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Consolidated statement of cash flows - additional details - Reconciliation of assets and liabilities arising from financing activities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Proceeds from non-current financial debts, net of issuance costs | $ 3,724 | $ 0 | $ 0
Repayment of non-current financial debts | (509) | 0 | 0
Proceeds from Bridge Facility, net of issuance costs | 1,495 | 0 | 0
Repayment of Bridge Facility | (1,500) | 0 | 0
Change in current financial debts | 202 | (6) | (111)
Change in other financial receivables from former parent | 39 | 26 | (24)
Change in other financial liabilities to former parent | (67) | 21 | 20
Non-current financial debt [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Financial liabilities, beginning balance | 0 | 84 |
Proceeds from non-current financial debts, net of issuance costs | 3,724 |  |
Repayment of non-current financial debts | (509) |  |
Non-cash changes in derivatives and other fair value adjustments | 2 |  |
Non-cash change in finance lease obligation |  | 5 |
Currency translation effects | 1 |  |
Reclassification from non-current financial debts to lease liabilities |  | (89) |
Financial liabilities, ending balance | 3,218 | 0 | 84
Current financial debt [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Financial liabilities, beginning balance | 47 | 65 |
Proceeds from Bridge Facility, net of issuance costs | 1,495 |  |
Repayment of Bridge Facility | (1,500) |  |
Change in current financial debts | 202 | (6) |
Non-cash changes in derivatives and other fair value adjustments | 20 |  |
Currency translation effects | (3) | (12) |
Financial liabilities, ending balance | 261 | 47 | 65
Other financial liabilities to former parent [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Financial liabilities, beginning balance | 67 | 46 |
Change in other financial liabilities to former parent | (67) | 21 |
Financial liabilities, ending balance | 0 | 67 | 46
Total liabilities arising from financing activities [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Total, beginning balance | 114 | 195 |
Proceeds from non-current financial debts, net of issuance costs | 3,724 |  |
Repayment of non-current financial debts | (509) |  |
Proceeds from Bridge Facility, net of issuance costs | 1,495 |  |
Repayment of Bridge Facility | (1,500) |  |
Change in current financial debts | 202 | (6) |
Non-cash changes in derivatives and other fair value adjustments | 22 |  |
Change in other financial receivables from former parent |  |  |
Change in other financial liabilities to former parent | (67) | 21 |
Non-cash change in finance lease obligation |  | 5 |
Currency translation effects | (2) | (12) |
Reclassification from non-current financial debts to lease liabilities |  | (89) |
Total, ending balance | 3,479 | 114 | 195
Other financial receivables from former parent [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Financial assets, beginning balance | (39) | (65) |
Change in other financial receivables from former parent | 39 | 26 |
Financial assets, ending balance | $ 0 | $ (39) | $ (65)

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