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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financial Assets |  |  |
Change in other financial receivables from former parent | $ 0 | $ 39 | $ 26
Financial Liabilities |  |  |
Proceeds from non-current financial debts, net of issuance costs | 744 | 3,724 | 0
Repayment of non-current financial debts | 0 | (509) | 0
Proceeds from Bridge Facility, net of issuance costs | 0 | 1,495 | 0
Repayment of Bridge Facility | 0 | (1,500) | 0
Change in current financial debts | (139) | 202 | (6)
Change in other financial liabilities to former parent | 0 | (67) | 21
Lease liabilities |  |  |
Lease liabilities, beginning balance | 341 |  |
Payments of lease liabilities, net | (69) | (52) | 0
Lease liabilities, ending balance | 385 | 341 |
Non-current financial debt [member] |  |  |
Financial Liabilities |  |  |
Financial liabilities, beginning balance | 3,218 | 0 |
Proceeds from non-current financial debts, net of issuance costs | 744 | 3,724 |
Repayment of non-current financial debts |  | (509) |
Change in current financial debts | 0 |  |
Amortization of discounts on financial debts | 1 |  |
Changes in fair values and other non-cash changes, net | 4 | 2 |
Currency translation effects | 37 | 1 |
Reclassification from non-current to current | (55) |  |
Financial liabilities, ending balance | 3,949 | 3,218 | 0
Current financial debt [member] |  |  |
Financial Liabilities |  |  |
Financial liabilities, beginning balance | 261 | 47 |
Proceeds from non-current financial debts, net of issuance costs | 0 |  |
Proceeds from Bridge Facility, net of issuance costs |  | 1,495 |
Repayment of Bridge Facility |  | (1,500) |
Change in current financial debts | (139) | 202 |
Amortization of discounts on financial debts | 0 |  |
Changes in fair values and other non-cash changes, net | (9) | 20 |
Currency translation effects | 1 | (3) |
Reclassification from non-current to current | 55 |  |
Financial liabilities, ending balance | 169 | 261 | 47
Other financial liabilities to former parent [member] |  |  |
Financial Liabilities |  |  |
Financial liabilities, beginning balance | 0 | 67 |
Change in other financial liabilities to former parent |  | (67) |
Financial liabilities, ending balance |  | 0 | 67
Non-current Lease liabilities [member] |  |  |
Lease liabilities |  |  |
Lease liabilities, beginning balance | 280 | 89 |
New leases | 96 |  |
Payments of lease liabilities, net | 0 | 0 |
Interest payments for amounts included in lease liabilities classified as cash flows from operating activities | 0 | 0 |
Changes in fair values and other non-cash changes, net | (2) | (2) |
Currency translation effects | 10 | 1 |
Reclassification from non-current to current | (69) | (56) |
Lease liabilities, ending balance | 315 | 280 | 89
Non-current Lease liabilities [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |
Lease liabilities |  |  |
Lease liabilities, beginning balance |  | 248 |
Lease liabilities, ending balance |  |  | 248
Current Lease liabilities [member] |  |  |
Lease liabilities |  |  |
Lease liabilities, beginning balance | 61 | 0 |
New leases | 11 |  |
Payments of lease liabilities, net | (69) | (52) |
Interest payments for amounts included in lease liabilities classified as cash flows from operating activities | (12) | (5) |
Changes in fair values and other non-cash changes, net | 8 | 8 |
Currency translation effects | 2 | 0 |
Reclassification from non-current to current | 69 | 56 |
Lease liabilities, ending balance | 70 | 61 | 0
Current Lease liabilities [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |
Lease liabilities |  |  |
Lease liabilities, beginning balance |  | 54 |
Lease liabilities, ending balance |  |  | 54
Other financial receivables from former parent [member] |  |  |
Financial Assets |  |  |
Financial assets, ending balance |  | 0 | $ (39)
Change in other financial receivables from former parent |  | 39 |
Financial assets, beginning balance | $ 0 | $ (39) |

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