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Commitments And Contingencies (Details) - Maximum [Member] - 2015 Washington General Rate Case [Member] $ in Millions | Mar. 31, 2019 USD ($)
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Loss Contingencies [Line Items] |
Loss Contingency, Estimated Potential Loss | $ 35.2
Electric [Member] |
Loss Contingencies [Line Items] |
Loss Contingency, Estimated Potential Loss | 28.3
Natural Gas [Member] |
Loss Contingencies [Line Items] |
Loss Contingency, Estimated Potential Loss | $ 6.9

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