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Derivative Instruments and Hedging Activities - Outstanding Commodity Derivatives (Details) Bcf in Millions | 3 Months Ended
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Mar. 31, 2018 $ / Mcf Bcf
Natural gas (Leidy) |
Derivative [Line Items] |
Volume (in Bcf for gas and mmbbls for oil) | Bcf | 26.7
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf | (0.69)
Natural gas (Transco) |
Derivative [Line Items] |
Volume (in Bcf for gas and mmbbls for oil) | Bcf | 18.7
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf | 0.42
Natural gas (NYMEX) |
Derivative [Line Items] |
Volume (in Bcf for gas and mmbbls for oil) | Bcf | 69.5
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf | 2.93
Natural gas (NYMEX) |
Derivative [Line Items] |
Volume (in Bcf for gas and mmbbls for oil) | Bcf | 10.4
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf | 3.10
Natural gas purchase |
Derivative [Line Items] |
Volume (in Bcf for gas and mmbbls for oil) | Bcf | 0.0
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf | 3.67

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