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Changes in Liabilities Arising from Financing Activities - Summary of Changes in Liabilities Arising from Financial Activities (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning ₩ 6,847,376 ₩ 6,951,971
Cash flows 112,632 (217,061)
Changes in Accounting Policy 807,233  
Newly acquired 256,871 61,187
Exchange difference 6,435 10,277
Fair value change (31,456) 32,390
Scope changes   15,000
Other changes (9,565) (6,388)
Ending 7,989,526 6,847,376
Borrowings [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning 6,648,294 6,683,662
Cash flows 574,175 (139,715)
Exchange difference 64,398 70,095
Scope changes   15,000
Other changes 12,000 19,252
Ending 7,298,867 6,648,294
Financial lease liabilities [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning 163,858 176,878
Cash flows (485,444) (73,885)
Changes in Accounting Policy 807,233  
Newly acquired 256,871 61,187
Other changes (13,379) (322)
Ending 729,139 163,858
Derivative assets [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning (29,843) (7,389)
Cash flows 33,635 11,126
Exchange difference (53,729) (22,474)
Fair value change (11,398) (3,419)
Other changes 2,759 (7,687)
Ending (58,576) (29,843)
Derivative liabilities [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning 65,067 98,820
Cash flows (9,734) (14,587)
Exchange difference (4,234) (37,344)
Fair value change (20,058) 35,809
Other changes (10,945) (17,631)
Ending ₩ 20,096 ₩ 65,067