Restricted Bank Deposits - Summary of Restricted Bank Deposits (Detail) - CNY (¥) ¥ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of restricted bank deposits [Line Items]
Restricted bank deposits, Non-current assets	¥ 8,836	¥ 10,063
Restricted bank deposits, Current assets	2,830	371
Restricted bank deposits, Total	11,666	10,434
Statutory deposit reserves [member]
Disclosure of restricted bank deposits [Line Items]
Restricted bank deposits, Non-current assets	8,728	8,586
Restricted bank deposits, Total	8,728	8,586
Deposited customer reserves [member]
Disclosure of restricted bank deposits [Line Items]
Restricted bank deposits, Non-current assets		1,435
Restricted bank deposits, Current assets	2,332
Restricted bank deposits, Total	2,332	1,435
Pledged bank deposits [member]
Disclosure of restricted bank deposits [Line Items]
Restricted bank deposits, Non-current assets	108	42
Restricted bank deposits, Current assets	498	371
Restricted bank deposits, Total	¥ 606	¥ 413

Disclosure of restricted bank deposits.

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- Definition

The amount of current restricted cash and cash equivalents. [Refer: Restricted cash and cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

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- Definition

The amount of non-current restricted cash and cash equivalents. [Refer: Restricted cash and cash equivalents]

+ References

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- Definition

The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents]

+ References

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