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Segmentation of key figures - Consolidated income statements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of operating segments [line items] |  |  |  |  |
Net sales to third parties | $ 1,198 |  | $ 1,863 | $ 3,020 | $ 3,640
Other revenues | 16 |  | 40 | 35 | 87
Net sales and other revenues | 1,214 |  | 1,903 | 3,055 | 3,727
Segment contribution | (6) |  | 378 | 368 | 764
Amortization of intangible assets | (273) |  | (270) | (545) | (536)
Impairment charges on intangible assets | (41) |  | 0 | (57) | 0
General & administration (corporate) | (62) |  | (54) | (115) | (102)
Separation costs | (62) |  | (78) | (133) | (78)
Spin readiness costs |  |  |  | 0 | (72)
Transformation costs | (13) |  | (5) | (20) | (5)
Fair value adjustments of contingent consideration liabilities | (4) |  | 3 | 40 | 13
Other | (5) |  | (27) | (32) | (85)
Operating (loss) | (466) |  | (53) | (494) | (101)
Interest expense | (30) |  | (35) | (61) | (44)
Other financial income & expense | (6) |  | (8) | (16) | (16)
(Loss) before taxes | (502) |  | (96) | (571) | (161)
Surgical |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
Net sales to third parties | 602 |  | 1,051 | 1,586 | 2,051
Other revenues | 0 |  | 0 | 0 | 0
Net sales and other revenues | 602 |  | 1,051 | 1,586 | 2,051
Segment contribution | (28) |  | 235 | 180 | 463
Impairment charges on intangible assets |  | $ (16) |  |  |
Vision Care |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
Net sales to third parties | 596 |  | 812 | 1,434 | 1,589
Other revenues | 16 |  | 40 | 35 | 87
Net sales and other revenues | 612 |  | 852 | 1,469 | 1,676
Segment contribution | $ 22 |  | $ 143 | $ 188 | $ 301

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