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Derivative Instruments and Hedging Activities - Outstanding Commodity Derivatives (Details) Bcf in Millions | 9 Months Ended
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Sep. 30, 2018 $ / Mcf Bcf
Natural gas (Leidy) |
Derivative [Line Items] |
Volume (in Bcf for gas and mmbbls for oil) | Bcf | 8.9
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf | (0.69)
Natural gas (Leidy) |
Derivative [Line Items] |
Volume (in Bcf for gas and mmbbls for oil) | Bcf | 53.2
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf | (0.55)
Natural gas (Transco) |
Derivative [Line Items] |
Volume (in Bcf for gas and mmbbls for oil) | Bcf | 13.3
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 | 23.2
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 | 1.5
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf | 3.10

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