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Business Combination - Summary of Operating Income And Net Profit And Loss Before Elimination Of Intercompany Transactions Of The Acquired Companies (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of Business Combination Operating Income And Net Profit Loss Before Elimination Of Inter Company Transaction Detailed Information Explanatory [Line Items] |  |  |
Operating revenue | ₩ 25,638,855 | ₩ 24,898,005 | ₩ 24,099,394
Profit (loss) for the year | 1,385,635 | ₩ 1,459,395 | ₩ 746,256
SPARK AND ASSOCIATES INC. [Member] |  |  |
Disclosure of Business Combination Operating Income And Net Profit Loss Before Elimination Of Inter Company Transaction Detailed Information Explanatory [Line Items] |  |  |
Operating revenue | 6,856 |  |
Profit (loss) for the year | 670 |  |
SPARK AND ASSOCIATES INC. [Member] | After Business Combination [Member] |  |  |
Disclosure of Business Combination Operating Income And Net Profit Loss Before Elimination Of Inter Company Transaction Detailed Information Explanatory [Line Items] |  |  |
Operating revenue | 1,637 |  |
Profit (loss) for the year | ₩ 413 |  |

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