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Treasury risk management - Summary of Currency Derivatives Outstanding (Detail) | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about hedges [line items] |  |  |
Derivative Instruments Outstanding |  | (1,202) | (889)
EUR [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Derivative Instruments Outstanding | [1] | (920) | (743)
GBP [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Derivative Instruments Outstanding |  | (414) | (325)
USD [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Derivative Instruments Outstanding |  | 588 | 640
SEK [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Derivative Instruments Outstanding |  | (100) | (94)
CAD [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Derivative Instruments Outstanding |  | (110) | (108)
PLN [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Derivative Instruments Outstanding |  | (70) | (67)
Other [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Derivative Instruments Outstanding |  | (176) | (192)
[1] | Euro exposure relates to group companies having non-euro functional currencies.

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