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Leases - Summary of Components of Right of Use Assets (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Leases [Line Items]    
Opening balance kr 6,320  
Depreciation (2,179) kr (2,427)
Impairment losses (99) (154)
Closing balance 6,487 6,320
Cost [member]    
Disclosure Of Leases [Line Items]    
Opening balance 17,072 17,196
Additions 2,560 1,565
Balances regarding acquired/divested business (31) 2
Terminations (2,064) (1,359)
Translation differences 639 (332)
Closing balance 18,176 17,072
Accumulated depreciation and amortization [member]    
Disclosure Of Leases [Line Items]    
Opening balance (9,853) (8,556)
Depreciation (2,179) (2,427)
Balances regarding acquired/divested business 31 0
Terminations 1,673 919
Translation differences (350) 211
Closing balance (10,678) (9,853)
Accumulated impairment losses [member]    
Disclosure Of Leases [Line Items]    
Opening balance (514) (374)
Impairment losses (99) (154)
Terminations 47 3
Translation differences (24) 11
Closing balance (590) (514)
Financial sublease [member]    
Disclosure Of Leases [Line Items]    
Opening balance (385) (396)
Derecognition for sublease 0 (2)
Translation differences (36) 13
Closing balance (421) (385)
Real estate [Member]    
Disclosure Of Leases [Line Items]    
Opening balance 5,985  
Closing balance 6,123 5,985
Real estate [Member] | Cost [member]    
Disclosure Of Leases [Line Items]    
Opening balance 16,003 15,895
Additions 2,295 1,307
Balances regarding acquired/divested business (31) 2
Terminations (1,794) (870)
Translation differences 606 (331)
Closing balance 17,079 16,003
Real estate [Member] | Accumulated depreciation and amortization [member]    
Disclosure Of Leases [Line Items]    
Opening balance (9,180) (7,789)
Depreciation (1,950) (2,146)
Balances regarding acquired/divested business 31 0
Terminations 1,421 546
Translation differences (328) 209
Closing balance (10,006) (9,180)
Real estate [Member] | Accumulated impairment losses [member]    
Disclosure Of Leases [Line Items]    
Opening balance (453) (374)
Impairment losses (99) (93)
Terminations 47 3
Translation differences (24) 11
Closing balance (529) (453)
Real estate [Member] | Financial sublease [member]    
Disclosure Of Leases [Line Items]    
Opening balance (385) (396)
Derecognition for sublease 0 (2)
Translation differences (36) 13
Closing balance (421) (385)
Vehicles [member]    
Disclosure Of Leases [Line Items]    
Opening balance 280  
Closing balance 344 280
Vehicles [member] | Cost [member]    
Disclosure Of Leases [Line Items]    
Opening balance 769 998
Additions 265 257
Balances regarding acquired/divested business 0 0
Terminations (270) (489)
Translation differences 22 3
Closing balance 786 769
Vehicles [member] | Accumulated depreciation and amortization [member]    
Disclosure Of Leases [Line Items]    
Opening balance (489) (629)
Depreciation (190) (232)
Balances regarding acquired/divested business 0 0
Terminations 252 373
Translation differences (15) (1)
Closing balance (442) (489)
Vehicles [member] | Accumulated impairment losses [member]    
Disclosure Of Leases [Line Items]    
Opening balance 0 0
Impairment losses 0 0
Terminations 0 0
Translation differences 0 0
Closing balance 0 0
Vehicles [member] | Financial sublease [member]    
Disclosure Of Leases [Line Items]    
Opening balance 0 0
Derecognition for sublease 0 0
Translation differences 0 0
Closing balance 0 0
Other [member]    
Disclosure Of Leases [Line Items]    
Opening balance 55  
Closing balance 20 55
Other [member] | Cost [member]    
Disclosure Of Leases [Line Items]    
Opening balance 300 303
Additions 0 1
Balances regarding acquired/divested business 0 0
Terminations 0 0
Translation differences 11 (4)
Closing balance 311 300
Other [member] | Accumulated depreciation and amortization [member]    
Disclosure Of Leases [Line Items]    
Opening balance (184) (138)
Depreciation (39) (49)
Balances regarding acquired/divested business 0 0
Terminations 0 0
Translation differences (7) 3
Closing balance (230) (184)
Other [member] | Accumulated impairment losses [member]    
Disclosure Of Leases [Line Items]    
Opening balance (61) 0
Impairment losses 0 (61)
Terminations 0 0
Translation differences 0 0
Closing balance (61) (61)
Other [member] | Financial sublease [member]    
Disclosure Of Leases [Line Items]    
Opening balance 0 0
Derecognition for sublease 0 0
Translation differences 0 0
Closing balance kr 0 kr 0