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Taxation - Summary of Reconciliation of Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of average effective tax rate and applicable tax rate [Abstract]
Computed rate of tax	26.00%	26.00%	24.00%
Incentive tax credits	(4.00%)	(4.00%)	(5.00%)
Withholding tax on dividends	2.00%	3.00%	2.00%
Expenses not deductible for tax purposes	1.00%	1.00%	1.00%
Irrecoverable withholding tax	1.00%	1.00%	2.00%
Income tax reserve adjustments - current and prior year		(1.00%)	2.00%
Transfer to/(from) unrecognised deferred tax assets	1.00%		1.00%
Others	(1.00%)
Underlying effective tax rate	26.00%	26.00%	27.00%
Non-underlying items within operating profit	1.00%		1.00%
Premium paid on buy back of preference shares	1.00%
Impact of US tax reform	(7.00%)
Effective tax rate	21.00%	26.00%	28.00%

X

- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2016-01-13
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_c_ii&doctype=Standard
-URIDate 2016-03-31

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X

- Definition

The tax expense (income) divided by the accounting profit. [Refer: Accounting profit]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2016-01-13
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_c_ii&doctype=Standard
-URIDate 2016-03-31

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- Definition

The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the expenses not deductible in determining taxable profit. [Refer: Average effective tax rate; Applicable tax rate]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2016-01-13
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_c_ii&doctype=Standard
-URIDate 2016-03-31

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Tax rate effect impact of US federal tax reform.

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- Definition

The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from incentive tax credit.

+ References

No definition available.

+ Details

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X

- Definition

Tax rate effect of income tax reserve adjustments current and prior periods.

+ References

No definition available.

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- Definition

The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from irrecoverable withholding tax.

+ References

No definition available.

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- Definition

Tax rate effect of non-underlying items within operating profit.

+ References

No definition available.

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- Definition

Tax rate effect of premium paid on buy back of preference shares.

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- Definition

The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from transfer to/(from) unrecognised deferred tax assets.

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- Definition

The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from withholding tax on dividends.

+ References

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- Definition

Tax rate effect others.

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No definition available.

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- Definition

Underlying effective tax rate.

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