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Subsequent Event (Details) (Cline And Midland-Wolfcamp Shale Plays [Member], USD $)
In Millions, unless otherwise specified |
1 Months Ended |
|---|---|
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Aug. 31, 2012
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| Subsequent Event [Line Items] | |
| Subsequent Event, Date | August 2012 |
| Subsequent Event, Percentage of Interest Sold | 30.00% |
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Sold Interest And Future Drilling Costs [Member]
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| Subsequent Event [Line Items] | |
| Subsequent Event, Cash Received | 1,365 |
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Sold Interest [Member]
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|
| Subsequent Event [Line Items] | |
| Subsequent Event, Cash Received | 340 |
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Future Drilling Costs [Member]
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|
| Subsequent Event [Line Items] | |
| Subsequent Event, Cash Received | 1,025 |