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Operating Expenses - Summary of Details of Employee Benefits (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Profit or loss [abstract]
Short-term employee benefits	₩ 3,297,944	₩ 3,206,904	₩ 3,055,699
Post-employment benefits (Defined benefit plan)	209,770	208,942	202,814
Post-employment benefits (Defined contribution plan)	45,936	46,023	35,699
Post-employment benefits (Others)	6,949	8,017	5,535
Share-based payment	7,660	7,710	3,737
Total	₩ 3,568,259	₩ 3,477,596	₩ 3,303,484

X

- 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 benefit plans. [Refer: Defined benefit plans [member]]

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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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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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Other post-employment benefits expenses such as additional retirement bonus.

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- Definition

Post employment benefit expense share based payment.

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