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Financial Risk Management - Summary of Contractual Undiscounted Cash Flows (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | ₩ 8,090,898 | ₩ 7,576,809
Borrowings(including debentures) | 9,838,571 | 8,205,838
Lease liabilities | 1,300,562 | 1,185,432
Other non-derivative financial liabilities | 309,122 | 131,816
Financial guarantee contracts | 71,697 | 22,422
Total | 19,610,850 | 17,122,317
Less than 1 year [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | 6,698,783 | 6,587,796
Borrowings(including debentures) | 1,927,456 | 1,573,944
Lease liabilities | 388,226 | 336,024
Other non-derivative financial liabilities | 1,473 | 574
Financial guarantee contracts | 71,697 | 22,422
Total | 9,087,635 | 8,520,760
1-5 years [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | 1,232,468 | 730,758
Borrowings(including debentures) | 5,635,558 | 4,373,534
Lease liabilities | 484,476 | 658,501
Other non-derivative financial liabilities | 206,749 | 131,242
Financial guarantee contracts |  |
Total | 7,559,251 | 5,894,035
More than 5 years [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | 159,647 | 258,255
Borrowings(including debentures) | 2,275,557 | 2,258,360
Lease liabilities | 427,860 | 190,907
Other non-derivative financial liabilities | 100,900 |
Financial guarantee contracts |  |
Total | ₩ 2,963,964 | ₩ 2,707,522

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