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Fair value measurement of financial assets and liabilities - Summary of fair value measurement of assets and liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | $ 822 | $ 36 |
Total financial liabilities | 13 | 61 |
Recurring fair value measurement | Derivatives |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial liabilities | 13 | 61 |
Recurring fair value measurement | Convertible notes |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial liabilities | 0 | 0 |
Level 1 | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 7 | 9 |
Total financial liabilities | 0 | 0 |
Level 1 | Recurring fair value measurement | Derivatives |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial liabilities | 0 | 0 |
Level 1 | Recurring fair value measurement | Convertible notes |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial liabilities | 0 | 0 |
Level 2 | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 21 | 10 |
Total financial liabilities | 13 | 61 |
Level 2 | Recurring fair value measurement | Derivatives |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial liabilities | 13 | 61 |
Level 2 | Recurring fair value measurement | Convertible notes |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial liabilities | 0 | 0 |
Level 3 | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 794 | 17 |
Total financial liabilities | 0 | 0 |
Level 3 | Recurring fair value measurement | Derivatives |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial liabilities | 0 | 0 |
Level 3 | Recurring fair value measurement | Convertible notes |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial liabilities | 0 | 0 |
Consumer receivables at fair value through P&L | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 400 | 2 |
Consumer receivables at fair value through P&L | Level 1 | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 0 | 0 |
Consumer receivables at fair value through P&L | Level 2 | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 0 | 0 |
Consumer receivables at fair value through P&L | Level 3 |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 400 | 2 | $ 0
Consumer receivables at fair value through P&L | Level 3 | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 400 | 2 |
Consumer receivables at fair value through OCI | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 386 | 0 |
Consumer receivables at fair value through OCI | Level 1 | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 0 | 0 |
Consumer receivables at fair value through OCI | Level 2 | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 0 | 0 |
Consumer receivables at fair value through OCI | Level 3 | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 386 | 0 |
Derivatives | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 21 | 10 |
Derivatives | Level 1 | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 0 | 0 |
Derivatives | Level 2 | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 21 | 10 |
Derivatives | Level 3 | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 0 | 0 |
Equity investments | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 15 | 24 |
Equity investments | Level 1 | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 7 | 9 |
Equity investments | Level 2 | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 0 | 0 |
Equity investments | Level 3 |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | 8 | 15 | $ 26
Equity investments | Level 3 | Recurring fair value measurement |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Total financial assets | $ 8 | $ 15 |

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Classes of financial instruments [domain]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_25&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35H&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35M&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35N&doctype=Standard -URIDate 2025-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35I&doctype=Standard -URIDate 2025-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_66&doctype=Standard -URIDate 2025-03-27 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 71 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_71&doctype=Standard -URIDate 2025-03-27 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 70 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_70&doctype=Standard -URIDate 2025-03-27 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 70 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_70&doctype=Standard -URIDate 2025-03-27 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_66&doctype=Standard -URIDate 2025-03-27 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 71 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_71&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Classes of financial instruments [domain]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_25&doctype=Standard -URIDate 2025-03-27 + Details
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