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Segment Disclosures and Related Information - Other Segment Disclosure (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Investment in and advances to affiliates $ 8,737 $ 7,991 $ 8,737 $ 7,991  
Total assets 122,472 96,699 122,472 96,699 $ 122,780
Capital expenditures and investments 2,866 2,916 9,530 8,801  
Corporate          
Segment Reporting Information [Line Items]          
Investment in and advances to affiliates 1,624 1,502 1,624 1,502  
Total assets 10,091 10,390 10,091 10,390  
Capital expenditures and investments 27 88 84 433  
Alaska | Operating Segments          
Segment Reporting Information [Line Items]          
Investment in and advances to affiliates 3 33 3 33  
Total assets 19,736 17,401 19,736 17,401  
Capital expenditures and investments 753 691 2,785 2,102  
Lower 48 | Operating Segments          
Segment Reporting Information [Line Items]          
Investment in and advances to affiliates 127 121 127 121  
Total assets 64,387 42,346 64,387 42,346  
Capital expenditures and investments 1,571 1,653 5,089 4,918  
Canada | Operating Segments          
Segment Reporting Information [Line Items]          
Investment in and advances to affiliates 0 0 0 0  
Total assets 9,801 10,072 9,801 10,072  
Capital expenditures and investments 152 136 461 419  
EMENA | Operating Segments          
Segment Reporting Information [Line Items]          
Investment in and advances to affiliates 2,163 1,335 2,163 1,335  
Total assets 10,405 8,161 10,405 8,161  
Capital expenditures and investments 293 248 923 694  
AP | Operating Segments          
Segment Reporting Information [Line Items]          
Investment in and advances to affiliates 4,820 4,993 4,820 4,993  
Total assets 8,052 8,323 8,052 8,323  
Capital expenditures and investments 70 100 188 235  
OI | Operating Segments          
Segment Reporting Information [Line Items]          
Investment in and advances to affiliates 0 7 0 7  
Total assets 0 6 0 6  
Capital expenditures and investments $ 0 $ 0 $ 0 $ 0