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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, 2017
Dec. 31, 2016
Dec. 31, 2015
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 $ 6.6 $ 22.1 $ 7.4
Trading & Shipping | High      
Market related risk      
Value at risk 28.4 24.6 11.6
Trading & Shipping | Low      
Market related risk      
Value at risk 4.1 7.2 5.5
Trading & Shipping | Average      
Market related risk      
Value at risk $ 15.6 $ 14.0 $ 8.6
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 $ 4.2 $ 2.1 $ 8.0
Gas, Renewables & Power | High      
Market related risk      
Value at risk 12.5 8.4 15.8
Gas, Renewables & Power | Low      
Market related risk      
Value at risk 2.8 2.0 2.0
Gas, Renewables & Power | Average      
Market related risk      
Value at risk $ 6.3 $ 3.9 $ 7.1