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Financial structure and financial costs - Loan repayment schedule (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 47,773 $ 40,129 $ 41,340
Non-current financial assets (912) (680) (679)
Non-current net financial debt and related financial instruments $ 46,861 $ 39,449 $ 40,661
Repayment (as a percent) 100.00% 100.00% 100.00%
Year 2      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 5,716 $ 5,442 $ 6,005
Non-current financial assets (101) (10) (75)
Non-current net financial debt and related financial instruments $ 5,615 $ 5,432 $ 5,930
Repayment (as a percent) 12.00% 14.00% 15.00%
Year 3      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 6,226 $ 4,042 $ 5,119
Non-current financial assets (148) (76) (2)
Non-current net financial debt and related financial instruments $ 6,078 $ 3,966 $ 5,117
Repayment (as a percent) 13.00% 10.00% 13.00%
Year 4      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 5,230 $ 5,262 $ 3,810
Non-current financial assets (67) (104) (15)
Non-current net financial debt and related financial instruments $ 5,163 $ 5,158 $ 3,795
Repayment (as a percent) 11.00% 13.00% 9.00%
Year 5      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 5,885 $ 5,020 $ 5,026
Non-current financial assets (87) (37) (67)
Non-current net financial debt and related financial instruments $ 5,798 $ 4,983 $ 4,959
Repayment (as a percent) 12.00% 13.00% 12.00%
More than 5 years      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 24,716 $ 20,363 $ 21,380
Non-current financial assets (509) (453) (520)
Non-current net financial debt and related financial instruments $ 24,207 $ 19,910 $ 20,860
Repayment (as a percent) 52.00% 50.00% 51.00%
Hedging instruments of non-current financial debt      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 1,694 $ 1,880 $ 1,082
Non-current financial assets (512) (613) (606)
Hedging instruments of non-current financial debt | Year 2      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 204 386 164
Non-current financial assets (9)   (68)
Hedging instruments of non-current financial debt | Year 3      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 433 251 222
Non-current financial assets (121) (57)  
Hedging instruments of non-current financial debt | Year 4      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 106 448 96
Non-current financial assets (18) (104)  
Hedging instruments of non-current financial debt | Year 5      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 139 93 165
Non-current financial assets (83)   (67)
Hedging instruments of non-current financial debt | More than 5 years      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 812 702 435
Non-current financial assets $ (281) $ (452) $ (471)