v3.26.1
Financial instruments related to commodity contracts - Markets related risks (Details) - Derivative financial instruments related to commodity contracts - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Gas & Power activities | Gas & Power      
Market related risk      
Period of possible future changes in market values 1 day    
Historical period analysed in value-at-risk models 2 years    
Confidence level (as a percent) 97.50% 97.50% 97.50%
Value at risk $ 36 $ 77 $ 54
Gas & Power activities | Gas & Power | Maximum      
Market related risk      
Value at risk 108 139 111
Gas & Power activities | Gas & Power | Minimum      
Market related risk      
Value at risk 11 19 16
Gas & Power activities | Gas & Power | Average      
Market related risk      
Value at risk $ 38 $ 54 $ 54
Crude oil, petroleum products and freight rates activities | Trading & Shipping      
Market related risk      
Period of possible future changes in market values 1 day    
Historical period analysed in value-at-risk models 400 days    
Confidence level (as a percent) 97.50% 97.50% 97.50%
Period to exceed value-at-risk loss measure if exposure is unchanged 40 days    
Value at risk $ 13 $ 16 $ 28
Crude oil, petroleum products and freight rates activities | Trading & Shipping | Maximum      
Market related risk      
Value at risk 41 53 74
Crude oil, petroleum products and freight rates activities | Trading & Shipping | Minimum      
Market related risk      
Value at risk 11 8 17
Crude oil, petroleum products and freight rates activities | Trading & Shipping | Average      
Market related risk      
Value at risk $ 20 $ 24 $ 37