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Interests in unconsolidated structured entities - Summary of carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	₩ 52,600,920	₩ 50,395,946
Carrying amounts of the liabilities	8,897	8,158
Derivative liabilities
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the liabilities	2,101	3,350
Other liabilities
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the liabilities	6,796	4,808
Loans at FVTPL
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	750,660	612,465
Loans at amortized cost
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	22,532,620	21,079,692
Securities at FVTPL
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	21,242,866	19,391,428
Derivative assets
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	9,286	16,012
Securities at FVOCI
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	3,859,649	4,301,015
Securities at amortized cost
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	4,089,677	4,879,577
Other assets
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	116,162	115,757
Asset-backed securitization
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	15,300,459	15,604,968
Carrying amounts of the liabilities	2,416	3,640
Asset-backed securitization | Derivative liabilities
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the liabilities	2,101	3,130
Asset-backed securitization | Other liabilities
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the liabilities	315	510
Asset-backed securitization | Loans at FVTPL
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	4,622	11,669
Asset-backed securitization | Loans at amortized cost
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	2,971,101	2,326,196
Asset-backed securitization | Securities at FVTPL
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	4,491,692	4,233,165
Asset-backed securitization | Derivative assets
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	9,286	16,012
Asset-backed securitization | Securities at FVOCI
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	3,721,496	4,124,742
Asset-backed securitization | Securities at amortized cost
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	4,089,597	4,879,484
Asset-backed securitization | Other assets
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	12,665	13,700
Structured financing
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	20,718,392	19,767,186
Carrying amounts of the liabilities	6,481	4,515
Structured financing | Derivative liabilities
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the liabilities	0	220
Structured financing | Other liabilities
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the liabilities	6,481	4,295
Structured financing | Loans at FVTPL
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	746,038	600,796
Structured financing | Loans at amortized cost
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	19,410,662	18,660,200
Structured financing | Securities at FVTPL
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	322,481	255,936
Structured financing | Derivative assets
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	0	0
Structured financing | Securities at FVOCI
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	138,153	176,273
Structured financing | Securities at amortized cost
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	0	0
Structured financing | Other assets
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	101,058	73,981
Investment funds
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	16,582,069	15,023,792
Carrying amounts of the liabilities	0	3
Investment funds | Derivative liabilities
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the liabilities	0	0
Investment funds | Other liabilities
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the liabilities	0	3
Investment funds | Loans at FVTPL
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	0	0
Investment funds | Loans at amortized cost
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	150,857	93,296
Investment funds | Securities at FVTPL
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	16,428,693	14,902,327
Investment funds | Derivative assets
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	0	0
Investment funds | Securities at FVOCI
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	0	0
Investment funds | Securities at amortized cost
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	80	93
Investment funds | Other assets
Carrying amounts of the assets and liabilities relating to its interests in unconsolidated structured entities [Line Items]
Carrying amounts of the assets	₩ 2,439	₩ 28,076

X

- Definition

The amount of assets recognised in the entity's financial statements relating to its interests in structured entities. [Refer: Assets; Total for all unconsolidated structured entities [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

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