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Capital structure and financing - C.3.4. Guarantees and pledged assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of contingent liabilities [line items]    
Pledged deposits (related to back borrowings) $ 0 $ 1
Contingent liability for guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities 287 464
1 year | Contingent liability for guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities 59 29
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 227 134
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 $ 0 $ 300