v3.26.1
Financial instruments related to commodity contracts - Changes in fair value (Details) - Derivative financial instruments related to commodity contracts - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financial structure, financial costs and financial instruments      
Fair value as of the beginning of the period $ 1,392 $ (638)  
Fair value as of the end of the period 1,315 1,392 $ (638)
Gas & Power activities      
Financial structure, financial costs and financial instruments      
Fair value as of the beginning of the period 1,730 39 2,347
Impact on income 1,024 (345) (5,792)
Settled contracts (1,094) 2,000 3,681
Other 70 36 (197)
Fair value as of the end of the period 1,730 1,730 39
Crude oil, petroleum products and freight rates activities      
Financial structure, financial costs and financial instruments      
Fair value as of the beginning of the period (338) (677) (901)
Impact on income 10,079 10,118 11,033
Settled contracts (10,124) (9,779) (10,812)
Other (32)   3
Fair value as of the end of the period $ (415) $ (338) $ (677)