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Financial Assets at Fair Value Through Other Comprehensive Income - Summary of Changes in Financial Assets at Fair Value Through Other Comprehensive Income (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |
Beginning balance |  | ₩ 502,443 |  | ₩ 502,829
Acquisition |  | 4,000 |  | 14,060
Disposal |  | (170) |  | (5,332)
Valuation |  | 162,565 |  | (9,970)
Others |  | 6,012 |  | 856
Ending Balance |  | 674,850 |  | 502,443
Listed equity securities |  |  |  |
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |
Beginning balance |  | 285,054 |  | 300,057
Acquisition |  | 0 |  | 430
Disposal |  | (170) |  | 0
Valuation |  | 73,891 |  | (15,433)
Others |  | 1,321 |  | 0
Ending Balance |  | 360,096 |  | 285,054
Unlisted equity securities |  |  |  |
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |
Beginning balance |  | 212,762 | [1] | 202,243
Acquisition |  | 4,000 |  | 9,550
Disposal |  | 0 |  | (5,332)
Valuation |  | 88,256 |  | 5,445
Others |  | 4,691 |  | 856
Ending Balance | [1] | 309,709 |  | 212,762
Corporate bond |  |  |  |
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |
Beginning balance |  | 4,627 |  | 529
Acquisition |  | 0 |  | 4,080
Disposal |  | 0 |  | 0
Valuation |  | 418 |  | 18
Others |  | 0 |  | 0
Ending Balance |  | 5,045 |  | 4,627
Listed and unlisted equity securties |  |  |  |
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |
Beginning balance |  | 497,816 |  | 502,300
Acquisition |  | 4,000 |  | 9,980
Disposal |  | (170) |  | (5,332)
Valuation |  | 162,147 |  | (9,988)
Others |  | 6,012 |  | 856
Ending Balance |  | 669,805 |  | 497,816
Current Financial assets at fair value through other comprehensive income category |  |  |  |
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |
Beginning balance |  | 0 |  | 0
Acquisition |  | 0 |  | 0
Disposal |  | 0 |  | 0
Valuation |  | 0 |  | 0
Others |  | 0 |  | 0
Ending Balance |  | 0 |  | 0
Non-Current Financial assets at fair value through other comprehensive income category |  |  |  |
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |
Beginning balance |  | 502,443 |  | 502,829
Acquisition |  | 4,000 |  | 14,060
Disposal |  | (170) |  | (5,332)
Valuation |  | 162,565 |  | (9,970)
Others |  | 6,012 |  | 856
Ending Balance |  | ₩ 674,850 |  | ₩ 502,443
[1] | The Company used initial cost as their fair value because there was not enough information to determine fair value, and the range of the estimated fair value is wide.

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