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Financial structure and financial costs - Loan repayment schedule (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 60,203 $ 47,773 $ 40,129
Non-current financial assets (4,781) (912) (680)
NON-CURRENT NET FINANCIAL DEBT AND RELATED FINANCIAL INSTRUMENTS $ 55,422 $ 46,861 $ 39,449
Repayment (as a percent) 100.00% 100.00% 100.00%
Year 2      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 9,932 $ 5,716 $ 5,442
Non-current financial assets (142) (101) (10)
NON-CURRENT NET FINANCIAL DEBT AND RELATED FINANCIAL INSTRUMENTS $ 9,790 $ 5,615 $ 5,432
Repayment (as a percent) 18.00% 12.00% 14.00%
Year 3      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 5,988 $ 6,226 $ 4,042
Non-current financial assets (268) (148) (76)
NON-CURRENT NET FINANCIAL DEBT AND RELATED FINANCIAL INSTRUMENTS $ 5,720 $ 6,078 $ 3,966
Repayment (as a percent) 10.00% 13.00% 10.00%
Year 4      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 6,340 $ 5,230 $ 5,262
Non-current financial assets (395) (67) (104)
NON-CURRENT NET FINANCIAL DEBT AND RELATED FINANCIAL INSTRUMENTS $ 5,945 $ 5,163 $ 5,158
Repayment (as a percent) 11.00% 11.00% 13.00%
Year 5      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 4,535 $ 5,885 $ 5,020
Non-current financial assets (260) (87) (37)
NON-CURRENT NET FINANCIAL DEBT AND RELATED FINANCIAL INSTRUMENTS $ 4,275 $ 5,798 $ 4,983
Repayment (as a percent) 8.00% 12.00% 13.00%
More than 5 years      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 33,408 $ 24,716 $ 20,363
Non-current financial assets (3,716) (509) (453)
NON-CURRENT NET FINANCIAL DEBT AND RELATED FINANCIAL INSTRUMENTS $ 29,692 $ 24,207 $ 19,910
Repayment (as a percent) 53.00% 52.00% 50.00%
Hedging instruments of non-current financial debt      
Loan repayment schedule (excluding current portion)      
Non-current financial debt $ 1,615 $ 1,694 $ 1,880
Non-current financial assets (3,221) (512) (613)
Hedging instruments of non-current financial debt | Year 2      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 142 204 386
Non-current financial assets (58) (9)  
Hedging instruments of non-current financial debt | Year 3      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 59 433 251
Non-current financial assets (218) (121) (57)
Hedging instruments of non-current financial debt | Year 4      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 115 106 448
Non-current financial assets (277) (18) (104)
Hedging instruments of non-current financial debt | Year 5      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 150 139 93
Non-current financial assets (212) (83)  
Hedging instruments of non-current financial debt | More than 5 years      
Loan repayment schedule (excluding current portion)      
Non-current financial debt 1,149 812 702
Non-current financial assets $ (2,456) $ (281) $ (452)