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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, 2023
Dec. 31, 2022
Dec. 31, 2021
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 $ 54 $ 92 $ 30
Gas & Power activities | Gas & Power | Maximum      
Market related risk      
Value at risk 111 119 80
Gas & Power activities | Gas & Power | Minimum      
Market related risk      
Value at risk 16 15 9
Gas & Power activities | Gas & Power | Average      
Market related risk      
Value at risk $ 54 $ 53 $ 28
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 $ 28 $ 27 $ 12
Crude oil, petroleum products and freight rates activities | Trading & Shipping | Maximum      
Market related risk      
Value at risk 74 48 36
Crude oil, petroleum products and freight rates activities | Trading & Shipping | Minimum      
Market related risk      
Value at risk 17 9 9
Crude oil, petroleum products and freight rates activities | Trading & Shipping | Average      
Market related risk      
Value at risk $ 37 $ 22 $ 18