Related Party Transactions - Summary of Gain Or Loss From Transactions With Related Parties (Details) - KRW (₩) ₩ in Millions |
12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Related party transactions [abstract] | |||||||
| Description of other related parties with transactions | Others include Win Mortgage Co., Ltd. and etc., for the years ended December 31, 2023, 2024 and 2025. | Others include Win Mortgage Co., Ltd. and etc., for the years ended December 31, 2023, 2024 and 2025. | Others include Win Mortgage Co., Ltd. and etc., for the years ended December 31, 2023, 2024 and 2025. | ||||
| W Service Networks Co., Ltd. | |||||||
| Related party transactions [abstract] | |||||||
| Other income | ₩ 37 | ₩ 35 | ₩ 0 | ||||
| Fees expenses | 280 | 483 | 552 | ||||
| Other expenses | 1,031 | 1,095 | 1,575 | ||||
| Interest expenses | ₩ 30 | ₩ 37 | ₩ 35 | ||||
| Description of nature of related party relationship | Associates | Associates | Associates | ||||
| Korea Credit Bureau Co., Ltd. | |||||||
| Related party transactions [abstract] | |||||||
| Fees expenses | ₩ 5,228 | ₩ 3,986 | ₩ 4,047 | ||||
| Other expenses | 61 | 155 | 143 | ||||
| Interest expenses | ₩ 10 | ₩ 0 | ₩ 9 | ||||
| Description of nature of related party relationship | Associates | Associates | Associates | ||||
| Korea Finance Security Co., Ltd. | |||||||
| Related party transactions [abstract] | |||||||
| Interest income | ₩ 152 | ₩ 142 | ₩ 181 | ||||
| Provision (Reversal) of allowance for credit loss | (22) | (32) | 26 | ||||
| Other expenses | 25 | 25 | 33 | ||||
| Interest expenses | ₩ 2 | ₩ 3 | ₩ 3 | ||||
| Description of nature of related party relationship | Associates | Associates | Associates | ||||
| LOTTE CARD Co.,Ltd. | |||||||
| Related party transactions [abstract] | |||||||
| Interest income | ₩ 1,525 | ₩ 1,586 | ₩ 10 | ||||
| Fees expenses | 1,382 | 0 | 0 | ||||
| Provision (Reversal) of allowance for credit loss | 15 | 11 | (455) | ||||
| Interest expenses | 2,593 | 4,127 | 5,665 | ||||
| Fees income | 4,103 | 4,019 | 4,164 | ||||
| Gain on derivatives | 248 | 1,075 | 0 | ||||
| Loss on derivatives | ₩ 1,318 | ₩ 457 | ₩ 0 | ||||
| Description of nature of related party relationship | Associates | Associates | Associates | ||||
| K BANK Co., Ltd. | |||||||
| Related party transactions [abstract] | |||||||
| Fees expenses | [1] | ₩ 6 | ₩ 0 | ₩ 339 | |||
| Other expenses | [1] | 2 | 0 | 0 | |||
| Fees income | ₩ 171 | ₩ 269 | ₩ 190 | ||||
| Description of nature of related party relationship | Associates | Associates | Associates | ||||
| Others | |||||||
| Related party transactions [abstract] | |||||||
| Other income | [2] | ₩ 7,457 | ₩ 2,890 | ₩ 4,760 | |||
| Interest income | [2] | 2,233 | 844 | 682 | |||
| Provision (Reversal) of allowance for credit loss | [2] | (264) | 212 | (27) | |||
| Other expenses | [2] | 0 | 1,612 | 836 | |||
| Interest expenses | [2] | 14,017 | 18,045 | 9,333 | |||
| Fees income | [2] | 32,348 | 53,562 | 15,295 | |||
| Dividend income | [2] | ₩ 0 | ₩ 3,729 | ₩ 1,700 | |||
| Description of nature of related party relationship | Associates | Associates | Associates | ||||
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