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Employee Information - Summary of Average Number of Employees (Detail) - Employee | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of Information About Employees [line items] |  |
Average number of employees | 98,589 | 94,503
Women [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 23,644 | 22,096
Men [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 74,945 | 72,407
South East Asia, Oceania and India [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 25,331 | 24,051
South East Asia, Oceania and India [member] | Women [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 5,025 | 4,821
South East Asia, Oceania and India [member] | Men [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 20,306 | 19,230
North East Asia [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 13,876 | 13,379
North East Asia [member] | Women [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 4,532 | 4,376
North East Asia [member] | Men [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 9,344 | 9,003
North America [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 9,710 | 9,361
North America [member] | Women [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 2,075 | 1,980
North America [member] | Men [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 7,635 | 7,381
Europe and Latin America [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 45,431 | 43,442
Europe and Latin America [member] | Women [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 11,205 | 10,180
Europe and Latin America [member] | Men [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 34,226 | 33,262
Middle East and Africa [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 4,241 | 4,270
Middle East and Africa [member] | Women [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 807 | 739
Middle East and Africa [member] | Men [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 3,434 | 3,531
Sweden [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 12,620 | 12,047
Sweden [member] | Women [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 2,911 | 2,723
Sweden [member] | Men [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 9,709 | 9,324
Of which in EU [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 34,273 | 34,326
Of which in EU [member] | Women [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 8,462 | 8,069
Of which in EU [member] | Men [member] |  |
Disclosure of Information About Employees [line items] |  |
Average number of employees | 25,811 | 26,257

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- Definition The average number of personnel employed by the entity during a period. + 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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