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Finance debt - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]    
Current finance debt $ 10,487 $ 9,329 [1]
Carrying amount | Within one year | Long-Term Borrowings, Excluding Finance Lease Liabilities    
Disclosure of detailed information about borrowings [line items]    
Current finance debt 8,166 7,175
Carrying amount | Within one year | Commercial Papers    
Disclosure of detailed information about borrowings [line items]    
Current finance debt $ 2,279 $ 2,040
Fixed rate debt | Weighted average    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 3.00% 4.00%
Fixed rate debt | Weighted average | Other currencies    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 6.00% 5.00%
Weighted average time for which rate is fixed Years 10 years 5 years
Fixed rate debt | Weighted average | Previously stated [member] | Other currencies    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate   7.00%
Weighted average time for which rate is fixed Years   18 years
Adjustment on adoption of IFRS 16 [Member] | Obligations Under Finance Leases [Member]    
Disclosure of detailed information about borrowings [line items]    
Financial liabilities   $ 667
[1] a Finance debt on the comparative balance sheet has been re-presented to align with the current period. See Note 1 for further information.