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Cash Generated from Operations - Summary of Cash Flows from Operating Activities (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash flows from (used in) operating activities [abstract]      
Profit for the year ₩ 1,385,635 ₩ 1,459,395 ₩ 746,256
Adjustments to reconcile net income      
Income tax expense 505,757 519,016 285,349
Interest income (340,794) (300,900) (291,425)
Interest expense 320,914 268,847 265,035
Dividends income (14,121) (21,525) (4,442)
Depreciation 2,687,191 2,643,894 2,635,307
Amortization of intangible assets 627,261 604,744 628,154
Depreciation of right-of-use assets 396,214 398,716 404,174
Provision for severance benefits 240,506 253,491 255,615
Impairment losses on trade receivables 132,102 105,344 139,957
Share of net profit or loss of associates and joint ventures 16,821 (116,061) (18,041)
Loss(gain) on disposal of associates and joint ventures (38,024) 1 111
Loss(gain) on the disposal of subsidiaries (216,591) 13,483 0
Loss(gain) on disposal of right-of-use assets (978) 8,319 2,047
Impairment losses on assets held for sale 0 11 0
Impairment loss on property and equipment and investment in properties 16,094 2,115 0
Loss on disposal of property and equipment and investment in properties (66,317) 17,410 55,590
Loss on disposal of intangible assets 6,393 2,159 246
Loss on impairment of intangible assets 30,674 3,747 211,637
Loss(gain) on foreign currency translation 157,017 180,921 (138,011)
Loss(gain) on valuation and settlement of derivatives, net (205,381) (235,130) 155,600
Loss on disposal of financial assets at fair value through profit or loss (2,347) (29,974) (29,974)
Gain on valuation of financial assets at fair value through profit or loss 44,833 (64,660) (64,660)
Loss(gain) on disposal of financial assets at amortized cost 3 (35) (138)
Others (49,891) 84,625 127,949
Change in operating assets and liabilities, net of effects from purchase of controlled entity and sale of engineering division      
Decrease(increase) in trade receivables (43,787) 327,031 66,462
Decrease(increase) in other receivables (1,598,216) (328,610) 685,209
Decrease(increase) in other current assets (101,947) (89,230) 9,089
Decrease(increase) in other non-current assets (120,054) (143,087) (86,039)
Decrease(increase) in inventories (179,255) 32,798 288,507
Increase(decrease) in trade payables (368,355) 289,044 (135,760)
Decrease in other payables 1,103,113 207,583 (1,232,646)
Increase(decrease) in other current liabilities (30,375) 107,993 127,076
Decrease in other non-current liabilities (1,015) (14,915) (56,319)
Decrease(Increase) in provisions (22,115) (4,668) 2,264
Increase(decrease) in deferred revenue (384) 3,696 (1,948)
Increase in plan assets (90,771) (114,631) (136,336)
Payment of post-employment benefits (343,931) (241,350) (186,520)
Cash generated from operations (1+2+3) ₩ 3,835,879 ₩ 5,829,607 ₩ 4,745,293