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Provisions - Summary of Changes in Provisions (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other provisions [line items]    
Beginning balance ₩ 281,876 ₩ 203,030
Increase (Transfer) 66,603 103,946
Usage (56,885) (17,963)
Reversal (37,432) (7,137)
Ending balance 254,162 281,876
Current 175,612 117,881
Non-current 78,550 163,995
Litigation [member]    
Disclosure of other provisions [line items]    
Beginning balance 58,760 18,306
Increase (Transfer) 42,684 44,593
Usage (35,640) (3,002)
Reversal (1,563) (1,137)
Ending balance 64,241 58,760
Current 64,241 14,513
Non-current 0 44,247
Restoration cost [member]    
Disclosure of other provisions [line items]    
Beginning balance 118,828 100,216
Increase (Transfer) 6,591 25,975
Usage (5,394) (3,181)
Reversal (6,736) (4,182)
Ending balance 113,289 118,828
Current 37,906 1,736
Non-current 75,383 117,092
Others [member]    
Disclosure of other provisions [line items]    
Beginning balance 104,288 84,508
Increase (Transfer) 17,328 33,378
Usage (15,851) (11,780)
Reversal (29,133) (1,818)
Ending balance 76,632 104,288
Current 73,465 101,632
Non-current ₩ 3,167 ₩ 2,656