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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, 2018
Dec. 31, 2017
Dec. 31, 2016
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 $ 7.0 $ 7.0 $ 22.0
Trading & Shipping | High      
Market related risk      
Value at risk 21.0 28.0 25.0
Trading & Shipping | Low      
Market related risk      
Value at risk 5.0 4.0 7.0
Trading & Shipping | Average      
Market related risk      
Value at risk $ 12.0 $ 16.0 $ 14.0
Gas, Renewables & 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 $ 10.0 $ 4.0 $ 2.0
Gas, Renewables & Power | High      
Market related risk      
Value at risk 20.0 13.0 8.0
Gas, Renewables & Power | Low      
Market related risk      
Value at risk 3.0 3.0 2.0
Gas, Renewables & Power | Average      
Market related risk      
Value at risk $ 10.0 $ 6.0 $ 4.0