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Finance debt - Non-current debt maturity profile (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Non-current finance debt maturity profile [abstract]    
Total repayment of non-current finance debt [1] $ 29,118 $ 21,754
Weighted average [member]    
Non-current finance debt maturity profile [abstract]    
Weighted average maturity (years) 10 9
Weighted average [member] | Interest Rate Non Current Debt [Member]    
Non-current finance debt maturity profile [abstract]    
Weighted average annual interest rate (%) 3.38% 3.64%
Year 2 and 3 [member]    
Non-current finance debt maturity profile [abstract]    
Total repayment of non-current finance debt $ 3,705 $ 2,846
Year 4 and 5 [member]    
Non-current finance debt maturity profile [abstract]    
Total repayment of non-current finance debt 4,927 5,004
After 5 years [member]    
Non-current finance debt maturity profile [abstract]    
Total repayment of non-current finance debt $ 20,485 $ 13,904
[1]
* Lease liabilities are separated from the line item Finance debt and 2019 is reclassified.