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Derivative and Hedging Activities - Fair Value of Recurring Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative assets (liabilities), at fair value, net $ (166) $ 130    
Commodity contract        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative asset 14 174    
Derivative liability (180) (44)    
Quoted Prices in Active Markets (Level 1)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative assets (liabilities), at fair value, net 0 0    
Quoted Prices in Active Markets (Level 1) | Commodity contract        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative asset 0 0    
Derivative liability 0 0    
Significant Other Observable Inputs (Level 2)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative assets (liabilities), at fair value, net (166) 118    
Significant Other Observable Inputs (Level 2) | Commodity contract        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative asset 14 160    
Derivative liability (180) (42)    
Significant Unobservable Inputs (Level 3)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative assets (liabilities), at fair value, net 0 12    
Significant Unobservable Inputs (Level 3) | Commodity contract        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative asset 0 14    
Derivative liability 0 (2)    
Derivative assets (liabilities), at fair value, net $ 0 $ 12 $ 32 $ 87