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Stockholders' Equity (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jul. 01, 2021
USD ($)
$ / shares
Jan. 07, 2021
shares
Jun. 30, 2021
$ / shares
shares
Mar. 31, 2021
$ / shares
Jun. 30, 2020
$ / shares
Mar. 31, 2020
$ / shares
Jun. 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     $ 0.34 $ 0.30 $ 0.11 $ 0.09    
Subsequent Event                
Stockholders Equity [Abstract]                
Dividend payable, per share $ 0.49              
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 $ 0.38              
Dividend payable amount | $ $ 257              
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