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Commitments and Contingencies (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 01, 2001 | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2018 facility | Aug. 18, 2016 USD ($)
Commonwealth Edison Company And Exelon Generation Company LLC |  |  |  |  |
Loss Contingencies |  |  |  |  |
Payment for litigation settlement |  | $ 26.0 |  |  |
CDWR and SDGE v Sunrise Power |  |  |  |  |
Loss Contingencies |  |  |  |  |
PPA period | 10 years |  |  |  |
Damages sought, amount |  |  | $ 1.2 |  |
Remaining term |  |  | 70 months |  |
Sierra Club Et Al V. Midwest Generation LLC |  |  |  |  |
Loss Contingencies |  |  |  |  |
Number of facilities | facility |  |  |  | 4 |
Lignite Contract With Texas Westmoreland Coal Co. |  |  |  |  |
Loss Contingencies |  |  |  |  |
Bond obligation |  |  |  |  | $ 99.0

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