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Significant transactions (Details) - USD ($) |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 27, 2020 | Apr. 02, 2019 | Mar. 13, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 23, 2019 | Apr. 09, 2019 | Dec. 19, 2018 | Dec. 17, 2018
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings | $ 750,000,000 |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 2.60% |  |  |  |  |  |  |  |  |
Financial debts |  |  |  | $ 4,118,000,000 | $ 3,479,000,000 |  |  | $ 3,500,000,000 |  |
Cash paid for intercompany transactions related to spin-off |  | $ 3,100,000,000 |  |  |  |  |  |  |  |
Net assets |  |  |  |  |  |  |  | $ 20,000,000,000.0 |  |
Net identifiable assets acquired |  |  |  | 0 | 418,000,000 | $ 287,000,000 |  |  |  |
Acquired research & development |  |  |  | 0 | 505,000,000 | 0 |  |  |  |
Currently marketed products |  |  |  | 0 | 0 | 346,000,000 |  |  |  |
Goodwill |  |  |  | 0 | 6,000,000 | 4,000,000 |  |  |  |
Consideration paid (received) |  |  |  | 0 | 283,000,000 | 239,000,000 |  |  |  |
Cash and cash equivalents |  |  |  | $ 0 | $ 6,000,000 | $ 5,000,000 |  |  |  |
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 |  |  | $ 424,000,000 |  |  |  |  |  |  |
Cash transferred |  |  | 289,000,000 |  |  |  |  |  |  |
Contingent liabilities recognised as of acquisition date |  |  | 135,000,000 |  |  |  |  |  |  |
Net identifiable assets acquired |  |  | 418,000,000 |  |  |  |  |  |  |
Acquired research & development |  |  | 505,000,000 |  |  |  |  |  |  |
Net deferred tax liabilities recognised |  |  | 93,000,000 |  |  |  |  |  |  |
Other net assets recognised as of acquisition date |  |  | 6,000,000 |  |  |  |  |  |  |
Goodwill |  |  | 6,000,000 |  |  |  |  |  |  |
Consideration paid (received) |  |  | $ 283,000,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 146,000,000 |
Cash transferred |  |  |  |  |  |  |  |  | 110,000,000 |
Contingent liabilities recognised as of acquisition date |  |  |  |  |  |  |  |  | 36,000,000 |
Net identifiable assets acquired |  |  |  |  |  |  |  |  | 144,000,000 |
Currently marketed products |  |  |  |  |  |  |  |  | 172,000,000 |
Net deferred tax liabilities recognised |  |  |  |  |  |  |  |  | 29,000,000 |
Other net assets recognised as of acquisition date |  |  |  |  |  |  |  |  | 1,000,000 |
Goodwill |  |  |  |  |  |  |  |  | $ 2,000,000 |
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 |  |  |  |  |  |  |  |  |  | $ 145,000,000
Cash transferred |  |  |  |  |  |  |  |  |  | 79,000,000
Contingent liabilities recognised as of acquisition date |  |  |  |  |  |  |  |  |  | 66,000,000
Net identifiable assets acquired |  |  |  |  |  |  |  |  |  | 143,000,000
Currently marketed products |  |  |  |  |  |  |  |  |  | 174,000,000
Net deferred tax liabilities recognised |  |  |  |  |  |  |  |  |  | 37,000,000
Other net assets recognised as of acquisition date |  |  |  |  |  |  |  |  |  | 1,000,000
Goodwill |  |  |  |  |  |  |  |  |  | 2,000,000
Cash and cash equivalents |  |  |  |  |  |  |  |  |  | $ 5,000,000
Senior notes due 2026 [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  | 2.75% |  |  |
Notional amount |  |  |  |  |  |  | $ 500,000,000 |  |  |
Senior notes due 2029 [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  | 3.00% |  |  |
Notional amount |  |  |  |  |  |  | $ 1,000,000,000 |  |  |
Senior notes due 2049 [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  | 3.80% |  |  |
Notional amount |  |  |  |  |  |  | $ 500,000,000 |  |  |
Bridge and other term loans [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  | $ 3,200,000,000 |  |  |  |  |  |  |  |
Bridge and Term Loans |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 2,000,000,000.0 |  |  |

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