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Earnings Per Share - Schedule of Earnings Per Share (Detail) - SEK (kr) kr / shares in Units, shares in Millions, kr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Basic
Net income (loss) attributable to owners of the Parent Company (SEK million)	kr 20	kr (26,446)	kr 18,724
Average number of shares outstanding, basic (millions)	3,332	3,330	3,330
Earnings (loss) per share attributable to owners of the Parent Company, basic (SEK)	kr 0.01	kr (7.94)	kr 5.62
Diluted
Net income (loss) attributable to owners of the Parent Company (SEK million)	kr 20	kr (26,446)	kr 18,724
Average number of shares outstanding, basic (millions)	3,332	3,330	3,330
Dilutive effect for share-based compensation programs (millions)	7	0	4
Average number of shares outstanding, diluted (millions)	3,339	3,330	3,334
Earnings (loss) per share attributable to owners of the Parent Company, diluted (SEK)	kr 0.01	kr (7.94)	kr 5.62

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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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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