingencies [Line Items] |  |  |
Number of facilities | facility | 4 |  |
Commonwealth Edison Company And Exelon Generation Company LLC |  |  |
Loss Contingencies [Line Items] |  |  |
Financial obligations under agreement | $ 26,000 |  |
XOOM Energy Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Number of class action lawsuits | case |  | 2 |
High |  |  |
Loss Contingencies [Line Items] |  |  |
Multiplier that the industry mutual insurance company may assess against insureds premium |  | 10 |
Low |  |  |
Loss Contingencies [Line Items] |  |  |
Multiplier that the industry mutual insurance company may assess against insureds premium |  | 6 |
Nuclear Event |  |  |
Loss Contingencies [Line Items] |  |  |
Total nuclear property insurance coverage |  | $ 2,750,000 |
Lost revenue insurance maximum weekly recovery |  | 274,000 |
Accidental outage weekly recovery limit for loss revenues from a nuclear industry mutual insurance company in the event of insurable loss |  | 216,000 |
Non-nuclear Event |  |  |
Loss Contingencies [Line Items] |  |  |
Total nuclear property insurance coverage |  | 1,000,000 |
Lost revenue insurance maximum weekly recovery |  | 184,000 |
Accidental outage weekly recovery limit for loss revenues from a nuclear industry mutual insurance company in the event of insurable loss |  | $ 144,000 |
Lignite Contract with Texas Westmoreland Coal Co. |  |  |
Loss Contingencies [Line Items] |  |  |
Bond obligation |  |  | $ 99,000

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- Definition Maximum assessment to be paid per nuclear reactor for a nuclear incident under the financial protection pool mandated by the Price-Anderson Act. This assessment is paid by each United State nuclear reactor operator over multiple years at a limited amount per year in the event of an incident at any US nuclear reactor. + References No definition available. + Details
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