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Litigation, Environmental and Other Contingencies Federal Energy Regulatory Commission Proceedings (Details) - Federal Energy Regulatory Commission [Member] - Various Shippers [Member] - Unfavorable Regulatory Action [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
EPNG [Member] | Opinion 517 issued and implemented (rehearing pending); and Opinion 528 issued. [Member] |
EPNG [Abstract] |
Loss Contingency, Pending Claims, Number | 2
Repreations, Refunds, and Rate Reductions [Member] | SFPP [Member] | Pending Litigation [Member] |
Loss Contingencies [Line Items] |
Loss Contingency Period of Time Litigation Concerns | 2 years
Annual Rate Reductions [Member] | SFPP [Member] | Pending Litigation [Member] |
SFPP [Abstract] |
Loss Contingency, Damages Sought, Value | $ 40
Revenue Subject to Refund [Member] | SFPP [Member] | Pending Litigation [Member] |
SFPP [Abstract] |
Loss Contingency, Damages Sought, Value | $ 230

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