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Natural Gas and Oil Property Divestitures - Narrative (Details) (USD $)
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3 Months Ended | 6 Months Ended | |
|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Business Acquisition [Line Items] | |||
| Proceeds from divestitures of proved and unproved properties | $ 248,000,000 | $ 1,895,000,000 | |
| Proceeds from Divestiture of Interest in Joint Venture | 8,049,000,000 | ||
| Total Drilling Carries | 9,035,000,000 | ||
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Corporate Joint Venture [Member]
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| Business Acquisition [Line Items] | |||
| Proceeds from divestitures of proved and unproved properties | 240,000,000 | 815,000,000 | |
| Number of Joint Ventures | 8 | ||
| Number of Resource Plays | 8 | ||
| Proceeds from Divestiture of Interest in Joint Venture | 8,000,000,000 | ||
| Oil And Gas Benefit From Drilling Carries | 436,000,000 | 357,000,000 | |
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JV Marcellus, Barnett and Utica [Member]
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| Business Acquisition [Line Items] | |||
| Proceeds from Divestiture of Interest in Joint Venture | 39,000,000 | 8,000,000 | |
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Corporate VPP [Member]
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| Business Acquisition [Line Items] | |||
| Gain (Loss) on Disposition of Other Assets | $ 0 | ||