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Financial Risk Management - Summary of Aging Analysis of Gross Values of Trade Receivables and Contracts Assets by Risk Category (Detail) - SEK (kr) kr in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | kr 58,303 | kr 55,854
Not due [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 52,602 | 50,130
Maturity within 3 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 2,094 | 2,154
Later than 3 months and not later than 6 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 672 | 624
2021 [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 541 | 726
Longer than 1 year [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 2,394 | 2,220
Country risk Low [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 37,929 | 34,613
Country risk Low [member] | Not due [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 36,439 | 33,620
Country risk Low [member] | Maturity within 3 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 976 | 517
Country risk Low [member] | Later than 3 months and not later than 6 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 171 | 63
Country risk Low [member] | 2021 [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 51 | 105
Country risk Low [member] | Longer than 1 year [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 292 | 308
Country risk medium [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 13,971 | 16,167
Country risk medium [member] | Not due [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 12,119 | 13,487
Country risk medium [member] | Maturity within 3 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 689 | 1,243
Country risk medium [member] | Later than 3 months and not later than 6 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 208 | 338
Country risk medium [member] | 2021 [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 220 | 346
Country risk medium [member] | Longer than 1 year [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 735 | 753
Country risk high [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 6,403 | 5,074
Country risk high [member] | Not due [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 4,044 | 3,023
Country risk high [member] | Maturity within 3 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 429 | 394
Country risk high [member] | Later than 3 months and not later than 6 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 293 | 223
Country risk high [member] | 2021 [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 270 | 275
Country risk high [member] | Longer than 1 year [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | kr 1,367 | kr 1,159

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