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Consolidated statement of cash flows - additional details (Tables) | 12 Months Ended
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Dec. 31, 2020
Cash Flow Statement [Abstract] |
Disclosure of detailed information about cash flow statement line items |
($ millions) | 2020 |  | 2019 |  | 2018
Property, plant & equipment | 299 |  |  | 275 |  |  | 241 |
Right-of-use assets | 79 |  |  | 66 |  |  | — |
Intangible assets | 1,245 |  |  | 1,084 |  |  | 1,397 |
Financial assets | 5 |  |  | 31 |  |  | (16) |
Other non-current assets | (2) |  |  | — |  |  | — |
Total | 1,626 |  |  | 1,456 |  |  | 1,622 |
Disclosure of detailed information of change in net current assets and other operating cash flow items |
($ millions) | 2020 |  | 2019 |  | 2018
(Increase) in inventories | (159) |  |  | (108) |  |  | (150) |
Decrease/(increase) in trade receivables | 43 |  |  | (115) |  |  | 53 |
(Decrease)/increase in trade payables | (21) |  |  | 84 |  |  | 44 |
Net change in other current assets | 127 |  |  | (26) |  |  | 83 |
Net change in other current liabilities | (35) |  |  | 117 |  |  | 50 |
Total | (45) |  |  | (48) |  |  | 80 |
Disclosure of detailed information of cash flows arising from acquisitions |
($ millions) | 2020 |  | 2019 |  | 2018
Net assets recognized as a result of business combinations | — |  |  | (418) |  |  | (286) |
Payables contingent consideration | — |  |  | 135 |  |  | 102 |
Other payments | — |  |  | — |  |  | (55) |
Cash flows | — |  |  | (283) |  |  | (239) |
Disclosure of reconciliation of liabilities arising from financing activities |
|  | Financial Liabilities
($ millions) |  | Non-current financial debts |  | Current financial debts |  |  |  | Non-current lease liabilities |  | Current lease liabilities
January 1, 2020 |  | 3,218 |  |  | 261 |  |  |  |  | 280 |  |  | 61 |
Proceeds from non-current financial debts, net of issuance costs |  | 744 |  |  | — |  |  |  |  |  |  |
New leases |  |  |  |  |  |  |  | 96 |  |  | 11 |
Change in current financial debts |  | — |  |  | (139) |  |  |  |  |  |  |
Amortization of discounts on financial debts |  | 1 |  |  | — |  |  |  |  |  |  |
Payments of lease liabilities, net |  |  |  |  |  |  |  | — |  |  | (69) |
Interest payments for amounts included in lease liabilities classified as cash flows from operating activities |  |  |  |  |  |  |  | — |  |  | (12) |
Changes in fair values and other non-cash changes, net |  | 4 |  |  | (9) |  |  |  |  | (2) |  |  | 8 |
Currency translation effects |  | 37 |  |  | 1 |  |  |  |  | 10 |  |  | 2 |
Reclassification from non-current to current |  | (55) |  |  | 55 |  |  |  |  | (69) |  |  | 69 |
December 31, 2020 |  | 3,949 |  |  | 169 |  |  |  |  | 315 |  |  | 70 |
| Financial Assets |  | Financial Liabilities
($ millions) | Other financial receivables from former parent |  | Non-current financial debts |  | Current financial debts |  | Other financial liabilities to former parent |  |  |  | Non-current lease liabilities |  | Current lease liabilities
January 1, 2019 | (39) |  |  | — |  |  | 47 |  |  | 67 |  |  |  |  | 89 |  |  | — |
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 |  |  |  |  |  |  |  |  |
Impact of adoption of IFRS 16 Leases and new leases |  |  |  |  |  |  |  |  |  |  | 248 |  |  | 54 |
Payments of lease liabilities, net |  |  |  |  |  |  |  |  |  |  | — |  |  | (52) |
Interest payments for amounts included in lease liabilities classified as cash flows from operating activities |  |  |  |  |  |  |  |  |  |  | — |  |  | (5) |
Changes in fair values and other non-cash changes, net |  |  | 2 |  |  | 20 |  |  |  |  |  |  | (2) |  |  | 8 |
Change in other financial receivables from former parent | 39 |  |  |  |  |  |  |  |  |  |  |  |  |
Change in other financial liabilities to former parent |  |  |  |  |  |  | (67) |  |  |  |  |  |  |
Currency translation effects |  |  | 1 |  |  | (3) |  |  |  |  |  |  | 1 |  |  | — |
Reclassifications from non-current to current |  |  |  |  |  |  |  |  |  |  | (56) |  |  | 56 |
December 31, 2019 | — |  |  | 3,218 |  |  | 261 |  |  | — |  |  |  |  | 280 |  |  | 61 |

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