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Related Party Transactions (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]            
Pressure pumping related services charges (a)       $ 238 $ 461  
Accounts receivable - due from affiliate       0 3  
Accounts payable - due to affiliate       45 88  
Revenue - service revenue       7,024 9,671  
Income (loss) before income taxes       (261) 1,008 $ 1,251
Idle frac fleet fees [Member]            
Related Party Transaction [Line Items]            
Pressure pumping related services charges (a)       41 $ 16  
ProPetro            
Related Party Transaction [Line Items]            
Revenue - service revenue   $ 635 $ 1,618      
Costs and expenses   469 1,165      
Income (loss) before income taxes   $ (63) $ 140      
Pressure pumping assets | ProPetro | Sale assets            
Related Party Transaction [Line Items]            
Shares received 16.6          
Short-term receivables       $ 110