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Finance debt - Current finance debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Current finance debt [abstract]    
Collateral liabilities $ 1,704 $ 585
Non-current finance debt due within one year 1,974 2,004
Other including US Commercial paper programme and bank overdraft 913 350
Total current finance debt [1] $ 4,591 $ 2,939
Weighted average interest rate (%) 2.40% 2.18%
Commerical paper program issuance $ 903 $ 340
[1]
* Lease liabilities are separated from the line item Finance debt and 2019 is reclassified.