v3.25.4
Equity (Details)
$ / shares in Units, $ in Millions
 12 Months Ended 162 Months Ended
Feb. 11, 2026
$ / shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2018
USD ($)
transaction
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Oct. 25, 2023
USD ($)
Class of Stock [Line Items]                
Preferred stock authorized, shares (in shares) | shares   500,000,000         500,000,000  
Par value of preferred stock, per share (in dollars per share) | $ / shares   $ 0.01         $ 0.01  
Preferred stock outstanding, shares (in shares) | shares   0         0  
Repurchase of common stock (in shares) | shares   9,657,680 24,217,484 37,847,772        
Cost of shares repurchased | $   $ 1,183 $ 3,409 $ 4,066        
Acquisition of Phillips 66 Partners Common Units Held by Public                
Class of Stock [Line Items]                
Number of shares to be issued (in shares) | shares         41,800,000      
Decrease of treasury stock | $         $ 3,400      
Subsequent Event                
Class of Stock [Line Items]                
Quarterly cash dividend declared (in dollars per share) | $ / shares $ 1.27              
July 2012 Repurchase Plan                
Class of Stock [Line Items]                
Amount authorized for stock repurchase | $               $ 5,000
Cumulative authorized amount | $             $ 25,000  
Repurchase of common stock (in shares) | shares   9,700,000         248,000,000  
Cost of shares repurchased | $   $ 1,200         $ 22,700  
Separately Authorized Share Repurchases In 2014 And 2018                
Class of Stock [Line Items]                
Repurchase of common stock (in shares) | shares           52,400,000    
Cost of shares repurchased | $           $ 4,600    
Number of transactions | transaction           2