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Financial structure and financial costs - Loan repayment schedule (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 41,340 $ 43,067 $ 44,464
Non-current financial assets (679) (908) (1,219)
Non-current financial debt and related financial instruments $ 40,661 $ 42,159 $ 43,245
Repayment (as a percent) 100.00% 100.00% 100.00%
Year 2      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 6,005 $ 4,572 $ 4,729
Non-current financial assets (75) (252) (127)
Non-current financial debt and related financial instruments $ 5,930 $ 4,320 $ 4,602
Repayment (as a percent) 15.00% 10.00% 11.00%
Year 3      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 5,119 $ 5,812 $ 4,803
Non-current financial assets (2) (110) (383)
Non-current financial debt and related financial instruments $ 5,117 $ 5,702 $ 4,420
Repayment (as a percent) 13.00% 14.00% 10.00%
Year 4      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 3,810 $ 4,956 $ 5,716
Non-current financial assets (15) (4) (174)
Non-current financial debt and related financial instruments $ 3,795 $ 4,952 $ 5,542
Repayment (as a percent) 9.00% 12.00% 13.00%
Year 5      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 5,026 $ 3,609 $ 4,965
Non-current financial assets (67) (31)  
Non-current financial debt and related financial instruments $ 4,959 $ 3,578 $ 4,965
Repayment (as a percent) 12.00% 8.00% 11.00%
More than 5 years      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 21,380 $ 24,118 $ 24,251
Non-current financial assets (520) (511) (535)
Non-current financial debt and related financial instruments $ 20,860 $ 23,607 $ 23,716
Repayment (as a percent) 51.00% 56.00% 55.00%
Hedging instruments of non-current financial debt      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 1,082 $ 3,651 $ 2,891
Non-current financial assets (606) (845) (1,219)
Hedging instruments of non-current financial debt | Year 2      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 164 249 213
Non-current financial assets (68) (235) (127)
Hedging instruments of non-current financial debt | Year 3      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 222 327 218
Non-current financial assets   (104) (383)
Hedging instruments of non-current financial debt | Year 4      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 96 564 124
Non-current financial assets     (174)
Hedging instruments of non-current financial debt | Year 5      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 165 237 434
Non-current financial assets (67) (7)  
Hedging instruments of non-current financial debt | More than 5 years      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 435 2,274 1,902
Non-current financial assets $ (471) $ (499) $ (535)