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Litigation and Environmental Federal Energy Regulatory Commission Proceedings (Details) - Federal Energy Regulatory Commission [Member] - Unfavorable Regulatory Action [Member] - Pending Litigation [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) claims
EPNG |
Loss Contingencies [Line Items] |
Loss Contingency, Pending Claims, Number | claims | 2
Reparations, Refunds and Rate Reductions [Member] | SFPP |
Loss Contingencies [Line Items] |
Loss Contingency Period of Time Litigation Concerns | 2 years
Annual Rate Reductions [Member] | SFPP |
Loss Contingencies [Line Items] |
Loss Contingency, Damages Sought, Value | $ 50
Revenue Subject to Refund [Member] | SFPP |
Loss Contingencies [Line Items] |
Loss Contingency, Damages Sought, Value | $ 400

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