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Subsequent Events (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 15, 2021
USD ($)
Feb. 28, 2021
USD ($)
$ / shares
Jan. 31, 2021
USD ($)
Mar. 31, 2021
MBbl_per_day
Mar. 31, 2021
mBOEPD
Dec. 31, 2020
USD ($)
$ / shares
Rate
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Jan. 12, 2021
USD ($)
shares
Dec. 30, 2020
Subsequent Event [Line Items]                    
Dividends declared (usd per share) | $ / shares           $ 2.20 $ 1.20 $ 0.32    
Line of credit facility, maximum borrowing capacity           $ 1,500        
Payments of Debt Issuance Costs           $ 36 $ 0 $ 4    
5.250% Senior Notes due 2025 | Senior notes                    
Subsequent Event [Line Items]                    
Senior Notes, interest rate, percentage                   5.25%
5.375% Senior Notes due 2025 | Senior notes                    
Subsequent Event [Line Items]                    
Senior Notes, interest rate, percentage                   5.375%
5.625% Senior Notes due 2027 | Senior notes                    
Subsequent Event [Line Items]                    
Senior Notes, interest rate, percentage                   5.625%
4.125% Senior Notes due 2028 | Senior notes                    
Subsequent Event [Line Items]                    
Senior Notes, interest rate, percentage                   4.125%
5.875% Senior Notes due 2026 | Senior notes                    
Subsequent Event [Line Items]                    
Senior Notes, interest rate, percentage                   5.875%
3.45% senior notes due 2021                    
Subsequent Event [Line Items]                    
Senior Notes, interest rate, percentage | Rate           3.45%        
3.45% senior notes due 2021 | Senior notes                    
Subsequent Event [Line Items]                    
Senior Notes, interest rate, percentage | Rate           3.45%        
Subsequent event                    
Subsequent Event [Line Items]                    
Dividends declared (usd per share) | $ / shares   $ 0.56                
Line of credit facility, maximum borrowing capacity                 $ 2,000  
Expected Production Loss       30,000,000 55,000,000          
Subsequent event | Senior notes                    
Subsequent Event [Line Items]                    
Payments of Debt Issuance Costs     $ 18              
Proceeds from Debt, Net of Issuance Costs     2,500              
Repayments of Senior Debt     1,600              
Repayments of Debt     $ 852              
Subsequent event | 0.750% Senior Notes Maturing 2024 | Senior notes                    
Subsequent Event [Line Items]                    
Senior Notes, interest rate, percentage     0.75%              
Debt Instrument, Face Amount     $ 750              
Subsequent event | 1.125% Senior Notes Maturing 2026 | Senior notes                    
Subsequent Event [Line Items]                    
Senior Notes, interest rate, percentage     1.125%              
Debt Instrument, Face Amount     $ 750              
Subsequent event | 2.150% Senior Notes Maturing 2031 | Senior notes                    
Subsequent Event [Line Items]                    
Senior Notes, interest rate, percentage     2.15%              
Debt Instrument, Face Amount     $ 1,000              
Subsequent event | 3.45% senior notes due 2021 | Senior notes                    
Subsequent Event [Line Items]                    
Repayments of Senior Debt $ 140                  
Subsequent event | Parsley Energy, Inc.                    
Subsequent Event [Line Items]                    
Number of shares called by each right | shares                 0.1252  
Number of share issued from rights | shares                 52,000,000  
Acquisition related costs                 $ 10  
Minimum | Subsequent event                    
Subsequent Event [Line Items]                    
Monetary sanctions   $ 75                
Maximum | Subsequent event                    
Subsequent Event [Line Items]                    
Monetary sanctions   $ 85