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Stockholders' Equity (Narrative) (Details)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended
Feb. 28, 2022
USD ($)
Nov. 02, 2021
USD ($)
Jan. 07, 2021
May 31, 2022
USD ($)
$ / shares
Mar. 31, 2022
$ / shares
shares
Mar. 31, 2021
$ / shares
Dec. 31, 2021
shares
Stockholders Equity [Abstract]              
Common stock, shares issued (in shares) | shares         661   663
Dividends rate per share         $ 1.00 $ 0.30  
Fixed Dividend [Member]              
Stockholders Equity [Abstract]              
Percentage Increase In Quarterly Dividend         45.00%    
Dividends rate per share         $ 0.16    
Subsequent Event              
Stockholders Equity [Abstract]              
Dividend payable, per share       $ 1.27      
Dividends payable, year       2022      
Subsequent Event | Fixed Dividend [Member]              
Stockholders Equity [Abstract]              
Dividend payable amount | $       $ 106      
Dividends rate per share       $ 0.16      
Subsequent Event | Variable Dividend [Member]              
Stockholders Equity [Abstract]              
Dividend payable, per share       $ 1.11      
Dividend payable amount | $       $ 732      
Devon and WPX Agreement [Member]              
Stockholders Equity [Abstract]              
Conversion of common stock into right to recieve per share     0.5165        
Share Repurchase Program [Member]              
Stockholders Equity [Abstract]              
Repurchase of common stock | $ $ 1,600 $ 1,000   $ 2,000      
Repurchase program expiration date May 31, 2022 Dec. 31, 2022   May 04, 2023