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Changes in Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 50,202 $ 44,276 $ 45,406 $ 29,849
Net Income 4,527 2,379 15,431 5,452
Other comprehensive income (loss) (552) (203) (915) 95
Dividends declared, ordinary (588) (1,188) (1,789) (2,359)
Dividends declared, variable return of cash (1,754)   (3,040)  
Repurchase of company common stock (2,799) (1,243) (6,524) (2,224)
Distributed under benefit plans 44 94 508 176
Acquisition of Concho       13,125
Other (1)   2 1
Ending Balance $ 49,079 $ 44,115 $ 49,079 $ 44,115
Dividends declared, ordinary (in dollars per share) $ 0.46 $ 0.89 $ 1.38 $ 1.75
Dividends declared, variable return of cash (in dollars per share) $ 1.40   $ 2.40  
Par Value        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 21 $ 21 $ 21 $ 18
Acquisition of Concho       3
Ending Balance 21 21 21 21
Capital in Excess of Par        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 61,045 60,337 60,581 47,133
Distributed under benefit plans 44 94 508 176
Acquisition of Concho       13,122
Ending Balance 61,089 60,431 61,089 60,431
Treasury Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (54,644) (48,278) (50,920) (47,297)
Repurchase of company common stock (2,799) (1,243) (6,524) (2,224)
Other (1)    
Ending Balance (57,444) (49,521) (57,444) (49,521)
Accum. Other Comprehensive Income (Loss)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (5,313) (4,920) (4,950) (5,218)
Other comprehensive income (loss) (552) (203) (915) 95
Ending Balance (5,865) (5,123) (5,865) (5,123)
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 49,093 37,116 40,674 35,213
Net Income 4,527 2,379 15,431 5,452
Dividends declared, ordinary (588) (1,188) (1,789) (2,359)
Dividends declared, variable return of cash (1,754)   (3,040)  
Other   2 1
Ending Balance $ 51,278 $ 38,307 $ 51,278 $ 38,307