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Additional information about derivatives financial instruments - Freight derivative positions (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
$ / d
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Derivative financial instruments.      
Financial settlement inflows (outflows) $ (67) $ (240) $ (1,602)
Freight forwards      
Derivative financial instruments.      
Notional amount (days) 480 days    
Average strike price per day | $ / d 14,509    
Fair value of assets $ 1    
Financial settlement inflows (outflows) (3)    
Freight forwards | 2019      
Derivative financial instruments.      
Fair value of assets $ 1