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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

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