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Financial Risk Management - Summary of Contractual Undiscounted Cash Flows (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Trade and other payables ₩ 8,953,444 ₩ 9,264,193
Borrowings(including debentures) 7,554,564 7,607,931
Other non-derivative financial liabilities 175,633 178,113
Financial guarantee contracts 65,760 26,738
Total 16,749,401 17,076,975
Less than 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Trade and other payables 7,287,436 7,882,861
Borrowings(including debentures) 1,507,232 1,623,996
Other non-derivative financial liabilities 6,123 4,117
Financial guarantee contracts 52,734 26,738
Total 8,853,525 9,537,712
1-5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Trade and other payables 1,173,579 1,219,835
Borrowings(including debentures) 3,669,060 3,666,726
Other non-derivative financial liabilities 37,358 31,290
Financial guarantee contracts 13,026  
Total 4,893,023 4,917,851
More than 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Trade and other payables 492,429 161,497
Borrowings(including debentures) 2,378,272 2,317,209
Other non-derivative financial liabilities 132,152 142,706
Total ₩ 3,002,853 ₩ 2,621,412