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Financial instruments and risk management - Summary of credit ratings (Detail) - Capital and liquidity risk management [member]	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Long term rating [member]
Disclosure of external credit grades [Line Items]
Credit ratings	A/A3	A-/A3
Short term rating [member]
Disclosure of external credit grades [Line Items]
Credit ratings	A-1/P-2	A-1/P-2
Outlook [member]
Disclosure of external credit grades [Line Items]
Credit ratings	Stable/Stable	Positive/Stable

X

- Definition

The description of the information used to assess the credit quality of financial assets with credit risk that are neither past due nor impaired that the entity does not separately disclose. [Refer: Credit risk [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Note Expiry date 2018-01-01
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-Number 7
-IssueDate 2017-01-01
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-Subparagraph d
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-URIDate 2017-03-09

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-Note Expiry date 2018-01-01
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-IssueDate 2017-01-01
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-URIDate 2017-03-09

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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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- Details

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- Details

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- Details

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