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Interests in Unconsolidated Structured Entities - Summary of Unconsolidated Structured Entities and Nature of Risks (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of unconsolidated structured entities [line items]    
Other financial assets ₩ 4,164,961 ₩ 3,823,936
Joint ventures and associates 1,556,889 1,480,722
Real Estate Finance [member]    
Disclosure of unconsolidated structured entities [line items]    
Total assets of unconsolidated structured entities 7,890,823 3,539,827
Other financial assets 216,040 77,819
Joint ventures and associates 144,517 123,138
Total 360,557 200,957
Maximum loss exposure Investment assets 360,557 200,957
Investment agreement and others 44,975 40,914
Total 405,532 241,871
PEF and Investment Funds [member]    
Disclosure of unconsolidated structured entities [line items]    
Total assets of unconsolidated structured entities 4,833,966 5,580,445
Other financial assets 227,266 237,907
Joint ventures and associates 282,550 268,275
Total 509,816 506,182
Maximum loss exposure Investment assets 509,816 506,182
Investment agreement and others 106,064 91,224
Total 615,880 597,406
Asset Securitization [member]    
Disclosure of unconsolidated structured entities [line items]    
Total assets of unconsolidated structured entities 1,846,270 2,044,989
Unconsolidated structured entities [member]    
Disclosure of unconsolidated structured entities [line items]    
Total assets of unconsolidated structured entities 14,571,059 11,165,261
Other financial assets 443,306 315,726
Joint ventures and associates 427,067 391,413
Total 870,373 707,139
Maximum loss exposure Investment assets 870,373 707,139
Investment agreement and others 151,039 132,138
Total ₩ 1,021,412 ₩ 839,277