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Capital structure and financing - C.3.5.Guarantees and pledged assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of contingent liabilities [line items]    
Borrowings secured by assets, deposits or guarantees $ 626 $ 671
Pledged deposits (related to bank borrowings) 2 1
Contingent liability for guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities 626 671
Maximum exposure to contingent liabilities 626 671
1 year | Contingent liability for guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities 133 159
Maximum exposure to contingent liabilities 133 159
Later than one year and not later than three years | Contingent liability for guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities 281 368
Maximum exposure to contingent liabilities 281 368
Later than three years and not later than five years | Contingent liability for guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities 212 144
Maximum exposure to contingent liabilities $ 212 $ 144