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Financial Risk Management - Schedule of Financial Assets and Liabilities Exposed in Foreign Currency Risk (Details) € in Millions, ₫ in Millions, ₩ in Millions, ฿ in Millions, ¥ in Millions, £ in Millions, Rp in Millions, $ in Millions, $ in Millions, $ in Millions | Dec. 31, 2020 KRW (₩) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 JPY (¥) | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 IDR (Rp) | Dec. 31, 2020 THB (฿) | Dec. 31, 2020 TWD ($) | Dec. 31, 2020 VND (₫) | Dec. 31, 2019 KRW (₩) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 JPY (¥) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 IDR (Rp) | Dec. 31, 2019 THB (฿) | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 VND (₫) | Dec. 31, 2019 GBP (£) | Dec. 31, 2019 HKD ($)
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Disclosure Of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets | ₩ | ₩ 40,413 |  |  |  |  |  |  |  | ₩ 15,878 |  |  |  |  |  |  |  |  |
Financial liabilities | ₩ | 19,329 |  |  |  |  |  |  |  | 10,542 |  |  |  |  |  |  |  |  |
USD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets | 31,775 | $ 29,204,905 |  |  |  |  |  |  | 9,403 | $ 8,100,729 |  |  |  |  |  |  |  |
Financial liabilities | 17,099 | $ 15,715,800 |  |  |  |  |  |  | 6,696 | $ 5,775,721 |  |  |  |  |  |  |  |
JPY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets | 4,099 |  | ¥ 388,760,925 |  |  |  |  |  | 4,854 |  | ¥ 456,300,430 |  |  |  |  |  |  |
Financial liabilities | 2,092 |  | ¥ 198,432,867 |  |  |  |  |  | 3,621 |  | ¥ 340,468,613 |  |  |  |  |  |  |
EUR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets | 461 |  |  | € 344,842 |  |  |  |  | 439 |  |  | € 338,598 |  |  |  |  |  |
Financial liabilities | 11 |  |  | € 8,399 |  |  |  |  | 1 |  |  | € 1,000 |  |  |  |  |  |
IDR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets | 1 |  |  |  | Rp 12,955,000 |  |  |  | 1 |  |  |  | Rp 12,955,000 |  |  |  |  |
Financial liabilities | 1 |  |  |  | Rp 15,289,944 |  |  |  | 1 |  |  |  | Rp 17,023,944 |  |  |  |  |
THB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets | 1 |  |  |  |  | ฿ 28,510 |  |  | 1 |  |  |  |  | ฿ 28,510 |  |  |  |
Financial liabilities | ฿ |  |  |  |  |  | ฿ 7,379 |  |  |  |  |  |  |  | ฿ 7,379 |  |  |  |
TWD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets | 4,076 |  |  |  |  |  | $ 105,408,193 |  | 1,125 |  |  |  |  |  | $ 29,236,669 |  |  |
Financial liabilities | ₩ 126 |  |  |  |  |  | $ 3,264,754 |  | 214 |  |  |  |  |  | $ 5,567,672 |  |  |
VND |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets | ₫ |  |  |  |  |  |  |  | ₫ 9,270,000 |  |  |  |  |  |  |  | ₫ 9,270,000 |  |
Financial liabilities | ₫ |  |  |  |  |  |  |  | ₫ 3,243,600 |  |  |  |  |  |  |  | ₫ 3,243,600 |  |
GBP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  | £ 5,625 |
HKD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |  |  | ₩ 55 |  |  |  |  |  |  |  |  | $ 368,048

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