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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 Exploracion y 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