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Net profit (loss) per share (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Earnings per share [abstract]
Net profit (loss) attributable to shareholders of Klarna Group plc	$ (294)	$ 3	$ (249)
Weighted average number of ordinary shares - basic (in shares)	370,654,083	363,993,690	362,090,644
Dilutive potential ordinary shares (in shares)	0	418,379	0
Weighted average number of ordinary shares - diluted (in shares)	370,654,083	364,412,068	362,090,644
Net profit (loss) per share attributable to shareholders of Klarna Group plc, basic (in USD per share)	$ (0.79)	$ 0.01	$ (0.69)
Net profit (loss) per share attributable to shareholders of Klarna Group plc, diluted (in USD per share)	$ (0.79)	$ 0.01	$ (0.69)

X

- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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Number of potential ordinary shares that are antidilutive in the period presented.

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The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)]

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