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Interests in Unconsolidated Structured Entities - Summary of Unconsolidated Structured Entities and Nature of Risks (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of unconsolidated structured entities [Line Items]    
Other financial assets ₩ 1,727,623 ₩ 1,385,281
Joint ventures and Associates 279,431 284,075
Real Estate Finance [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Total assets of Unconsolidated Structured Entities 1,426,620 1,075,471
Other financial assets 21,800 21,932
Joint ventures and Associates 10,168 10,086
Total 31,968 32,018
Maximum loss exposure Investment Assets 31,968 32,018
PEF &Investment Fund [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Total assets of Unconsolidated Structured Entities 3,779,377 3,759,246
Other financial assets 52,666 60,782
Joint ventures and Associates 164,030 165,638
Total 216,696 226,420
Maximum loss exposure Investment Assets 216,696 226,420
Asset-backed Securitization [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Total assets of Unconsolidated Structured Entities 2,619,445 2,841,886
Unconsolidated structured entities [Member]    
Disclosure of unconsolidated structured entities [Line Items]    
Total assets of Unconsolidated Structured Entities 7,825,442 7,676,603
Other financial assets 74,466 82,714
Joint ventures and Associates 174,198 175,724
Total 248,664 258,438
Maximum loss exposure Investment Assets ₩ 248,664 ₩ 258,438