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Commitments, Contingencies And Uncertainties Narrative (Details)
Sep. 30, 2018
Loss Contingencies [Line Items]  
Number of criteria emissions established under the Clear Air Act 6
Maximum  
Loss Contingencies [Line Items]  
Public Utilities, Government Standard Emission Limit 75
Minimum  
Loss Contingencies [Line Items]  
Public Utilities, Government Standard Emission Limit 70