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Significant transactions (Details) - USD ($) $ in Millions |  |  |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 02, 2019 | Mar. 13, 2019 | Dec. 17, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Apr. 09, 2019 | Dec. 31, 2018 | Dec. 19, 2018
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proceeds from borrowings | $ 3,200 |  |  |  |  |  |  |
Financial debts | 3,500 |  |  | $ 3,522 |  |  | $ 47 |
Cash paid for intercompany transactions related to spin-off | $ 3,100 |  |  |  |  |  |  |
Net assets |  |  |  |  |  | $ 20,000 |  |
Consideration paid (received) |  |  |  | $ 283 | $ 0 |  |  |
PowerVision, Inc. [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  | 100.00% |  |  |  |  |  |
Consideration transferred, acquisition-date fair value |  | $ 424 |  |  |  |  |  |
Cash transferred |  | 289 |  |  |  |  |  |
Contingent liabilities recognised as of acquisition date |  | 135 |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) |  | 418 |  |  |  |  |  |
Identifiable intangible assets recognised as of acquisition date |  | 505 |  |  |  |  |  |
Deferred tax liabilities recognised as of acquisition date |  | 93 |  |  |  |  |  |
Consideration paid (received) |  | 283 |  |  |  |  |  |
Other net assets recognised as of acquisition date |  | 6 |  |  |  |  |  |
Goodwill recognised as of acquisition date |  | $ 6 |  |  |  |  |  |
TrueVision Systems, Inc. [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  |  | 100.00%
Consideration transferred, acquisition-date fair value |  |  |  |  |  |  |  | $ 146
Cash transferred |  |  |  |  |  |  |  | 110
Contingent liabilities recognised as of acquisition date |  |  |  |  |  |  |  | 36
Identifiable assets acquired (liabilities assumed) |  |  |  |  |  |  |  | 144
Identifiable intangible assets recognised as of acquisition date |  |  |  |  |  |  |  | 172
Deferred tax liabilities recognised as of acquisition date |  |  |  |  |  |  |  | 29
Other net assets recognised as of acquisition date |  |  |  |  |  |  |  | 1
Goodwill recognised as of acquisition date |  |  |  |  |  |  |  | $ 2
Tear Film Innovations, Inc. [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  | 100.00% |  |  |  |  |
Consideration transferred, acquisition-date fair value |  |  | $ 145 |  |  |  |  |
Cash transferred |  |  | 79 |  |  |  |  |
Contingent liabilities recognised as of acquisition date |  |  | 66 |  |  |  |  |
Identifiable assets acquired (liabilities assumed) |  |  | 143 |  |  |  |  |
Identifiable intangible assets recognised as of acquisition date |  |  | 174 |  |  |  |  |
Deferred tax liabilities recognised as of acquisition date |  |  | 37 |  |  |  |  |
Consideration paid (received) |  |  | 5 |  |  |  |  |
Other net assets recognised as of acquisition date |  |  | 1 |  |  |  |  |
Goodwill recognised as of acquisition date |  |  | $ 2 |  |  |  |  |

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