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Employee Information - Summary of Number of Employees by Market Area (Detail) - Employee | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of Information About Employees [line items] |  |
Number of employees | 100,824 | 99,417
South East Asia, Oceania and India [member] |  |
Disclosure of Information About Employees [line items] |  |
Number of employees | 25,869 | 24,559
North East Asia [member] |  |
Disclosure of Information About Employees [line items] |  |
Number of employees | 13,944 | 13,783
North America [member] |  |
Disclosure of Information About Employees [line items] |  |
Number of employees | 10,175 | 9,643
Europe and Latin America [member] |  |
Disclosure of Information About Employees [line items] |  |
Number of employees | 46,580 | 47,135
Middle East and Africa [member] |  |
Disclosure of Information About Employees [line items] |  |
Number of employees | 4,256 | 4,297
Sweden [member] |  |
Disclosure of Information About Employees [line items] |  |
Number of employees | 13,173 | 12,730
Of which in EU [member] |  |
Disclosure of Information About Employees [line items] |  |
Number of employees | 35,552 | 37,989

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- Definition The number of personnel employed by the entity at a date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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