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Leases - Summary of Components of Right of Use Assets (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Leases [Line Items] |  |
Opening balance | kr 7,980 |
Depreciation | (2,277) | kr (2,387)
Impairment losses | 0 | (47)
Closing balance | 7,948 | 7,980
Net carrying value | 7,948 | 7,980
Cost [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | 12,778 | 12,087
Additions | 2,017 | 2,604
Balances regarding acquired/divested business | (21) | 126
Terminations | (575) | (1,056)
Translation differences | 658 | (983)
Closing balance | 14,857 | 12,778
Accumulated depreciation and amortization [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (4,145) | (2,414)
Depreciation | (2,277) | (2,387)
Balances regarding acquired/divested business | 14 | 1
Terminations | 391 | 347
Translation differences | (244) | 308
Closing balance | (6,261) | (4,145)
Accumulated impairment losses [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (340) | (872)
Impairment losses |  | (47)
Terminations | 63 | 553
Translation differences | (26) | 26
Closing balance | (303) | (340)
Financial sublease [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (313) | (314)
Derecognition |  | (42)
Translation differences | (32) | 43
Closing balance | (345) | (313)
Real estate [Member] |  |
Disclosure Of Leases [Line Items] |  |
Net carrying value | 7,421 | 7,431
Real estate [Member] | Cost [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | 11,784 | 11,263
Additions | 1,759 | 2,220
Balances regarding acquired/divested business | (10) | 126
Terminations | (395) | (926)
Translation differences | 618 | (899)
Closing balance | 13,756 | 11,784
Real estate [Member] | Accumulated depreciation and amortization [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (3,700) | (2,126)
Depreciation | (2,002) | (2,082)
Balances regarding acquired/divested business | 8 | 1
Terminations | 233 | 238
Translation differences | (226) | 269
Closing balance | (5,687) | (3,700)
Real estate [Member] | Accumulated impairment losses [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (340) | (872)
Impairment losses |  | (47)
Terminations | 63 | 553
Translation differences | (26) | 26
Closing balance | (303) | (340)
Real estate [Member] | Financial sublease [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (313) | (314)
Derecognition |  | (42)
Translation differences | (32) | 43
Closing balance | (345) | (313)
Vehicles [member] |  |
Disclosure Of Leases [Line Items] |  |
Net carrying value | 435 | 433
Vehicles [member] | Cost [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | 823 | 698
Additions | 258 | 339
Balances regarding acquired/divested business | (11) |
Terminations | (180) | (130)
Translation differences | 40 | (84)
Closing balance | 930 | 823
Vehicles [member] | Accumulated depreciation and amortization [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (390) | (260)
Depreciation | (251) | (277)
Balances regarding acquired/divested business | 6 |
Terminations | 158 | 109
Translation differences | (18) | 38
Closing balance | (495) | (390)
Other [member] |  |
Disclosure Of Leases [Line Items] |  |
Net carrying value | 92 | 116
Other [member] | Cost [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | 171 | 126
Additions |  | 45
Closing balance | 171 | 171
Other [member] | Accumulated depreciation and amortization [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (55) | (28)
Depreciation | (24) | (28)
Translation differences |  | 1
Closing balance | kr (79) | kr (55)

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