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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, 2021 | Dec. 31, 2020
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |  |
Beginning balance | [1] | ₩ 358,559 |  |  |
Acquisition |  | 10,929 |  |  |
Disposal |  | (8,221) |  |  |
Valuation |  | 68,777 |  |  |
Others |  | 5,063 |  |  |
Ending Balance |  | 435,107 |  | ₩ 358,559 | [1]
Listed equity securities |  |  |  |  |
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |  |
Beginning balance |  | 194,669 |  | 201,201 |
Acquisition |  | 1,500 |  | 0 |
Disposal |  | (8,208) |  | (4) |
Valuation |  | 81,112 |  | (7,809) |
Others |  | 4,753 |  | 1,281 |
Ending Balance |  | 273,826 |  | 194,669 |
Unlisted equity securities |  |  |  |  |
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |  |
Beginning balance |  | 163,890 | [1] | 177,969 |
Acquisition |  | 8,929 |  | 2,900 |
Disposal |  | (13) |  | (1) |
Valuation |  | (12,335) |  | (23,128) |
Others |  | 319 |  | 6,150 |
Ending Balance | [1] | 160,790 |  | 163,890 |
Corporate Bond |  |  |  |  |
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |  |
Beginning balance |  | 0 |  |  |
Acquisition |  | 500 |  |  |
Disposal |  | 0 |  |  |
Valuation |  | 0 |  |  |
Others |  | (9) |  |  |
Ending Balance |  | 491 |  | 0 |
Listed and unlisted equity securties |  |  |  |  |
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |  |
Beginning balance |  | 358,559 |  | 379,170 |
Acquisition |  | 10,429 |  | 2,900 |
Disposal |  | (8,221) |  | (5) |
Valuation |  | 68,777 |  | (30,937) |
Others |  | 5,072 |  | 7,431 |
Ending Balance |  | 434,616 |  | 358,559 |
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 |  | 358,559 |  | 379,170 |
Acquisition |  | 10,929 |  | 2,900 |
Disposal |  | (8,221) |  | (5) |
Valuation |  | 68,777 |  | (30,937) |
Others |  | 5,063 |  | 7,431 |
Ending Balance |  | ₩ 435,107 |  | ₩ 358,559 |
[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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