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Stockholders' Equity (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Nov. 02, 2021
USD ($)
$ / shares
Jan. 07, 2021
shares
Sep. 30, 2021
$ / shares
shares
Jun. 30, 2021
$ / shares
Mar. 31, 2021
$ / shares
Sep. 30, 2020
$ / shares
Jun. 30, 2020
$ / shares
Mar. 31, 2020
$ / shares
Sep. 30, 2021
shares
Dec. 31, 2020
shares
Stockholders Equity [Abstract]                    
Conversion of common stock into right to recieve per share   0.5165             0.5165  
Common stock, shares issued (in shares) | shares     677,000,000           677,000,000 382,000,000
Dividends rate per share     $ 0.49 $ 0.34 $ 0.30 $ 0.11 $ 0.11 $ 0.09    
Subsequent Event                    
Stockholders Equity [Abstract]                    
Repurchase of common stock | $ $ 1,000                  
Repurchase program expiration date Dec. 31, 2022                  
Dividend payable, per share $ 0.84                  
Dividends payable, year 2021                  
Subsequent Event | Fixed Dividend [Member]                    
Stockholders Equity [Abstract]                    
Dividend payable amount | $ $ 74                  
Dividends rate per share $ 0.11                  
Subsequent Event | Variable Dividend [Member]                    
Stockholders Equity [Abstract]                    
Dividend payable, per share $ 0.73                  
Dividend payable amount | $ $ 494                  
Devon and WPX Agreement [Member]                    
Stockholders Equity [Abstract]                    
Conversion of common stock into right to recieve per share   0.5165                
Common stock, shares issued (in shares) | shares   290,000,000 289,900,000           289,900,000