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Cash Generated from Operations - Summary of Cash Flows from Operating Activities (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from (used in) operating activities [abstract]      
Profit for the year ₩ 699,274 ₩ 719,412 ₩ 546,341
Adjustments to reconcile net income      
Income tax expense 320,060 314,565 270,656
Interest income (303,722) (265,817) (108,639)
Interest expense 268,773 296,894 302,464
Dividends income (3,408) (2,910) (4,785)
Depreciation 2,567,754 2,735,413 2,802,531
Amortization of intangible assets 660,705 629,526 635,150
Depreciation of right-of-use assets 452,056    
Provision for severance benefits 256,525 245,926 218,966
Impairment losses on trade receivables 60,193 113,064 45,704
Share of net profit or loss of associates and joint ventures 3,252 5,912 15,480
Loss(gain) on disposal of associates and joint ventures 30 (3,737) 979
Gain on disposal of right-of-use assets (1,853)    
Impairment loss of associates and joint ventures 0   3,662
Impairment losses on assets held for sale 7,586    
Loss on disposal of property and equipment and investment in properties 49,284 68,688 150,293
Loss(gain) on disposal of intangible assets (1,248) (4,256) 4,271
Loss on impairment of intangible assets 61,899 12,997 116,095
Loss on foreign currency translation 75,998 68,952 (213,341)
Loss(gain) on valuation and settlement of derivatives, net (70,482) (92,210) 268,094
Gain on disposal of financial assets at fair value through profit or loss (5,115) (1,712)  
Gain on valuation of financial assets at fair value through profit or loss (4,335) (10,768)  
Gain on disposal of financial assets at amortized cost 43 (44)  
Impairment losses on available-for-sale financial assets 0   9
Gain on disposal of available-for-sale financial assets 0   (89,598)
Others 134,848 (55,969) (251,193)
Changes in operating assets and liabilities      
Decrease(increase) in trade receivables (433,292) (81,217) (303,340)
Decrease(increase) in other receivables (79,130) 356,643 (346,013)
Decrease(increase) in other current assets 984 (123,258) 11,792
Decrease(increase) in other non-current assets (178,180) 19,556 (43,790)
Decrease(increase) in inventories 240,488 (480,543) (205,403)
Increase(decrease) in trade payables 44,354 (167,841) 162,110
Increase(decrease) in other payables (102,375) (448,301) 214,689
Increase in other current liabilities 43,384 291,548 288,553
Increase(decrease) in other non-current liabilities (199,547) 144,072 174,618
Decrease(Increase) in provisions (12,164) 85,946 (12,574)
Decrease(Increase) in deferred revenue 641 48,201 (13,086)
Increase in plan assets (375,499) (53,301) (203,420)
Payment of severance benefits (119,716) (153,209) (118,391)
Cash generated from operations (1+2+3) ₩ 4,058,065 ₩ 4,212,222 ₩ 4,318,884