Derivative Financial Instruments - Summary of Outstanding Oil and Gas Derivative Contracts and Weighted Average Oil and Gas Prices (Details) - Forecast - Crude Oil (MBbls)	Dec. 31, 2017 MBbls $ / MBbls	Dec. 31, 2016 MBbls $ / MBbls
Basis Swap Contracts
Derivative [Line Items]
Price differential ($/Bbl) \| $ / MBbls	(1.03)	(0.87)
Midland-Cushing Index \| Basis Swap Contracts
Derivative [Line Items]
Notional \| MBbls	4,290	1,516
Purchased \| Put Option
Derivative [Line Items]
Notional \| MBbls	4,134	5,875
Weighted average strike price \| $ / MBbls	46.88	49.78
Short \| Put Option
Derivative [Line Items]
Notional \| MBbls	(4,134)	(5,875)
Weighted average strike price \| $ / MBbls	32.96	35.47

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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- Definition

The average strike price on the group of price risk option contracts such as put options or call options.

+ References

No definition available.

+ Details

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- 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

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- Definition

Average fixed price related to the group of price risk swap derivatives.

+ References

No definition available.

+ Details

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- Details

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- Details

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