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Goodwill - Additional Information (Detail) - Growth Rate [Member] - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of information for cash-generating units [line items]      
Growth rate used to extrapolate cash flow projections   3.00%  
Impairment loss recognised in profit or loss, goodwill ¥ 129 ¥ 0 ¥ 68