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Financial Risk Management - Summary of Cash Outflow and Inflow of Derivatives Settled Gross or Net are Undiscounted Contractual Cash Flow (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for derivative financial liabilities [Line Items]      
Outflow ₩ 2,439,559 ₩ 1,711,595 ₩ 2,886,867
Inflow 2,496,356 1,686,804 3,196,870
Less than 1 year [member]      
Disclosure of maturity analysis for derivative financial liabilities [Line Items]      
Outflow 455,343 638,171 1,174,147
Inflow 484,505 608,270 1,302,112
1-5 years [member]      
Disclosure of maturity analysis for derivative financial liabilities [Line Items]      
Outflow 1,466,915 546,791 1,176,715
Inflow 1,492,718 568,976 1,306,199
More than 5 years [member]      
Disclosure of maturity analysis for derivative financial liabilities [Line Items]      
Outflow 517,301 526,633 536,005
Inflow ₩ 519,133 ₩ 509,558 ₩ 588,559