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Financial Risk Management - Summary of Cash Outflow and Inflow of Derivatives Settled Gross or Net are Undiscounted Contractual Cash Flow (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Derivatives held for trading |  |  |
Outflows | ₩ 131,630 | ₩ 133,293 | ₩ 102,924
Inflow |  | 1,015 |
Derivatives settled gross |  |  |
Outflow | 2,923,663 | 1,976,432 | 2,994,649
Inflow | 3,489,782 | 2,849,368 | 3,258,353
Less than 1 year [member] |  |  |
Derivatives held for trading |  |  |
Outflows | 0 | 0 | 0
Derivatives settled gross |  |  |
Outflow | 1,326,759 | 741,140 | 472,005
Inflow | 1,550,061 | 614,066 | 550,478
1-5 years [member] |  |  |
Derivatives held for trading |  |  |
Outflows | 131,630 | 133,293 | 101,994
Derivatives settled gross |  |  |
Outflow | 1,570,621 | 1,227,166 | 2,493,858
Inflow | 1,900,720 | 2,198,958 | 2,670,002
More than 5 years [member] |  |  |
Derivatives held for trading |  |  |
Outflows | 0 | 0 | 930
Inflow |  | 1,015 |
Derivatives settled gross |  |  |
Outflow | 26,283 | 8,126 | 28,786
Inflow | ₩ 39,001 | ₩ 36,344 | ₩ 37,873

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