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Litigation, Environmental and Other Contingencies Federal Energy Regulatory Commission Proceedings (Details) (Various Shippers [Member], Unfavorable Regulatory Action [Member], Federal Energy Regulatory Commission [Member], Regulated Operation [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended | ||||
|---|---|---|---|---|---|
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Mar. 31, 2014
Repreations, Refunds, and Rate Reductions [Member]
Pending Litigation [Member]
SFPP [Member]
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Mar. 31, 2014
Annual Rate Reductions [Member]
Pending Litigation [Member]
SFPP [Member]
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Mar. 31, 2014
Revenue Subject to Refund [Member]
Pending Litigation [Member]
SFPP [Member]
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Mar. 31, 2014
2008 rate case and the 2010 rate case [Member]
Opinion 517 issued and implemented (rehearing pending); and Opinion 528 issued and is awaiting filing of court document) [Member]
EPNG [Member]
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Oct. 17, 2013
Pro Forma [Member]
EPNG 2010 Rate Case [Member]
Pending Litigation [Member]
EPNG [Member]
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| Loss Contingencies [Line Items] | |||||
| Loss Contingency, Period of Time Litigation Concerns | 2 years | ||||
| Loss Contingency, Damages Sought, Value | $ 20.00 | $ 100.00 | |||
| Loss Contingency, Pending Claims, Number | 2 | ||||
| Litigation, Court Order, Document Filing Period | 60 days | ||||