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Provision for post-employment benefits - Weighted Average Assumptions Used For Actuarial Valuations (Detail)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
United Kingdom [member]
Disclosure of defined benefit plans [line items]
Discount rate	2.80%	2.40%	2.50%	3.70%
Rate of increase in salaries			3.50%	3.10%
Rate of increase in pensions in payment	4.30%	4.10%	4.10%	3.90%
Inflation	2.80%	2.70%	2.80%	2.40%
North America [member]
Disclosure of defined benefit plans [line items]
Discount rate	4.10%	3.50%	3.80%	4.00%
Rate of increase in salaries	3.00%	3.10%	3.10%	3.00%
Inflation		4.00%	4.00%	2.50%
Western Continental Europe [member]
Disclosure of defined benefit plans [line items]
Discount rate	2.00%	1.90%	1.70%	2.50%
Rate of increase in salaries	2.30%	1.90%	2.00%	2.30%
Rate of increase in pensions in payment	1.20%	1.20%	1.30%	1.60%
Inflation	1.70%	1.70%	1.70%	2.00%
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member]
Disclosure of defined benefit plans [line items]
Discount rate	5.00%	4.20%	4.20%	4.20%
Rate of increase in salaries	5.80%	5.50%	5.90%	5.80%
Inflation	3.60%	4.00%	4.00%	4.00%

X

- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The expected rate of increases in pension that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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