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Financial Instruments by Category - Summary of Gains or Losses Arising From Financial Instruments by Category (Parenthetical) (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]      
Interest income recognized as operating revenue ₩ 271,925 ₩ 273,460 ₩ 270,571
Interest expense recognized as operating expense 293,854 263,389 263,579
Profit and loss from foreign currency transaction 67,976 19,976 17,493
BC Card Co., Ltd. [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income recognized as operating revenue 68,869 27,440 20,854
Interest expense recognized as operating expense 27,060 5,458 1,456
Profit and loss from foreign currency transaction 3,569 2,373 19,687
Dividend income 2,299 1,340 2,059
Gain (loss) on valuation 7,860 ₩ 15,459 ₩ 40,822
Gain Loss On Valuation Of derivatives ₩ 418