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Share-based payments - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
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Apr. 30, 2025 shares | May 31, 2024 USD ($) shares | Jun. 30, 2025 USD ($) | Dec. 31, 2025 USD ($) shares program $ / shares | Dec. 31, 2024 USD ($) shares $ / shares | Dec. 31, 2023 USD ($) shares $ / shares | Dec. 31, 2020 shares | Sep. 10, 2025 $ / shares | Mar. 31, 2025 USD ($) | Dec. 31, 2022 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Share-based payment, social security expense | $ |  |  |  | $ (9,000,000) | $ (13,000,000) | $ (300,000) |  |  |  |
Share-based payment, excluding social security expense | $ |  |  |  | $ 148,000,000 | 81,000,000 | 44,000,000 |  |  |  |
Share-based payment arrangements, vesting period |  |  |  | 4 years |  |  |  |  |  |
Share-based payments expense | $ |  |  |  | $ 156,000,000 | 93,000,000 | $ 43,000,000 |  |  |  |
Expected dividend, share options granted | $ |  |  |  | 0 |  |  |  |  |  |
Commercial agreement | Sales and marketing expenses |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Fair value of shares from share-based payment transactions | $ |  |  |  | 233,000,000 | $ 17,900,000 |  |  |  |  |
Commercial agreement | Sales and marketing expenses | Consumer acquisition services |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Fair value of shares from share-based payment transactions | $ |  |  |  | 50,000,000 |  |  |  |  |  |
Commercial agreement | Sales and marketing expenses | Brand awareness services |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Fair value of shares from share-based payment transactions | $ |  |  |  | $ 183,000,000 |  |  |  |  |  |
Management |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  | 8,834,736 | 400,065 |  |  |  |  |
Weighted average fair value, granted during period (in us dollar per share) | $ / shares |  |  |  | $ 104 |  |  |  |  |  |
Number of other equity instruments granted (in shares) |  |  |  | 108,960 | 216,468 |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of shares entitled (in shares) |  |  |  | 1 |  |  |  |  |  |
Number of options granted (in shares) |  |  |  | 299,572 |  |  |  |  |  |
IPO, offering share (USD per share) | $ / shares |  |  |  | $ 40.00 |  |  |  | $ 40.00 |  |
Ordinary shares | Chief Executive Officer |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Amended during the year (in shares) |  |  |  | 1,470,618 |  |  |  |  |  |
Share options, class C |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of shares entitled (in shares) |  |  |  | 2 |  |  |  |  |  |
Share options, class C | Chief Executive Officer |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  | 17,505,672 |  |  |  |  |  |
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 |  |  |  |  |  |
Amended during the year (in shares) |  |  |  | 2,941,236 |  |  |  |  |  |
Restricted share units |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of share-based payment arrangements programs | program |  |  |  | 2 |  |  |  |  |  |
Share-based payment arrangements, vesting period |  |  |  | 4 years |  |  |  |  |  |
Number of other equity instruments granted (in shares) |  |  |  | 1,026,951 | 0 | 0 |  |  |  |
Number of other equity instruments outstanding in share-based payment arrangement |  |  |  | 998,907 | 0 | 0 |  |  |  | 0
Restricted share units | Klarna Group PLC subsidiary |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted (in shares) |  |  |  | 123,335 | 22,659,832 | 7,081,803 |  |  |  |
Number of other equity instruments released (in shares) |  |  |  | 8,225,629 | 3,164,977 | 2,411,162 |  |  |  |
Number of other equity instruments outstanding in share-based payment arrangement |  |  |  | 14,597,215 | 26,411,646 | 10,208,104 |  |  |  | 7,988,295
Restricted share units | Ordinary shares |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  | 2,563,600 |  |  |  |  |  |
Legacy RSU Program |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Share-based payment arrangements, vesting period |  |  |  |  |  |  | 4 years |  |  |
Share-based payment arrangements, vesting percentage |  |  |  |  |  |  | 25.00% |  |  |
Share exchange ratio |  |  |  | 0.25 | 0.25 | 0.24 |  |  |  |
Legacy RSU Program | Ordinary shares |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of shares received per award vested (in shares) |  |  |  |  |  |  | 1 |  |  |
Klarna Group PLC RSU |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Share-based payment arrangements, vesting period |  |  |  | 4 years |  |  |  |  |  |
Share-based payment arrangements, vesting percentage |  |  |  | 25.00% |  |  |  |  |  |
Klarna Group PLC RSU | Ordinary shares |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of shares received per award vested (in shares) |  |  |  | 1 |  |  |  |  |  |
Share warrants and share options |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Share exchange ratio |  |  |  | 12 | 12 | 12 |  |  |  |
Number of options granted (in shares) |  |  |  | 24,909,751 | 6,100,140 | 0 |  |  |  |
Weighted average fair value, granted during period (in us dollar per share) | $ / shares |  |  |  | $ 57.0 | $ 46.0 | $ 0 |  |  |  |
Weighted average fair value, amended during period (in us dollar per share) | $ / shares |  |  |  | $ 38.2 |  |  |  |  |  |
Amended during the year (in shares) |  |  |  | 1,477,164 |  |  |  |  |  |
Number of options exercised (in shares) |  |  |  | 2,400,000 | 0 | 0 |  |  |  |
Share warrants and share options | Minimum |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Share-based payment arrangements, vesting period |  |  |  | 4 years |  |  |  |  |  |
Share warrants and share options | Maximum |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Share-based payment arrangements, vesting period |  |  |  | 5 years |  |  |  |  |  |
Share warrants and share options | Ordinary shares |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of shares received per award vested (in shares) |  |  |  | 1 |  |  |  |  |  |
KHAB Warrants |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of share options repurchased and not vested in share-ased payment arrangement (in shares) |  |  |  | 6,456 |  |  |  |  |  |
KHAB Warrants | Sales and marketing expenses |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Share-based payments expense | $ |  |  |  | $ 100,000 |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of options repurchased (in shares) |  |  |  | 1,267,752 |  |  |  |  |  |
Share repurchase, amount | $ |  |  |  | $ 17,200,000 |  |  |  |  |  |
Weighted average remaining contractual life |  |  |  | 4 years 2 months 12 days | 3 years |  |  |  |  |
Number of share options exercisable (in shares) |  |  |  | 2,145,590 | 1,299,360 |  |  |  |  |
Warrants | Minimum |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Range of exercise prices (USD per share) | $ / shares |  |  |  | $ 34 | $ 34 |  |  |  |  |
Warrants | Maximum |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Range of exercise prices (USD per share) | $ / shares |  |  |  | $ 51 | $ 51 |  |  |  |  |
Warrants | Commercial agreement |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted (in shares) |  |  |  | 15,740,059 | 1,299,360 |  |  |  |  |
Number of options vested (in shares) |  |  |  | 3,910,393 |  |  |  |  |  |
Number of options exercised (in shares) |  |  |  | 2,400,000 |  |  |  |  |  |
Share-based payment arrangement, requisite service period |  |  |  | 5 years |  |  |  |  |  |
Share-based payments expense | $ |  |  |  | $ 27,000,000 |  |  |  |  |  |
Deferred expense to be recognized from share-ased payment transactions | $ |  |  |  | $ 75,000,000 |  |  |  |  |  |
Current tax liabilities | $ |  |  |  |  |  |  |  |  | $ 48,000,000 |
Decrease in current tax liability | $ |  |  | $ 22,000,000 |  |  |  |  |  |  |
Warrants | Management |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of options repurchased (in shares) |  |  |  | 17,500 |  |  |  |  |  |
Warrants | Employee |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Employee restricted share unit program | $ |  |  |  | $ 0 |  |  |  |  |  |
Warrants | Klarna Group PLC subsidiary |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  | 0 | 360,590 | 1,102,024 |  |  |  |
Weighted average fair value, granted during period (in us dollar per share) | $ / shares |  |  |  | $ 0 | $ 515.0 | $ 578.0 |  |  |  |
Weighted average fair value, amended during period (in us dollar per share) | $ / shares |  |  |  | $ 0 |  |  |  |  |  |
Amended during the year (in shares) |  |  |  | 0 |  |  |  |  |  |
Number of options exercised (in shares) |  |  |  | 90,000 | 126,580 | 65,346 |  |  |  |
Number of options repurchased (in shares) |  |  |  | 105,646 |  |  |  |  |  |
Weighted average remaining contractual life |  |  |  | 1 year 10 months 24 days | 2 years 8 months 12 days | 3 years 6 months |  |  |  |
Number of share options exercisable (in shares) |  |  |  | 0 | 40,000 | 51,500 |  |  |  |
Weighted average fair value at measurement date, share options granted | $ |  |  |  |  | $ 17 | $ 16 |  |  |  |
Warrants | Klarna Group PLC subsidiary | Minimum |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Range of exercise prices (USD per share) | $ / shares |  |  |  | $ 0.10 | $ 0.10 | $ 0.10 |  |  |  |
Warrants | Klarna Group PLC subsidiary | Maximum |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Range of exercise prices (USD per share) | $ / shares |  |  |  | $ 1,508 | $ 1,508 | $ 1,508 |  |  |  |
Warrants | Ordinary shares |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of options exercised (in shares) |  |  |  | 2,400,000 |  |  |  |  |  |
Warrants | Ordinary shares | Commercial agreement |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of shares received per award vested (in shares) |  |  |  | 1 | 1 |  |  |  |  |
Share options |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Share-based payment arrangements, vesting period |  |  |  | 4 years |  |  |  |  |  |
Weighted average remaining contractual life |  |  |  | 3 years 4 months 24 days | 3 years 7 months 6 days |  |  |  |  |
Number of share options exercisable (in shares) |  |  |  | 2,935,177 | 1,460,856 |  |  |  |  |
Weighted average fair value at measurement date, share options granted | $ |  |  |  | $ 53 | $ 9 |  |  |  |  |
Share options | Minimum |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Range of exercise prices (USD per share) | $ / shares |  |  |  | $ 38 | $ 38 |  |  |  |  |
Share options | Maximum |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Range of exercise prices (USD per share) | $ / shares |  |  |  | $ 114 | $ 114 |  |  |  |  |
Share options | Chief Executive Officer |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Amended during the year (in shares) |  |  |  | 1,477,164 |  |  |  |  |  |
Share options, class C |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  | 17,505,672 | 0 | 0 |  |  |  |
Weighted average fair value, granted during period (in us dollar per share) | $ / shares |  |  |  | $ 45.9 | $ 0 | $ 0 |  |  |  |
Weighted average fair value, amended during period (in us dollar per share) | $ / shares |  |  |  | $ 19.1 |  |  |  |  |  |
Amended during the year (in shares) |  |  |  | (2,941,236) |  |  |  |  |  |
Number of options exercised (in shares) |  |  |  | 0 | 0 | 0 |  |  |  |
Weighted average remaining contractual life |  |  |  | 3 years 8 months 12 days |  |  |  |  |  |
Number of share options exercisable (in shares) |  |  |  | 9,523,581 | 0 |  |  |  |  |
Weighted average fair value at measurement date, share options granted | $ |  |  |  | $ 29 |  |  |  |  |  |
Share options, class C | Minimum |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Range of exercise prices (USD per share) | $ / shares |  |  |  | $ 19 |  |  |  |  |  |
Share options, class C | Maximum |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Range of exercise prices (USD per share) | $ / shares |  |  |  | $ 57 |  |  |  |  |  |
Equity-related instruments, business acquisition |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of other equity instruments released (in shares) |  | 329,484 |  |  |  |  |  |  |  |
Weighted average fair value at measurement date, other equity instruments granted (in USD per share) | $ |  | $ 51 |  |  |  |  |  |  |  |
Number of other equity instruments outstanding in share-based payment arrangement |  |  |  |  | 0 |  |  |  |  |
Employee Equity Program |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Share-based payments expense | $ |  |  |  |  |  | $ 0 |  |  |  |
Number of ordinary shares held (in shares) | 28,762 |  |  |  |  |  |  |  |  |
Number of ordinary shares exchanged (in shares) | 1,948,166 |  |  |  |  |  |  |  |  |
Employee Equity Program | Klarna Holding AB |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of ordinary shares held (in shares) |  |  |  |  | 28,762 | 31,122 |  |  |  |
Number of ordinary shares exchanged (in shares) |  |  |  |  | 2,347 | 10,693 |  |  |  |
Employee Equity Program | Ordinary shares |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  | 1,948,166 |  |  |  |  |  |
Direct Share Issuance |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted (in shares) |  |  |  | 150,760 | 216,468 |  |  |  |  |
Direct Share Issuance | Ordinary shares |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |
Weighted average fair value at measurement date, other equity instruments granted (in USD per share) | $ |  |  |  | $ 34 | $ 34 |  |  |  |  |

X
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