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Post-Employment Benefits - Summary of Total Remeasurements in Other Comprehensive Income (Loss) Related to Post-Employment Benefits (Detail) - SEK (kr)
kr in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Remeasurement Of Other Comprehensive Income Loss Related To Post Employment Benefits [Abstract]    
Actuarial gains and losses (+/–) kr 538 kr 8,943
The effect of asset ceiling (87) 127
Swedish special payroll taxes 454 1,599
Total kr 905 kr 10,669