v3.19.1
Segment Information - Summary of Geographical Information (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of geographical areas [line items]      
Net sales kr 210,838 kr 205,378 kr 220,316
Non-current assets, total 51,206 50,037 76,719
Networks [member]      
Disclosure of geographical areas [line items]      
Net sales 138,570 132,285 140,076
Digital services [member]      
Disclosure of geographical areas [line items]      
Net sales 38,089 38,752 42,774
Managed services [member]      
Disclosure of geographical areas [line items]      
Net sales 25,770 26,472 28,780
Emerging business and other [member]      
Disclosure of geographical areas [line items]      
Net sales 8,409 7,869 8,686
South East Asia, Oceania and India [member]      
Disclosure of geographical areas [line items]      
Net sales 29,589 31,346 31,457
Non-current assets, total 445 512 690
South East Asia, Oceania and India [member] | Networks [member]      
Disclosure of geographical areas [line items]      
Net sales 21,337 23,367 23,741
South East Asia, Oceania and India [member] | Digital services [member]      
Disclosure of geographical areas [line items]      
Net sales 4,824 4,755 4,356
South East Asia, Oceania and India [member] | Managed services [member]      
Disclosure of geographical areas [line items]      
Net sales 3,388 3,216 3,355
South East Asia, Oceania and India [member] | Emerging business and other [member]      
Disclosure of geographical areas [line items]      
Net sales 40 8 5
North East Asia [member]      
Disclosure of geographical areas [line items]      
Net sales 22,309 23,583 26,993
Non-current assets, total 1,833 1,516 1,556
North East Asia [member] | Networks [member]      
Disclosure of geographical areas [line items]      
Net sales 15,915 16,239 18,694
North East Asia [member] | Digital services [member]      
Disclosure of geographical areas [line items]      
Net sales 4,849 5,463 6,777
North East Asia [member] | Managed services [member]      
Disclosure of geographical areas [line items]      
Net sales 1,465 1,867 1,513
North East Asia [member] | Emerging business and other [member]      
Disclosure of geographical areas [line items]      
Net sales 80 14 9
North America [member]      
Disclosure of geographical areas [line items]      
Net sales 58,586 52,001 51,951
Non-current assets, total 9,397 8,387 14,650
North America [member] | Networks [member]      
Disclosure of geographical areas [line items]      
Net sales 46,452 40,645 37,863
North America [member] | Digital services [member]      
Disclosure of geographical areas [line items]      
Net sales 8,358 8,035 7,986
North America [member] | Managed services [member]      
Disclosure of geographical areas [line items]      
Net sales 3,680 3,207 6,017
North America [member] | Emerging business and other [member]      
Disclosure of geographical areas [line items]      
Net sales 96 114 85
Europe and Latin America [member]      
Disclosure of geographical areas [line items]      
Net sales 60,272 56,801 62,493
Non-current assets, total 39,481 39,559 59,737
Europe and Latin America [member] | Networks [member]      
Disclosure of geographical areas [line items]      
Net sales 34,413 30,236 34,179
Europe and Latin America [member] | Digital services [member]      
Disclosure of geographical areas [line items]      
Net sales 12,339 12,147 14,584
Europe and Latin America [member] | Managed services [member]      
Disclosure of geographical areas [line items]      
Net sales 13,207 14,138 13,620
Europe and Latin America [member] | Emerging business and other [member]      
Disclosure of geographical areas [line items]      
Net sales 313 280 110
Middle East and Africa [member]      
Disclosure of geographical areas [line items]      
Net sales 23,629 24,965 27,372
Non-current assets, total 50 63 86
Middle East and Africa [member] | Networks [member]      
Disclosure of geographical areas [line items]      
Net sales 13,300 14,075 16,108
Middle East and Africa [member] | Digital services [member]      
Disclosure of geographical areas [line items]      
Net sales 6,284 6,800 6,987
Middle East and Africa [member] | Managed services [member]      
Disclosure of geographical areas [line items]      
Net sales 4,030 4,044 4,275
Middle East and Africa [member] | Emerging business and other [member]      
Disclosure of geographical areas [line items]      
Net sales 15 46 2
Other regions [member]      
Disclosure of geographical areas [line items]      
Net sales 16,453 16,682 20,050
Other regions [member] | Networks [member]      
Disclosure of geographical areas [line items]      
Net sales 7,153 7,723 9,491
Other regions [member] | Digital services [member]      
Disclosure of geographical areas [line items]      
Net sales 1,435 1,552 2,084
Other regions [member] | Emerging business and other [member]      
Disclosure of geographical areas [line items]      
Net sales 7,865 7,407 8,475
Sweden [member]      
Disclosure of geographical areas [line items]      
Net sales 2,315 3,334 3,365
Non-current assets, total 34,434 34,381 53,111
European union [member]      
Disclosure of geographical areas [line items]      
Net sales 35,941 36,472 38,783
Non-current assets, total 38,423 37,895 57,759
US [member]      
Disclosure of geographical areas [line items]      
Net sales 61,446 54,694 56,332
Non-current assets, total 8,349 7,092 11,053
China [member]      
Disclosure of geographical areas [line items]      
Net sales 14,601 14,983 18,886
Non-current assets, total kr 1,525 kr 1,123 kr 530