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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
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