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Post-Employment Benefits - Summary of Pension Costs for Defined Contribution Plans and Defined Benefit Plans (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Defined Benefit Plans Expense Recognized In Income Statement [line items]      
Pension cost for defined contribution plans kr 3,464 kr 3,071 kr 2,881
Pension cost for defined benefit plans 3,179 3,486 2,942
Total kr 6,643 kr 6,557 kr 5,823
Total pension cost expressed as a percentage of wages and salaries 7.80% 8.90% 9.30%
Sweden [member]      
Disclosure of Defined Benefit Plans Expense Recognized In Income Statement [line items]      
Pension cost for defined contribution plans kr 1,223 kr 1,192 kr 1,199
Pension cost for defined benefit plans 2,013 2,144 1,920
Total 3,236 3,336 3,119
US [member]      
Disclosure of Defined Benefit Plans Expense Recognized In Income Statement [line items]      
Pension cost for defined contribution plans 522 542 460
Pension cost for defined benefit plans 67 160 97
Total 589 702 557
United Kingdom [member]      
Disclosure of Defined Benefit Plans Expense Recognized In Income Statement [line items]      
Pension cost for defined contribution plans 148 128 138
Pension cost for defined benefit plans (67) (22) (6)
Total 81 106 132
Other Countries [member]      
Disclosure of Defined Benefit Plans Expense Recognized In Income Statement [line items]      
Pension cost for defined contribution plans 1,571 1,209 1,084
Pension cost for defined benefit plans 1,166 1,204 931
Total kr 2,737 kr 2,413 kr 2,015