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Financial structure and financial costs - Variations of financial debt (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Disclosure of detailed information about financial instruments [line items]  
Balance as of the beginning of the period $ 56,292
Cash changes (4,898)
Non-cash changes, Change in scope, including IFRS 5 reclassifications (69)
Non-cash changes, Foreign currency (460)
Non-cash changes, Changes in fair value (224)
Non-cash changes, Other 938
Balance as of the end of the period 51,579
Non-current financial debt and related financial instruments  
Disclosure of detailed information about financial instruments [line items]  
Balance as of the beginning of the period 42,159
Cash changes 2,277
Non-cash changes, Change in scope, including IFRS 5 reclassifications 2
Non-cash changes, Foreign currency 141
Non-cash changes, Changes in fair value (160)
Non-cash changes, Reclassification Non-current/Current (4,713)
Non-cash changes, Other 955
Balance as of the end of the period 40,661
Non-current financial assets  
Disclosure of detailed information about financial instruments [line items]  
Balance as of the beginning of the period (908)
Non-cash changes, Foreign currency (62)
Non-cash changes, Changes in fair value 291
Balance as of the end of the period (679)
Non-current financial debt  
Disclosure of detailed information about financial instruments [line items]  
Balance as of the beginning of the period 43,067
Cash changes 2,277
Non-cash changes, Change in scope, including IFRS 5 reclassifications 2
Non-cash changes, Foreign currency 203
Non-cash changes, Changes in fair value (451)
Non-cash changes, Reclassification Non-current/Current (4,713)
Non-cash changes, Other 955
Balance as of the end of the period 41,340
Current financial debt and related financial instruments  
Disclosure of detailed information about financial instruments [line items]  
Balance as of the beginning of the period 14,112
Cash changes (7,175)
Non-cash changes, Change in scope, including IFRS 5 reclassifications (50)
Non-cash changes, Foreign currency (601)
Non-cash changes, Changes in fair value (64)
Non-cash changes, Reclassification Non-current/Current 4,713
Non-cash changes, Other (17)
Balance as of the end of the period 10,918
Current financial assets  
Disclosure of detailed information about financial instruments [line items]  
Balance as of the beginning of the period (135)
Non-cash changes, Foreign currency (34)
Non-cash changes, Changes in fair value (254)
Balance as of the end of the period (423)
Current borrowings  
Disclosure of detailed information about financial instruments [line items]  
Balance as of the beginning of the period 13,920
Cash changes (7,175)
Non-cash changes, Change in scope, including IFRS 5 reclassifications (50)
Non-cash changes, Foreign currency (585)
Non-cash changes, Changes in fair value 290
Non-cash changes, Reclassification Non-current/Current 4,713
Non-cash changes, Other (17)
Balance as of the end of the period 11,096
Other current financial liabilities  
Disclosure of detailed information about financial instruments [line items]  
Balance as of the beginning of the period 327
Non-cash changes, Foreign currency 18
Non-cash changes, Changes in fair value (100)
Balance as of the end of the period 245
Financial liabilities classified as held for sale  
Disclosure of detailed information about financial instruments [line items]  
Balance as of the beginning of the period 21
Non-cash changes, Change in scope, including IFRS 5 reclassifications $ (21)