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Capital structure and financing - C.3.5. Guarantees and pledged assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of contingent liabilities [line items]    
Pledged deposits (related to back borrowings) $ 1 $ 2
Contingent liability for guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities 464 626
Maximum exposure to contingent liabilities 464 626
1 year | Contingent liability for guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities 29 133
Maximum exposure to contingent liabilities 29 133
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 134 281
Maximum exposure to contingent liabilities 134 281
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 300 212
Maximum exposure to contingent liabilities $ 300 $ 212