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Derivative Instruments and Hedging Activities - Outstanding Commodity Derivatives (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2019 $ / Mcf Bcf | Dec. 31, 2018 $ / Mcf Bcf
Natural gas (IFERC TRANSCO Z6 non-NY) |  |
Derivative [Line Items] |  |
Volume (Mmbtu) | Bcf |  | 10,950,000
Natural gas (IFERC TRANSCO Z6 non-NY) |  |
Derivative [Line Items] |  |
Volume (Mmbtu) | Bcf |  | 11,700,000
Swaps Weighted Average (in usd per Mmbtu) | $ / Mcf |  | 7.38
Natural gas (IFERC TRANSCO Leidy Line Receipts) |  |
Derivative [Line Items] |  |
Volume (Mmbtu) | Bcf |  | 54,750,000
Natural gas (NYMEX) |  |
Derivative [Line Items] |  |
Volume (Mmbtu) | Bcf |  | 4,500,000
Swaps Weighted Average (in usd per Mmbtu) | $ / Mcf |  | 4.31
Natural gas (NYMEX) |  |
Derivative [Line Items] |  |
Volume (Mmbtu) | Bcf |  | 10,700,000
Swaps Weighted Average (in usd per Mmbtu) | $ / Mcf |  | 2.75
Natural gas (NYMEX) |  |
Derivative [Line Items] |  |
Volume (Mmbtu) | Bcf |  | 109,500,000
Swaps Weighted Average (in usd per Mmbtu) | $ / Mcf |  | 3.13
Weighted Average | Natural gas (IFERC TRANSCO Z6 non-NY) |  |
Derivative [Line Items] |  |
Swaps Weighted Average (in usd per Mmbtu) | $ / Mcf |  | 0.41
Weighted Average | Natural gas (IFERC TRANSCO Leidy Line Receipts) |  |
Derivative [Line Items] |  |
Swaps Weighted Average (in usd per Mmbtu) | $ / Mcf |  | (0.53)
Subsequent Event | Natural gas (NYMEX) |  |
Derivative [Line Items] |  |
Volume (Mmbtu) | Bcf | 42,800,000 |
Swaps Weighted Average (in usd per Mmbtu) | $ / Mcf | 2.86 |

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