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Cash Generated from Operations - Summary of Cash Flows from Operating Activities (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from (used in) operating activities [abstract]      
Profit for the year ₩ 746,256 ₩ 695,868 ₩ 719,412
Adjustments to reconcile net income      
Income tax expense 285,349 320,060 314,565
Interest income (291,425) (303,722) (265,817)
Interest expense 265,035 278,975 296,894
Dividends income (4,442) (3,408) (2,910)
Depreciation 2,635,307 2,567,754 2,735,413
Amortization of intangible assets 628,154 660,705 629,526
Depreciation of right-of-use assets 404,175 442,629  
Provision for severance benefits 255,615 256,525 245,926
Impairment losses on trade receivables 139,957 60,193 113,064
Share of net profit or loss of associates and joint ventures (18,041) 3,252 5,912
Loss(gain) on disposal of associates and joint ventures 111 30 (3,737)
Loss(gain) on disposal of right-of-use assets 2,047 1,556  
Impairment losses on assets held for sale   7,586  
Loss on disposal of property and equipment and investment in properties 55,590 49,284 68,688
Loss(gain) on disposal of intangible assets 246 (1,248) (4,256)
Loss on impairment of intangible assets 211,636 61,899 12,997
Loss(gain) on foreign currency translation (138,011) 75,998 68,952
Loss(gain) on valuation and settlement of derivatives, net 155,600 (70,482) (92,210)
Loss(gain) on disposal of financial assets at fair value through profit or loss 329 (5,115) (1,712)
Gain on valuation of financial assets at fair value through profit or loss (59,044) (4,335) (10,768)
Loss(gain) on disposal of financial assets at amortized cost (138) 43 (44)
Others 127,949 143,500 (55,969)
Changes in operating assets and liabilities      
Decrease(increase) in trade receivables 66,462 (433,292) (81,217)
Decrease(increase) in other receivables 685,209 (79,130) 356,643
Decrease(increase) in other current assets 9,089 984 (123,258)
Decrease(increase) in other non-current assets (86,039) (178,180) 19,556
Decrease(increase) in inventories 288,507 240,488 (480,543)
Increase(decrease) in trade payables (135,760) 44,354 (167,841)
Decrease in other payables (1,232,646) (102,375) (448,301)
Increase in other current liabilities 127,076 43,384 291,548
Increase(decrease) in other non-current liabilities (56,319) (199,547) 144,072
Decrease(Increase) in provisions 2,264 (12,164) 85,946
Decrease(Increase) in deferred revenue (1,948) 641 48,201
Increase in plan assets (136,336) (375,499) (53,301)
Payment of severance benefits (186,520) (119,716) (153,209)
Cash generated from operations (1+2+3) ₩ 4,745,293 ₩ 4,058,065 ₩ 4,212,222