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Share-based payments - Schedule of number and weighted average exercise prices of other equity instruments (Details) | 12 Months Ended
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Dec. 31, 2025 shares $ / shares | Dec. 31, 2024 shares $ / shares | Dec. 31, 2023 shares $ / shares
Ordinary shares |  |  |
Reconciliation of Share Options [Roll Forward] |  |  |
Granted during the year (in shares) | 299,572 |  |
Number of shares entitled (in shares) | 1 |  |
Ordinary shares | Chief Executive Officer |  |  |
Reconciliation of Share Options [Roll Forward] |  |  |
Amended during the year (in shares) | (1,470,618) |  |
Share options, class C |  |  |
Reconciliation of Share Options [Roll Forward] |  |  |
Number of shares entitled (in shares) | 2 |  |
Share options, class C | Chief Executive Officer |  |  |
Reconciliation of Share Options [Roll Forward] |  |  |
Granted during the year (in shares) | 17,505,672 |  |
Amended during the year (in shares) | (2,941,236) |  |
Weighted average fair value, granted during period (in us dollar per share) | $ / shares | $ 91.8 |  |
Weighted average fair value, amended during period (in us dollar per share) | $ / shares | $ 91.8 |  |
Restricted share units |  |  |
Reconciliation of Other Equity Instruments [Roll Forward] |  |  |
Number of other equity instruments outstanding at beginning of period (in shares) | 0 | 0 | 0
Granted during the year (in shares) | 1,026,951 | 0 | 0
Exercised during the year (in shares) | 0 | 0 | 0
Amended during the year (in shares) | 0 |  |
Forfeited during the year (in shares) | (28,044) | 0 | 0
Number of other equity instruments outstanding at end of period (in shares) | 998,907 | 0 | 0
Weighted average fair value, outstanding at beginning of period (in us dollar per share) | $ / shares | $ 0 | $ 0 | $ 0
Weighted average fair value, granted during period (in us dollar per share) | $ / shares | 34.2 | 0 | 0
Weighted average fair value, exercised during period (in us dollar per share) | $ / shares | 0 | 0 | 0
Weighted average fair value, amended during period (in us dollar per share) | $ / shares | 0 |  |
Weighted average fair value, forfeited during period (in us dollar per share) | $ / shares | 34.0 | 0 | 0
Weighted average fair value, outstanding at end of period (in us dollar per share) | $ / shares | $ 34.2 | $ 0 | $ 0
Number of other equity instruments outstanding at end of period, equivalent of Klarna Group plc Shares (in shares) | 3,649,304 |  |
Weighted average fair value, outstanding at end of period, equivalent of Klarna Group plc Shares (in us dollar per share) | $ / shares | $ 20.4 |  |
Restricted share units | Ordinary shares |  |  |
Reconciliation of Share Options [Roll Forward] |  |  |
Granted during the year (in shares) | 2,563,600 |  |
Restricted share units | Klarna Group PLC subsidiary |  |  |
Reconciliation of Other Equity Instruments [Roll Forward] |  |  |
Number of other equity instruments outstanding at beginning of period (in shares) | 26,411,646 | 10,208,104 | 7,988,295
Granted during the year (in shares) | 123,335 | 22,659,832 | 7,081,803
Released during the year (in shares) | (8,225,629) | (3,164,977) | (2,411,162)
Exercised during the year (in shares) | 0 | 0 | 0
Repurchased during the year (in shares) | 0 |  |
Amended during the year (in shares) | 0 |  |
Forfeited during the year (in shares) | (3,712,137) | (3,291,313) | (2,450,832)
Number of other equity instruments outstanding at end of period (in shares) | 14,597,215 | 26,411,646 | 10,208,104
Weighted average fair value, outstanding at beginning of period (in us dollar per share) | $ / shares | $ 4.5 | $ 4.9 | $ 6.0
Weighted average fair value, granted during period (in us dollar per share) | $ / shares | 10.1 | 4.4 | 4.2
Weighted average fair value, released during period (in us dollar per share) | $ / shares | 5.3 | 5.3 | 6.3
Weighted average fair value, exercised during period (in us dollar per share) | $ / shares | 0 | 0 | 0
Weighted average fair value, repurchased during period (in us dollar per share) | $ / shares | 0 |  |
Weighted average fair value, amended during period (in us dollar per share) | $ / shares | 0 |  |
Weighted average fair value, forfeited during period (in us dollar per share) | $ / shares | 5.0 | 4.7 | 5.1
Weighted average fair value, outstanding at end of period (in us dollar per share) | $ / shares | $ 5.1 | $ 4.5 | $ 4.9
Share warrants and share options |  |  |
Reconciliation of Share Options [Roll Forward] |  |  |
Number of options outstanding at beginning of period (in shares) | 6,100,140 | 0 | 0
Granted during the year (in shares) | 24,909,751 | 6,100,140 | 0
Exercised during the year (in shares) | (2,400,000) | 0 | 0
Amended during the year (in shares) | (1,477,164) |  |
Forfeited during the year (in shares) | 0 | 0 | 0
Number of options outstanding at end of period (in shares) | 27,132,727 | 6,100,140 | 0
Weighted average exercise price outstanding, beginning balance (in us dollar per share) | $ / shares | $ 46.0 | $ 0 | $ 0
Weighted average fair value, granted during period (in us dollar per share) | $ / shares | 57.0 | 46.0 | 0
Weighted average fair value, exercised during period (in us dollar per share) | $ / shares | 0 | 0 | 0
Weighted average fair value, amended during period (in us dollar per share) | $ / shares | 38.2 |  |
Weighted average fair value, forfeited during period (in us dollar per share) | $ / shares | 0 | 0 | 0
Weighted average exercise price outstanding, ending balance (in us dollar per share) | $ / shares | $ 60.6 | $ 46.0 | $ 0
Share warrants and share options | Ordinary shares |  |  |
Reconciliation of Share Options [Roll Forward] |  |  |
Number of shares received per two Class C award vested (in shares) | 1 |  |
Share warrants and share options | Share options, class C |  |  |
Reconciliation of Share Options [Roll Forward] |  |  |
Number of shares received per two Class C award vested (in shares) | 2 |  |
Share options, class C |  |  |
Reconciliation of Share Options [Roll Forward] |  |  |
Number of options outstanding at beginning of period (in shares) | 0 | 0 | 0
Granted during the year (in shares) | 17,505,672 | 0 | 0
Exercised during the year (in shares) | 0 | 0 | 0
Amended during the year (in shares) | 2,941,236 |  |
Forfeited during the year (in shares) | 0 | 0 | 0
Number of options outstanding at end of period (in shares) | 20,446,908 | 0 | 0
Weighted average exercise price outstanding, beginning balance (in us dollar per share) | $ / shares | $ 0 | $ 0 | $ 0
Weighted average fair value, granted during period (in us dollar per share) | $ / shares | 45.9 | 0 | 0
Weighted average fair value, exercised during period (in us dollar per share) | $ / shares | 0 | 0 | 0
Weighted average fair value, amended during period (in us dollar per share) | $ / shares | 19.1 |  |
Weighted average fair value, forfeited during period (in us dollar per share) | $ / shares | 0 | 0 | 0
Weighted average exercise price outstanding, ending balance (in us dollar per share) | $ / shares | $ 42.0 | $ 0 | $ 0
Warrants |  |  |
Reconciliation of Share Options [Roll Forward] |  |  |
Repurchased during the year (in shares) | (1,267,752) |  |
Number of share options outstanding at end of period, equivalent of Klarna Group plc Shares (in shares) | 26,730,252 |  |
Weighted average fair value, outstanding at end of period, equivalent of Klarna Group plc Shares (in us dollar per share) | $ / shares | $ 50.4 |  |
Warrants | Ordinary shares |  |  |
Reconciliation of Share Options [Roll Forward] |  |  |
Exercised during the year (in shares) | (2,400,000) |  |
Warrants | Klarna Group PLC subsidiary |  |  |
Reconciliation of Share Options [Roll Forward] |  |  |
Number of options outstanding at beginning of period (in shares) | 2,507,534 | 2,552,243 | 1,933,083
Granted during the year (in shares) | 0 | 360,590 | 1,102,024
Released during the year (in shares) | 0 | 0 | 0
Exercised during the year (in shares) | (90,000) | (126,580) | (65,346)
Repurchased during the year (in shares) | (105,646) |  |
Amended during the year (in shares) | 0 |  |
Forfeited during the year (in shares) | (84,367) | (278,719) | (417,518)
Number of options outstanding at end of period (in shares) | 2,227,521 | 2,507,534 | 2,552,243
Weighted average exercise price outstanding, beginning balance (in us dollar per share) | $ / shares | $ 543.0 | $ 538.0 | $ 515.0
Weighted average fair value, granted during period (in us dollar per share) | $ / shares | 0 | 515.0 | 578.0
Weighted average fair value, released during period (in us dollar per share) | $ / shares | 0 | 0 | 0
Weighted average fair value, exercised during period (in us dollar per share) | $ / shares | 231.0 | 162.0 | 76.0
Weighted average fair value, repurchased during period (in us dollar per share) | $ / shares | 441.0 |  |
Weighted average fair value, amended during period (in us dollar per share) | $ / shares | 0 |  |
Weighted average fair value, forfeited during period (in us dollar per share) | $ / shares | 631.0 | 505.0 | 226.0
Weighted average exercise price outstanding, ending balance (in us dollar per share) | $ / shares | $ 605.0 | $ 543.0 | $ 538.0
Share options | Chief Executive Officer |  |  |
Reconciliation of Share Options [Roll Forward] |  |  |
Amended during the year (in shares) | (1,477,164) |  |

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