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Litigation and Environmental - Federal Energy Regulatory Commission Proceedings (Details) - Federal Energy Regulatory Commission - Unfavorable Regulatory Action - Pending Litigation $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) claims
SFPP | Rate Refunds, and Reductions Not Resolved in East Line Settlement |
Loss Contingencies [Line Items] |
Loss Contingency, Damages Sought, Value | $ | $ 50
EPNG |
Loss Contingencies [Line Items] |
Loss Contingency, Pending Claims, Number | claims | 2
Reparations, Refunds and Rate Reductions | SFPP |
Loss Contingencies [Line Items] |
Loss Contingency Period of Time Litigation Concerns | 2 years

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