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Leases - Summary of Components of Right of Use Assets (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Leases [Line Items] |  |  |
Opening balance | kr 8,487 |  |
Depreciation | (2,387) | kr (2,474) |
Impairment losses | (696) | (490) | kr (1,097)
Closing balance | 7,980 | 8,487 |
Net carrying value | 7,980 | 8,487 |
Cost [member] |  |  |
Disclosure Of Leases [Line Items] |  |  |
Opening balance | 12,087 | 9,729 |
Additions | 2,604 | 2,300 |
Balances regarding acquired/divested business | 126 | (21) |
Terminations | (1,056) | (156) |
Translation differences | (983) | 235 |
Closing balance | 12,778 | 12,087 | 9,729
Accumulated depreciation and amortization [member] |  |  |
Disclosure Of Leases [Line Items] |  |  |
Opening balance | (2,414) |  |
Depreciation | (2,387) | (2,474) |
Balances regarding acquired/divested business | 1 | 1 |
Terminations | 347 | 36 |
Translation differences | 308 | 23 |
Closing balance | (4,145) | (2,414) |
Accumulated impairment losses [member] |  |  |
Disclosure Of Leases [Line Items] |  |  |
Opening balance | (872) | (767) |
Impairment losses | (47) | (75) |
Terminations | 553 |  |
Translation differences | 26 | (30) |
Closing balance | (340) | (872) | (767)
Financial sublease [member] |  |  |
Disclosure Of Leases [Line Items] |  |  |
Opening balance | (314) | (311) |
Derecognition | (42) | 2 |
Translation differences | 43 | (5) |
Closing balance | (313) | (314) | (311)
Real estate [member] |  |  |
Disclosure Of Leases [Line Items] |  |  |
Impairment losses | (47) | (75) |
Net carrying value | 7,431 | 7,951 |
Real estate [member] | Cost [member] |  |  |
Disclosure Of Leases [Line Items] |  |  |
Opening balance | 11,263 | 9,151 |
Additions | 2,220 | 2,035 |
Balances regarding acquired/divested business | 126 | (21) |
Terminations | (926) | (127) |
Translation differences | (899) | 225 |
Closing balance | 11,784 | 11,263 | 9,151
Real estate [member] | Accumulated depreciation and amortization [member] |  |  |
Disclosure Of Leases [Line Items] |  |  |
Opening balance | (2,126) |  |
Depreciation | (2,082) | (2,162) |
Balances regarding acquired/divested business | 1 | 1 |
Terminations | 238 | 14 |
Translation differences | 269 | 21 |
Closing balance | (3,700) | (2,126) |
Real estate [member] | Accumulated impairment losses [member] |  |  |
Disclosure Of Leases [Line Items] |  |  |
Opening balance | (872) | (767) |
Impairment losses | (47) | (75) |
Terminations | 553 |  |
Translation differences | 26 | (30) |
Closing balance | (340) | (872) | (767)
Real estate [member] | Financial sublease [member] |  |  |
Disclosure Of Leases [Line Items] |  |  |
Opening balance | (314) | (311) |
Derecognition | (42) | 2 |
Translation differences | 43 | (5) |
Closing balance | (313) | (314) | (311)
Vehicles [member] |  |  |
Disclosure Of Leases [Line Items] |  |  |
Net carrying value | 433 | 438 |
Vehicles [member] | Cost [member] |  |  |
Disclosure Of Leases [Line Items] |  |  |
Opening balance | 698 | 452 |
Additions | 339 | 265 |
Terminations | (130) | (29) |
Translation differences | (84) | 10 |
Closing balance | 823 | 698 | 452
Vehicles [member] | Accumulated depreciation and amortization [member] |  |  |
Disclosure Of Leases [Line Items] |  |  |
Opening balance | (260) |  |
Depreciation | (277) | (284) |
Terminations | 109 | 22 |
Translation differences | 38 | 2 |
Closing balance | (390) | (260) |
Other [member] |  |  |
Disclosure Of Leases [Line Items] |  |  |
Net carrying value | 116 | 98 |
Other [member] | Cost [member] |  |  |
Disclosure Of Leases [Line Items] |  |  |
Opening balance | 126 | 126 |
Additions | 45 |  |
Closing balance | 171 | 126 | kr 126
Other [member] | Accumulated depreciation and amortization [member] |  |  |
Disclosure Of Leases [Line Items] |  |  |
Opening balance | (28) |  |
Depreciation | (28) | (28) |
Translation differences | 1 |  |
Closing balance | kr (55) | kr (28) |

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