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Derivative Instruments - Outstanding Commodity Derivatives (Details) | 9 Months Ended
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Sep. 30, 2019 MMBTU $ / MMBTU
Natural gas (IFERC TRANSCO Z6 non-NY) |
Derivative [Line Items] |
Volume (in Mmbtu) | MMBTU | 2,760,000
Swaps Weighted Average (in usd per Mmbtu) | $ / MMBTU | 0.41
Natural gas (IFERC TRANSCO Z6 non-NY) |
Derivative [Line Items] |
Volume (in Mmbtu) | MMBTU | 4,650,000
Swaps Weighted Average (in usd per Mmbtu) | $ / MMBTU | 2.61
Natural gas (IFERC TRANSCO Leidy Line Receipts) |
Derivative [Line Items] |
Volume (in Mmbtu) | MMBTU | 13,800,000
Swaps Weighted Average (in usd per Mmbtu) | $ / MMBTU | (0.53)
Natural gas (NYMEX) |
Derivative [Line Items] |
Volume (in Mmbtu) | MMBTU | 10,850,000
Swaps Weighted Average (in usd per Mmbtu) | $ / MMBTU | 2.85
Natural gas (NYMEX) |
Derivative [Line Items] |
Volume (in Mmbtu) | MMBTU | 27,600,000
Swaps Weighted Average (in usd per Mmbtu) | $ / MMBTU | 2.86

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- Definition Nominal energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details
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