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Intangible Assets - Summary of Key Assumptions and Sensitivity Analysis Relating to Cash Generating Units (Detail) - Three cash generating units [Member]	12 Months Ended
	Dec. 31, 2021
Disclosure of information for cash-generating units [line items]
Reduction in EBITDA (as defined) margin	5.3
Reduction in long-term growth rate	3.2
Increase in pre-tax discount rate	2.7

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Reduction in EBITDA margin (being earnings before interest, taxes, depreciation, amortisation, asset impairment charges, profit on disposals and the Group's share of equity accounted investments profit after tax

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

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