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Financial Assets At Amortized Cost - Disclosure Of Financial Assets At Amortized Cost (Parenthetical) (Detail) - CNY (¥) ¥ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Detailed Information About Financial assets at amortized costs [Abstract] |  |
financial assets at amortized cost past due | ¥ 1,795 | ¥ 2,077
Impairment loss recognized in the current period | ¥ 300 | ¥ 29

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