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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
May 04, 2021
Mar. 31, 2021
Mar. 31, 2020
Jan. 07, 2021
Dec. 31, 2020
Stockholders Equity [Abstract]          
Common stock converted to right to receive share       0.5165  
Common stock, shares issued (in shares)   675,000,000     382,000,000
Dividends rate per share   $ 0.30      
Fixed Dividend [Member]          
Stockholders Equity [Abstract]          
Dividends rate per share   0.11 $ 0.09    
Variable Dividend [Member]          
Stockholders Equity [Abstract]          
Dividends rate per share   $ 0.19      
Dividends amount   $ 127      
Subsequent Event          
Stockholders Equity [Abstract]          
Dividends rate per share $ 0.34        
Dividends payable, year 2021        
Subsequent Event | Fixed Dividend [Member]          
Stockholders Equity [Abstract]          
Dividends amount $ 74        
Dividends rate per share $ 0.11        
Subsequent Event | Variable Dividend [Member]          
Stockholders Equity [Abstract]          
Dividends rate per share $ 0.23        
Dividends amount $ 155        
Devon and WPX Agreement [Member]          
Stockholders Equity [Abstract]          
Common stock, shares issued (in shares)       289,900,000