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Leases - Summary of Components of Right of Use Assets (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Leases [Line Items]    
Opening balance kr 7,870  
Depreciation (2,427) kr (2,451)
Impairment losses (154) (66)
Closing balance 6,320 7,870
Cost [member]    
Disclosure Of Leases [Line Items]    
Opening balance 17,196 14,857
Additions 1,565 1,954
Balances regarding acquired/divested business 2 334
Terminations (1,359) (897)
Translation differences (332) 948
Closing balance 17,072 17,196
Accumulated depreciation and amortization [member]    
Disclosure Of Leases [Line Items]    
Opening balance (8,556) (6,261)
Depreciation (2,427) (2,451)
Terminations 919 552
Translation differences 211 (396)
Closing balance (9,853) (8,556)
Accumulated impairment losses [member]    
Disclosure Of Leases [Line Items]    
Opening balance (374) (303)
Impairment losses (154) (66)
Terminations 3 27
Translation differences 11 (32)
Closing balance (514) (374)
Financial sublease [member]    
Disclosure Of Leases [Line Items]    
Opening balance (396) (345)
Derecognition for sublease (2) 0
Translation differences 13 (51)
Closing balance (385) (396)
Real estate [Member]    
Disclosure Of Leases [Line Items]    
Opening balance 7,336  
Closing balance 5,985 7,336
Real estate [Member] | Cost [member]    
Disclosure Of Leases [Line Items]    
Opening balance 15,895 13,756
Additions 1,307 1,650
Balances regarding acquired/divested business 2 334
Terminations (870) (719)
Translation differences (331) 874
Closing balance 16,003 15,895
Real estate [Member] | Accumulated depreciation and amortization [member]    
Disclosure Of Leases [Line Items]    
Opening balance (7,789) (5,687)
Depreciation (2,146) (2,141)
Terminations 546 393
Translation differences 209 (354)
Closing balance (9,180) (7,789)
Real estate [Member] | Accumulated impairment losses [member]    
Disclosure Of Leases [Line Items]    
Opening balance (374) (303)
Impairment losses (93) (66)
Terminations 3 27
Translation differences 11 (32)
Closing balance (453) (374)
Real estate [Member] | Financial sublease [member]    
Disclosure Of Leases [Line Items]    
Opening balance (396) (345)
Derecognition for sublease (2) 0
Translation differences 13 (51)
Closing balance (385) (396)
Vehicles [member]    
Disclosure Of Leases [Line Items]    
Opening balance 369  
Closing balance 280 369
Vehicles [member] | Cost [member]    
Disclosure Of Leases [Line Items]    
Opening balance 998 930
Additions 257 168
Balances regarding acquired/divested business 0  
Terminations (489) (178)
Translation differences 3 78
Closing balance 769 998
Vehicles [member] | Accumulated depreciation and amortization [member]    
Disclosure Of Leases [Line Items]    
Opening balance (629) (495)
Depreciation (232) (250)
Terminations 373 159
Translation differences (1) (43)
Closing balance (489) (629)
Vehicles [member] | Accumulated impairment losses [member]    
Disclosure Of Leases [Line Items]    
Opening balance 0  
Impairment losses 0  
Terminations 0  
Translation differences 0  
Closing balance 0 0
Vehicles [member] | Financial sublease [member]    
Disclosure Of Leases [Line Items]    
Opening balance 0  
Derecognition for sublease 0 0
Translation differences 0  
Closing balance 0 0
Other [member]    
Disclosure Of Leases [Line Items]    
Opening balance 165  
Closing balance 55 165
Other [member] | Cost [member]    
Disclosure Of Leases [Line Items]    
Opening balance 303 171
Additions 1 136
Balances regarding acquired/divested business 0  
Terminations 0  
Translation differences (4) (4)
Closing balance 300 303
Other [member] | Accumulated depreciation and amortization [member]    
Disclosure Of Leases [Line Items]    
Opening balance (138) (79)
Depreciation (49) (60)
Terminations 0  
Translation differences 3 1
Closing balance (184) (138)
Other [member] | Accumulated impairment losses [member]    
Disclosure Of Leases [Line Items]    
Opening balance 0  
Impairment losses (61)  
Terminations 0  
Translation differences 0  
Closing balance (61) 0
Other [member] | Financial sublease [member]    
Disclosure Of Leases [Line Items]    
Opening balance 0  
Derecognition for sublease 0 0
Translation differences 0  
Closing balance kr 0 kr 0