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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Derivatives held for trading |  |  |
Outflows | ₩ 133,293 | ₩ 102,924 | ₩ 158,284
Inflow | 1,015 |  |
Derivatives settled gross |  |  |
Outflow | 1,976,432 | 2,994,649 | 3,078,733
Inflow | 2,849,368 | 3,258,353 | 3,167,878
Less than 1 year [member] |  |  |
Derivatives held for trading |  |  |
Outflows | 0 | 0 | 0
Inflow | 0 |  |
Derivatives settled gross |  |  |
Outflow | 741,140 | 472,005 | 843,489
Inflow | 614,066 | 550,478 | 856,508
1-5 years [member] |  |  |
Derivatives held for trading |  |  |
Outflows | 133,293 | 101,994 | 158,284
Inflow | 0 |  |
Derivatives settled gross |  |  |
Outflow | 1,227,166 | 2,493,858 | 1,857,942
Inflow | 2,198,958 | 2,670,002 | 1,917,236
More than 5 years [member] |  |  |
Derivatives held for trading |  |  |
Outflows | 0 | 930 | 0
Inflow | 1,015 |  |
Derivatives settled gross |  |  |
Outflow | 8,126 | 28,786 | 377,302
Inflow | ₩ 36,344 | ₩ 37,873 | ₩ 394,134

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