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Accounting principles - Revenue recognition (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Sales and marketing expense | $ 414 | $ 328 | $ 381
Revenue, reduction of interest income, merchant fees | $ 12 | 10 | 13
Minimum |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Useful life of contract | 3 years |  |
Maximum |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Useful life of contract | 5 years |  |
Distribution partner referral arrangements |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Sales and marketing expense | $ 109 | $ 81 | $ 59

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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_85&doctype=Standard -URIDate 2025-03-27 + Details
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