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Post-Employment and Other Non-current Employee Benefits - Summary of Amounts Recognized in Consolidated Income Statements and Consolidated Statements of Comprehensive Income (Parenthetical) (Detail)	Dec. 31, 2017	Dec. 31, 2016
Actuarial assumption of discount rates [member]
Disclosure of defined benefit plans [line items]
Discount rate used to calculate the defined benefit obligation and the net interest on the net defined benefit liability (asset)	0.50%	(0.50%)

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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.

+ Details

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- Definition

Discount rate used to calculate the defined benefit obligation and the net interest on the net defined benefit liability (asset) .

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	instant

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- Details

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