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Income Tax Expense - Summary of Differences Between Tax Expense and Amount Arise Using Statutory Tax Rate Applicable to Profits of Entities (Details) ₩ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2021 KRW (₩) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 KRW (₩) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 KRW (₩) | Dec. 31, 2019 USD ($)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |  |  |  |
Profit before income tax | ₩ 99,301 |  | ₩ 88,011 |  | ₩ 51,256 |
Income tax using the statutory tax rate of each country | 25,957 |  | 19,828 |  | 12,063 |
Adjustments |  |  |  |  |  |
Expenses not deductible for tax purpose | 11 |  | 20 |  | 42 |
Foreign tax credits | 4,500 |  | 3,223 |  | 4,854 |
Changes in estimates related to prior period | 0 |  | 11 |  | (4,347) |
Utilization of previously unrecognized deferred tax asset | 0 |  | (412) |  | 0 |
Change in deferred tax due to carry-forward deficits | 0 |  | 0 |  | (33) |
Adjustments recognized related to prior period incomes | 1,647 |  | 0 |  | 0 |
Effect of change of foreign currency exchange rate | (2) |  | (19) |  | (12) |
Tax credit | (765) |  | (1,022) |  | (543) |
Additional tax for insufficient investments in designated areas | $ |  | $ 487 |  | $ 668 |  | $ 0
Changes in deferred tax liabilities related to investment in subsidiaries | 1,351 |  | 2,577 |  | 0 |
Others | 235 |  | 581 |  | (498) |
Total adjustments | 7,464 |  | 5,627 |  | (537) |
Income tax expense | ₩ 33,421 |  | ₩ 25,455 |  | ₩ 11,526 |
Effective tax rate | 34.00% | 34.00% | 29.00% | 29.00% | 22.00% | 22.00%

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