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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, 2020
Dec. 31, 2019
Dec. 31, 2018
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 $ 19 $ 21 $ 7
Crude oil, petroleum products and freight rates activities | Trading & Shipping | Maximum      
Market related risk      
Value at risk 30 28 21
Crude oil, petroleum products and freight rates activities | Trading & Shipping | Minimum      
Market related risk      
Value at risk 6 9 5
Crude oil, petroleum products and freight rates activities | Trading & Shipping | Average      
Market related risk      
Value at risk $ 15 $ 17 $ 12
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 $ 27 $ 64 $ 10
Integrated Gas, Renewables & Power activities | Integrated Gas, Renewables and Power | Maximum      
Market related risk      
Value at risk 51 83 20
Integrated Gas, Renewables & Power activities | Integrated Gas, Renewables and Power | Minimum      
Market related risk      
Value at risk 6 10 3
Integrated Gas, Renewables & Power activities | Integrated Gas, Renewables and Power | Average      
Market related risk      
Value at risk $ 21 $ 20 $ 10