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Inventories - Movements in Obsolescence Allowances (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Inventories [Abstract] |  |  |
Inventory obsolescence allowances, Opening balance | kr 3,386 | kr 2,611 | kr 2,425
Additions, net | 2,266 | 2,228 | 1,079
Utilization | (1,781) | (1,459) | (987)
Translation differences | (244) | 22 | 94
Balances regarding acquired/divested businesses |  | (16) |
Inventory obsolescence allowances, Closing balance | kr 3,627 | kr 3,386 | kr 2,611

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