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Financial Risk Management - Summary of Contractual Undiscounted Cash Flows (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | ₩ 7,576,809 | ₩ 9,324,730
Borrowings(including debentures) | 8,205,838 | 8,216,212
Lease liabilities | 1,143,640 | 1,211,352
Other non-derivative financial liabilities | 131,816 | 196,475
Financial guarantee contracts | 22,422 | 19,422
Total | 17,122,317 | 19,064,221
Less than 1 year [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | 6,587,796 | 8,149,445
Borrowings(including debentures) | 1,573,944 | 1,304,936
Lease liabilities | 336,024 | 397,609
Other non-derivative financial liabilities | 574 | 1,749
Financial guarantee contracts | 22,422 | 19,422
Total | 8,520,760 | 9,873,161
1-5 years [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | 730,758 | 805,241
Borrowings(including debentures) | 4,373,534 | 4,417,639
Lease liabilities | 658,501 | 688,518
Other non-derivative financial liabilities | 131,242 | 175,764
Financial guarantee contracts |  |
Total | 5,894,035 | 6,087,162
More than 5 years [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | 258,255 | 370,044
Borrowings(including debentures) | 2,258,360 | 2,493,637
Lease liabilities | 190,907 | 221,255
Other non-derivative financial liabilities |  | 18,962
Financial guarantee contracts |  |
Total | ₩ 2,707,522 | ₩ 3,103,898

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