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Financial structure and financial costs - Loan repayment schedule (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 40,129 $ 41,340 $ 43,067
Non-current financial assets (680) (679) (908)
Non-current financial debt and related financial instruments $ 39,449 $ 40,661 $ 42,159
Repayment (as a percent) 100.00% 100.00% 100.00%
Year 2      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 5,442 $ 6,005 $ 4,572
Non-current financial assets (10) (75) (252)
Non-current financial debt and related financial instruments $ 5,432 $ 5,930 $ 4,320
Repayment (as a percent) 14.00% 15.00% 10.00%
Year 3      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 4,042 $ 5,119 $ 5,812
Non-current financial assets (76) (2) (110)
Non-current financial debt and related financial instruments $ 3,966 $ 5,117 $ 5,702
Repayment (as a percent) 10.00% 13.00% 14.00%
Year 4      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 5,262 $ 3,810 $ 4,956
Non-current financial assets (104) (15) (4)
Non-current financial debt and related financial instruments $ 5,158 $ 3,795 $ 4,952
Repayment (as a percent) 13.00% 9.00% 12.00%
Year 5      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 5,020 $ 5,026 $ 3,609
Non-current financial assets (37) (67) (31)
Non-current financial debt and related financial instruments $ 4,983 $ 4,959 $ 3,578
Repayment (as a percent) 13.00% 12.00% 8.00%
More than 5 years      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 20,363 $ 21,380 $ 24,118
Non-current financial assets (453) (520) (511)
Non-current financial debt and related financial instruments $ 19,910 $ 20,860 $ 23,607
Repayment (as a percent) 50.00% 51.00% 56.00%
Hedging instruments of non-current financial debt      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 1,880 $ 1,082 $ 3,651
Non-current financial assets (613) (606) (845)
Hedging instruments of non-current financial debt | Year 2      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 386 164 249
Non-current financial assets   (68) (235)
Hedging instruments of non-current financial debt | Year 3      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 251 222 327
Non-current financial assets (57)   (104)
Hedging instruments of non-current financial debt | Year 4      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 448 96 564
Non-current financial assets (104)    
Hedging instruments of non-current financial debt | Year 5      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 93 165 237
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 702 435 2,274
Non-current financial assets $ (452) $ (471) $ (499)