Employee Benefit and Related Expenses - Summary of Employee Benefit and Related Expenses (Detail) - CNY (¥) ¥ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Classes of employee benefits expense [abstract]
Salaries, wages, labor service expenses and other benefits	¥ 81,843	¥ 74,427	¥ 69,546
Retirement costs: contributions to defined contribution retirement plans	12,096	11,086	9,917
Employee benefit and related expenses	¥ 93,939	¥ 85,513	¥ 79,463

No definition available.

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- Definition

The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment.

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- Definition

The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

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- Definition

The amount of expense from employee benefits (other than termination benefits) that are expected to be settled wholly within twelve months after the end of the annual reporting period in which the employees render the related services.

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