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Main items related to operating activities - Inventories, Components (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Main items related to operating activities        
Turnover period for petroleum product inventories 2 months      
Inventories        
Crude oil and natural gas $ 2,658 $ 2,208 $ 1,729  
Refined products 5,792 4,547 4,047  
Chemicals products 1,031 819 917  
Trading inventories 4,320 4,613 3,168  
Other inventories 2,719 3,060 3,255  
Total 16,520 15,247 13,116  
Gross value/Cost        
Inventories        
Crude oil and natural gas 2,658 2,215 1,788  
Refined products 5,828 4,577 4,177  
Chemicals products 1,089 877 989  
Trading inventories 4,320 4,613 3,168  
Other inventories 3,632 3,936 4,062  
Total 17,527 16,218 14,184  
Valuation allowance/Cumulative impairments        
Inventories        
Crude oil and natural gas   (7) (59)  
Refined products (36) (30) (130)  
Chemicals products (58) (58) (72)  
Other inventories (913) (876) (807)  
Total $ (1,007) $ (971) $ (1,068) $ (1,395)