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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  | 1 Months Ended
--- | --- | --- | ---
Mar. 31, 2014 PNG Merger | Apr. 30, 2012 Pemex Exploraciony Produccion (PEP) case | Sep. 30, 2013 Consolidated Delaware Action PNG Merger case | Sep. 30, 2013 Consolidated Texas Action PNG Merger case | Oct. 31, 2013 Consolidated Federal Action PNG Merger case
Loss Contingencies |  |  |  |  |
Total number of cases filed |  | 2 |  |  |
Number of cases filed during the period |  |  | 2 | 2 | 4
Settlement payments | $ 0 |  |  |  |

X
- Definition The total number of cases filed as of the date specified. + References No definition available. + Details
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X
- Details
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Period Type: | duration

X
- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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X
- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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