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Provision for post-employment benefits - Life Expectancies For Defined Benefit Pension Plans (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Years life expectancy after age 65 - Current pensioners (at age 65) - male [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 22 years 2 months 12 days | 22 years 2 months 12 days
Years life expectancy after age 65 - Current pensioners (at age 65) - female [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 23 years 8 months 12 days | 23 years 10 months 24 days
Years life expectancy after age 65 - Future pensioners (current age 45) - male [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 23 years 9 months 18 days | 24 years
Years life expectancy after age 65 - Future pensioners (current age 45) - female [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 25 years 4 months 24 days | 25 years 8 months 12 days
North America [member] | Years life expectancy after age 65 - Current pensioners (at age 65) - male [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 21 years 10 months 24 days |
North America [member] | Years life expectancy after age 65 - Current pensioners (at age 65) - female [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 23 years 3 months 18 days |
North America [member] | Years life expectancy after age 65 - Future pensioners (current age 45) - male [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 23 years 4 months 24 days |
North America [member] | Years life expectancy after age 65 - Future pensioners (current age 45) - female [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 24 years 10 months 24 days |
United Kingdom [member] | Years life expectancy after age 65 - Current pensioners (at age 65) - male [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 23 years 1 month 6 days |
United Kingdom [member] | Years life expectancy after age 65 - Current pensioners (at age 65) - female [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 24 years 1 month 6 days |
United Kingdom [member] | Years life expectancy after age 65 - Future pensioners (current age 45) - male [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 24 years 8 months 12 days |
United Kingdom [member] | Years life expectancy after age 65 - Future pensioners (current age 45) - female [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 25 years 10 months 24 days |
Western Continental Europe [member] | Years life expectancy after age 65 - Current pensioners (at age 65) - male [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 20 years 9 months 18 days |
Western Continental Europe [member] | Years life expectancy after age 65 - Current pensioners (at age 65) - female [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 23 years 10 months 24 days |
Western Continental Europe [member] | Years life expectancy after age 65 - Future pensioners (current age 45) - male [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 23 years 2 months 12 days |
Western Continental Europe [member] | Years life expectancy after age 65 - Future pensioners (current age 45) - female [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 26 years |
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member] | Years life expectancy after age 65 - Current pensioners (at age 65) - male [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 14 years |
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member] | Years life expectancy after age 65 - Current pensioners (at age 65) - female [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 17 years 4 months 24 days |
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member] | Years life expectancy after age 65 - Future pensioners (current age 45) - male [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 14 years |
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member] | Years life expectancy after age 65 - Future pensioners (current age 45) - female [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial assumption of life expectancy | 17 years 4 months 24 days |

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