Divestitures (Details) - Subsequent Event [Member] $ in Millions |
3 Months Ended | |
|---|---|---|
|
Sep. 30, 2019
USD ($)
|
Apr. 08, 2019
MW
|
|
| Garrison Energy Center and RockGen Energy LLC [Member] | ||
| Business Acquisition [Line Items] | ||
| Ownership percentage of acquiree | 100.00% | |
| Proceeds from Sale of Productive Assets | $ | $ 360 | |
| Garrison Energy Center LLC [Member] | ||
| Business Acquisition [Line Items] | ||
| Power generation capacity | 309 | |
| RockGen Energy LLC [Member] | ||
| Business Acquisition [Line Items] | ||
| Power generation capacity | 503 |