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Finance debt - Non-current and current finance debt maturity profile (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 13, 2019
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Non-current finance debt maturity profile [abstract]        
Total repayment of non-current finance debt   $ 24,945 $ 23,264 $ 26,423
Weighted average maturity (years) November 2049      
Weighted average annual interest rate (%) 3.25%      
Current finance debt [abstract]        
Collateral liabilities   585 213  
Non-current finance debt due within one year   3,152 1,380  
Other including US Commercial paper programme and bank overdraft   350 870  
Total current finance debt   4,087 2,463 $ 3,532
Commerical paper program issuance   $ 340 $ 842  
Weighted average [member]        
Non-current finance debt maturity profile [abstract]        
Weighted average maturity (years)   9 years 9 years  
Weighted average [member] | Interest Rate Non Current Debt [Member]        
Non-current finance debt maturity profile [abstract]        
Weighted average annual interest rate (%)   3.53% 3.67%  
Weighted average [member] | Ineterest Rate Current Debt [Member]        
Non-current finance debt maturity profile [abstract]        
Weighted average annual interest rate (%)   2.39% 1.62%  
Year 2 and 3 [member]        
Non-current finance debt maturity profile [abstract]        
Total repayment of non-current finance debt   $ 4,156 $ 4,003  
Year 4 and 5 [member]        
Non-current finance debt maturity profile [abstract]        
Total repayment of non-current finance debt   5,680 3,736  
After 5 years [member]        
Non-current finance debt maturity profile [abstract]        
Total repayment of non-current finance debt   $ 15,109 $ 15,525