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Significant transactions (Details) - USD ($) |  |  |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 27, 2020 | Apr. 02, 2019 | Mar. 13, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Sep. 23, 2019 | Apr. 09, 2019
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proceeds from borrowings |  | $ 3,200,000,000 |  |  |  |  |  |
Financial debts |  | 3,500,000,000 |  | $ 4,144,000,000 |  | $ 3,479,000,000 |  |
Cash paid for intercompany transactions related to spin-off |  | $ 3,100,000,000 |  |  |  |  |  |
Net assets |  |  |  |  |  |  |  | $ 20,000,000,000.0
Consideration paid (received) |  |  |  | $ 0 | $ 283,000,000 |  |  |
PowerVision, Inc. |  |  |  |  |  |  |  |
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 |  |  |  |  |
Identifiable assets acquired (liabilities assumed) |  |  | 418,000,000 |  |  |  |  |
Identifiable intangible assets recognised as of acquisition date |  |  | 505,000,000 |  |  |  |  |
Deferred tax liabilities recognised as of acquisition date |  |  | 93,000,000 |  |  |  |  |
Other net assets recognised as of acquisition date |  |  | 6,000,000 |  |  |  |  |
Goodwill recognised as of acquisition date |  |  | 6,000,000 |  |  |  |  |
Consideration paid (received) |  |  | $ 283,000,000 |  |  |  |  |
Series 2030 notes |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proceeds from borrowings | $ 750,000,000 |  |  |  |  |  |  |
Borrowings, interest rate | 2.60% |  |  |  |  |  |  |
Notional amount | $ 750,000,000 |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 2,000,000,000 |
Series 2026 notes |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  | 2.75% |
Notional amount |  |  |  |  |  |  | $ 500,000,000 |
Series 2029 notes |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  | 3.00% |
Notional amount |  |  |  |  |  |  | $ 1,000,000,000 |
Series 2049 notes |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  | 3.80% |
Notional amount |  |  |  |  |  |  | $ 500,000,000 |

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