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Derivatives - Effect of derivatives on statement financial position, statement of comprehensive income, statement of changes in equity (Details) ₩ in Millions, Unit_pure in Millions		12 Months Ended
		Dec. 31, 2025 KRW (₩)	Dec. 31, 2024 KRW (₩)	Dec. 31, 2023 KRW (₩)
Fair value hedges | Interest rate forward and swap
Disclosure of detailed information about hedging instruments [line items]
Notional values		10,339,461	10,347,033	10,112,789
Carrying value of assets	[1]	₩ 45,898	₩ 57,685	₩ 65,787
Carrying value of liabilities	[1]	431,007	579,563	614,219
Changes in fair value in the period		₩ 138,277	₩ 42,787	₩ 246,594
Fair value hedges | Currency forward
Disclosure of detailed information about hedging instruments [line items]
Notional values		434,282	429,939	308,117
Carrying value of assets	[1]	₩ 1,079	₩ 0	₩ 2,949
Carrying value of liabilities	[1]	14,708	39,395	791
Changes in fair value in the period		₩ 14,686	₩ (46,382)	₩ (327)
Fair value hedges | Equity options
Disclosure of detailed information about hedging instruments [line items]
Notional values		0	18,750
Carrying value of assets	[1]	₩ 0
Carrying value of liabilities	[1]	0	₩ 3,941
Changes in fair value in the period		₩ 3,941	₩ 1,109
Cash flow hedges | Currency swap
Disclosure of detailed information about hedging instruments [line items]
Notional values		9,059,478	7,993,851	4,448,030
Carrying value of assets	[1]	₩ 521,120	₩ 539,015	₩ 111,024
Carrying value of liabilities	[1]	344,888	181,413	99,093
Changes in fair value in the period		₩ (218,169)	₩ 314,114	₩ (21,649)
Cash flow hedges | Interest rate forward and swap
Disclosure of detailed information about hedging instruments [line items]
Notional values		3,273,296	2,872,383	2,356,791
Carrying value of assets	[1]	₩ 31,076	₩ 93,562	₩ 53,830
Carrying value of liabilities	[1]	196,244	44,139	90,676
Changes in fair value in the period		₩ (214,598)	₩ 60,694	₩ 99,442
Cash flow hedges | Currency forward
Disclosure of detailed information about hedging instruments [line items]
Notional values		1,898,541	1,723,440	1,150,734
Carrying value of assets	[1]	₩ 1,104	₩ 2,087	₩ 12,593
Carrying value of liabilities	[1]	161,596	138,694	30,925
Changes in fair value in the period		₩ 34,038	₩ (104,727)	₩ 2,170
Hedge of Net Investment | Currency forward
Disclosure of detailed information about hedging instruments [line items]
Notional values		1,380,935	2,191,770	683,382
Carrying value of assets	[1]	₩ 16,814	₩ 10,013	₩ 6,038
Carrying value of liabilities	[1]	0	34,926	2,776
Changes in fair value in the period		₩ 51,154	₩ (41,071)	₩ 4,537
Hedge of Net Investment | Borrowings
Disclosure of detailed information about hedging instruments [line items]
Notional values		1,895,100	1,852,212	1,466,795
Carrying value of assets	[1]	₩ 0	₩ 0	₩ 0
Carrying value of liabilities	[1]	1,891,783	1,848,316	1,462,329
Changes in fair value in the period		₩ 29,364	₩ (181,341)	₩ (4,767)
[1] The related account categories are presented as interest rate swap assets / liabilities and currency forward assets / liabilities etc.

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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No definition available.

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- Definition

The gain (loss) on the change in fair value of the hedging instrument used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The nominal amount of a hedging instrument. [Refer: Hedging instruments [domain]]

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