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Debt (2016 Credit Facility - Narrative) (Details)
1 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2016
USD ($)
Dec. 31, 2013
USD ($)
Debt Instrument [Line Items]            
Debt instrument   $ 4,408,000,000     $ 4,684,000,000  
Long-term Debt [Member]            
Debt Instrument [Line Items]            
Debt instrument   4,368,000,000     4,643,000,000  
Long-term Debt [Member] | 2013 Credit Facility [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 66,000,000         $ 2,000,000,000
Repayment of line of credit 285,000,000          
Amount outstanding   0        
Long-term Debt [Member] | 2016 Credit Facility [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity 743,000,000          
Long-term Debt [Member] | 2013 & 2016 Credit Facilities [Member]            
Debt Instrument [Line Items]            
Amount outstanding   0        
Long-term Debt [Member] | Letter of Credit [Member]            
Debt Instrument [Line Items]            
Amount outstanding   $ 326,000,000        
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 1,934,000,000          
Maturity date, year and month 2020-12          
Incremental increase EBITDAX to interest expense ratio   0.25        
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
EBITDAX to interest expense ratio   1.00        
Liquidity requirement   $ 300,000,000        
Anti-hoarding provision, required unrestricted cash   $ 100,000,000        
Collateral coverage ratio   1.50        
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Minimum [Member] | Scenario, Forecast [Member]            
Debt Instrument [Line Items]            
EBITDAX to interest expense ratio     1.50 1.50    
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Liquidity requirement   $ 500,000,000        
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Eurodollar [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Basis points   1.75%        
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Eurodollar [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Basis points   2.50%        
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Base Rate [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Basis points   0.75%        
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Base Rate [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Basis points   1.50%        
Revolving Credit Facility And Term Loan Facility [Member] | Long-term Debt [Member] | Over LIBOR [Member]            
Debt Instrument [Line Items]            
Basis points   2.50%        
Term Loan 2 due December 2020 [Member] | Long-term Debt [Member]            
Debt Instrument [Line Items]            
Debt instrument $ 1,191,000,000 $ 1,191,000,000     $ 1,191,000,000  
Maturity date, year and month   2020-12     2020-12  
Accelerated maturity date, year and month if not amended, redeemed or refinanced   2019-10        
2020 Senior Notes [Member] | Long-term Debt [Member]            
Debt Instrument [Line Items]            
Maturity date, year and month   2020-01     2020-01  
Amount to be amended, redeemed or refinanced to avoid acceleration   $ 765,000,000     $ 765,000,000