| Line Item | Dec 31, 2025 | Dec 31, 2024 | Dec 31, 2023 |
|---|---|---|---|
| Profit (loss) [abstract] | |||
| Transaction and service revenue | |||
| Gain on sale of consumer receivables | |||
| Interest income | |||
| Total revenue | |||
| Processing and servicing costs | |||
| Provision for credit losses | |||
| Funding costs | |||
| Technology and product development | |||
| Sales and marketing | |||
| Customer service and operations | |||
| General and administrative | |||
| Depreciation, amortization and impairments | |||
| Operating expenses | |||
| Operating loss | |||
| Other income (expense) | |||
| Profit (loss) before taxes | |||
| Tax (expense) benefit | |||
| Net profit (loss) | |||
| Whereof attributable to: | |||
| Shareholders of Klarna Group plc | |||
| Non-controlling interests | |||
| Other equity holders | |||
| Net profit (loss) | |||
| Net profit (loss) per share attributable to shareholders of Klarna Group plc | |||
| Basic earnings (loss) per share (in USD per share) | |||
| Diluted earnings (loss) per share (in USD per share) |