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Financial instruments related to commodity contracts - Market related risks (Details) - Financial instruments related to commodity contracts - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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 $ 21.0 $ 7.0 $ 7.0
Crude oil, petroleum products and freight rates activities | Trading & Shipping | High      
Market related risk      
Value at risk 28.0 21.0 28.0
Crude oil, petroleum products and freight rates activities | Trading & Shipping | Low      
Market related risk      
Value at risk 9.0 5.0 4.0
Crude oil, petroleum products and freight rates activities | Trading & Shipping | Average      
Market related risk      
Value at risk $ 17.0 $ 12.0 $ 16.0
Integrated Gas, Renewables & Power activities | Integrated Gas, Renewables and 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 $ 64.0 $ 10.0 $ 4.0
Integrated Gas, Renewables & Power activities | Integrated Gas, Renewables and Power | High      
Market related risk      
Value at risk 83.0 20.0 13.0
Integrated Gas, Renewables & Power activities | Integrated Gas, Renewables and Power | Low      
Market related risk      
Value at risk 10.0 3.0 3.0
Integrated Gas, Renewables & Power activities | Integrated Gas, Renewables and Power | Average      
Market related risk      
Value at risk $ 20.0 $ 10.0 $ 6.0