XML 47 R37.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Derivative Instruments and Hedging Activities - Outstanding Commodity Derivatives (Details) Bcf in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 $ / Mcf Bcf
Natural gas (Leidy) |
Derivative [Line Items] |
Volume (in Bcf for gas and mmbbls for oil) | Bcf | 17.9
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 | 16.0
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 | 46.5
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 | 6.0
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 | 6.0
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf | 3.67

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix: | us-gaap_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition Average fixed price related to the group of price risk swap derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeSwapTypeAverageFixedPrice
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cog_NaturalGasSwapWithContractPeriodOfApril2018ToDecember2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cog_NaturalGasSwap1WithContractPeriodOfApril2018ToDecember2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cog_NaturalGasCollarWithContractPeriodOfApril2018ToDecember2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cog_NaturalGasCollarWithContractPeriodOfApril2018ToOctober2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cog_NaturalGasPurchaseWithContractPeriodOfApril2018ToOctober2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |