Schedule of Unrealized and Realized Gains and Losses of Equity Securities Without Readily Determinable Fair Values (Parenthetical) (Detail) - CNY (¥) ¥ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Equity Securities, FV-NI and without Readily Determinable Fair Value [Abstract]
Equity securities gross unrealized loss excluding impairment	¥ 0	¥ 8	¥ 0

Equity securities gross unrealised loss excluding impairment.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration