v3.21.2
Changes in Equity - Schedule of Changes in Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 43,155 $ 31,387 $ 29,849 $ 35,050
Net income (loss) 2,091 278 3,073 (1,433)
Other Comprehensive Income (Loss) 160 320 298 (468)
Dividends paid (583) (455) (1,171) (913)
Acquisition of Concho     13,125  
Repurchase of company common stock (606)   (981) (726)
Distributions to noncontrolling interests and other   (6)   (32)
Disposition   (84)   (84)
Distributed under benefit plans 59 52 82 96
Other   1 1 3
Ending Balance 44,276 31,493 44,276 31,493
Par Value - Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 21 18 18 18
Acquisition of Concho     3  
Ending Balance 21 18 21 18
Capital in excess of par [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 60,278 47,027 47,133 46,983
Acquisition of Concho     13,122  
Distributed under benefit plans 59 52 82 96
Ending Balance 60,337 47,079 60,337 47,079
Treasury Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (47,672) (47,130) (47,297) (46,405)
Repurchase of company common stock (606)   (981) (726)
Other       1
Ending Balance (48,278) (47,130) (48,278) (47,130)
Accum Other Comprehensive Income (Loss) [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (5,080) (6,145) (5,218) (5,357)
Other Comprehensive Income (Loss) 160 320 298 (468)
Ending Balance (4,920) (5,825) (4,920) (5,825)
Retained Earnings [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 35,608 37,545 35,213 39,742
Net income (loss) 2,091 260 3,073 (1,479)
Dividends paid (583) (455) (1,171) (913)
Other   1 1 1
Ending Balance $ 37,116 37,351 $ 37,116 37,351
Noncontrolling Interests [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance   72   69
Net income (loss)   18   46
Distributions to noncontrolling interests and other   (6)   (32)
Disposition   (84)   (84)
Other       1
Ending Balance   $ 0   $ 0