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Consolidated statement of cash flows - additional details (Tables) | 12 Months Ended
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Dec. 31, 2019
Cash Flow Statement [Abstract] |
Disclosure of detailed information about cash flow statement line items |
($ millions) | 2019 |  |  | 2018 |  |  | 2017 |
Property, plant & equipment | 275 |  |  | 241 |  |  | 215 |
Right-of-use assets | 66 |  |  | — |  |  | — |
Intangible assets | 1,084 |  |  | 1,397 |  |  | 1,090 |
Financial assets | 31 |  |  | (16 | ) |  | 29 |
Total | 1,456 |  |  | 1,622 |  |  | 1,334 |
Disclosure of detailed information of change in net current assets and other operating cash flow items |
($ millions) | 2019 |  |  | 2018 |  |  | 2017 |
(Increase) in inventories | (108 | ) |  | (150 | ) |  | (87 | )
(Increase)/decrease in trade receivables | (115 | ) |  | 53 |  |  | (54 | )
Increase in trade payables | 84 |  |  | 44 |  |  | 48 |
Net change in other current assets | (26 | ) |  | 83 |  |  | 87 |
Net change in other current liabilities | 117 |  |  | 50 |  |  | 42 |
Total | (48 | ) |  | 80 |  |  | 36 |
Disclosure of detailed information of cash flows arising from acquisitions |
($ millions) |  | 2019 |  |  | 2018 |  |  | 2017 |
Net assets recognized as a result of business combinations |  | (418 | ) |  | (286 | ) |  | (124 | )
Payables contingent consideration |  | 135 |  |  | 102 |  |  | 54 |
Other payments |  | — |  |  | (55 | ) |  |
Cash flows |  | (283 | ) |  | (239 | ) |  | (70 | )
Disclosure of reconciliation of liabilities arising from financing activities |
| Financial Assets |  | Financial Liabilities
($ millions) | Other financial receivables from former parent |  |  | Non-current financial debts |  |  | Current financial debts |  |  | Other financial liabilities to former parent |  |  | Total |
January 1, 2019 | (39 | ) |  | — |  |  | 47 |  |  | 67 |  |  | 114 |
Proceeds from non-current financial debts, net of issuance costs |  |  |  | 3,724 |  |  |  |  |  |  |  |  | 3,724 |
Repayment of non-current financial debts |  |  |  | (509 | ) |  |  |  |  |  |  | (509 | )
Proceeds from Bridge Facility, net of issuance costs |  |  |  |  | 1,495 |  |  |  |  | 1,495 |
Repayment of Bridge Facility |  |  |  |  | (1,500 | ) |  |  |  | (1,500 | )
Change in current financial debts |  |  |  |  |  |  | 202 |  |  |  |  |  | 202 |
Non-cash changes in derivatives and other fair value adjustments |  |  |  | 2 |  |  | 20 |  |  |  |  |  | 22 |
Change in other financial receivables from former parent | 39 |  |  |  |  |  |  |  |  |  |  |  |  |
Change in other financial liabilities to former parent |  |  |  |  |  |  |  |  |  | (67 | ) |  | (67 | )
Currency translation effects |  |  |  | 1 |  |  | (3 | ) |  |  |  |  | (2 | )
December 31, 2019 | — |  |  | 3,218 |  |  | 261 |  |  | — |  |  | 3,479 |
| Financial Assets |  | Financial Liabilities
($ millions) | Other financial receivables from former parent |  |  | Non-current financial debts |  |  | Current financial debts |  |  | Other financial liabilities to former parent |  |  | Total |
January 1, 2018 | (65 | ) |  | 84 |  |  | 65 |  |  | 46 |  |  | 195 |
Change in current financial debts |  |  |  |  | (6 | ) |  |  |  | (6 | )
Change in other financial receivables from former parent | 26 |  |  |  |  |  |  |  |  |
Change in other financial liabilities to former parent |  |  |  |  |  |  | 21 |  |  | 21 |
Non-cash change in finance lease obligation |  |  | 5 |  |  |  |  |  |  | 5 |
Currency translation effects |  |  |  |  | (12 | ) |  |  |  | (12 | )
Reclassification from non-current financial debts to lease liabilities |  |  | (89 | ) |  |  |  |  |  | (89 | )
December 31, 2018 | (39 | ) |  | — |  |  | 47 |  |  | 67 |  |  | 114 |

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