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Long-Term Debt (Narrative) (Details) (USD $)
Share data in Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Pioneer Credit Facility [Member]
Rate
Dec. 31, 2012
Pioneer Credit Facility [Member]
Dec. 31, 2013
Pioneer Southwest Credit Facility [Member]
Dec. 31, 2012
Pioneer Southwest Credit Facility [Member]
Dec. 31, 2013
Swing Line Loans [Member]
Pioneer Credit Facility [Member]
Jun. 30, 2012
3.95% Senior Notes Due 2022 [Member]
Rate
Dec. 31, 2013
3.95% Senior Notes Due 2022 [Member]
Rate
Dec. 31, 2012
3.95% Senior Notes Due 2022 [Member]
Jun. 30, 2013
2.875% Convertible Senior Notes Due 2038 [Member]
Dec. 31, 2013
2.875% Convertible Senior Notes Due 2038 [Member]
Rate
Dec. 31, 2012
2.875% Convertible Senior Notes Due 2038 [Member]
Dec. 31, 2011
2.875% Convertible Senior Notes Due 2038 [Member]
Dec. 31, 2013
Total Debt To Book Capitalization [Member]
Pioneer Credit Facility [Member]
Line of credit facility, maximum borrowing capacity       $ 1,500,000,000   $ 300,000,000                    
Maximum outstanding borrowings under the Credit Facility               150,000,000                
Federal fund rate       0.50%                        
Alternate base rate spread       0.50%                        
Applicable margin       1.50%                        
Letters of credit outstanding under the Credit Facility, interest percentage       0.125%                        
Unused portion, fee percentage       0.25%                        
Debt instrument covenant description                               .60
Unamortized Debt Issuance Expense 861,000                              
Issuance of senior notes                 600,000,000 600,000,000 600,000,000          
Senior Notes, interest rate, percentage                 3.95% 3.95%     2.875%      
Senior notes offering discounts and cost                 8,500,000              
Borrowings under long-term debt 466,864,000 1,776,618,000 196,616,000           591,500,000              
Convertible debt                         0 479,907,000    
Principal amount of notes tendered for conversion                       479,100,000        
Cash Paid To Conversion Of Convertible Senior Notes                       479,100,000        
Shares received for conversion of debt                       4.4        
Cash Paid To Redeem Convertible Debt                       845,000        
Interest expense relating to the contractual interest coupon and unamortized discount                         9,400,000 33,500,000 32,300,000  
Debt instrument, effective interest rate, percentage                         6.75%      
Outstanding borrowings under the Credit Facility       $ 0 $ 474,000,000 $ 0 $ 126,000,000