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Cash Generated from Operations - Summary of Cash Flows from Operating Activities (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flows from (used in) operating activities [abstract]      
Profit for the year ₩ 972,182 ₩ 1,385,635 ₩ 1,459,395
Adjustments to reconcile net income      
Income tax expense 335,367 505,757 519,016
Interest income (392,580) (340,794) (300,900)
Interest expense 410,566 320,914 268,847
Dividends income (59,758) (14,121) (21,525)
Depreciation 2,773,152 2,687,191 2,643,894
Amortization of intangible assets 691,909 627,261 604,744
Depreciation of right-of-use assets 402,737 396,214 398,716
Provision for severance benefits (defined benefits) 196,027 240,506 253,491
Impairment losses on trade receivables 175,244 132,102 105,344
Share of net profit or loss of associates and joint ventures 44,323 16,821 (116,061)
Loss(gain) on disposal of associates and joint ventures (6,982) (38,024) 1
Loss(gain) on the disposal of subsidiaries (28,825) (216,591) 13,483
Loss(gain) on disposal of right-of-use assets (1,465) (978) 8,319
Impairment losses on assets held for sale 0 0 11
Impairment loss on property and equipment and investment in properties 7,871 16,094 2,115
Loss(gain) on disposal of property and equipment and investment in properties 511 (66,317) 17,410
Loss on disposal of intangible assets 3,601 6,393 2,159
Loss on impairment of intangible assets 236,106 30,674 3,747
Loss on foreign currency translation 83,899 157,017 180,921
Gain on valuation and settlement of derivatives, net (37,249) (205,381) (235,130)
Gain on disposal of financial assets at fair value through profit or loss (2,225) (2,347) (29,974)
Loss(Gain) on valuation of financial assets at fair value through profit or loss 13,920 44,833 (64,660)
Loss(gain) on disposal of financial assets at amortized cost 1 3 (35)
Others 158,820 (49,891) 84,625
Change in operating assets and liabilities, net of effects from purchase of controlled entity and sale of engineering division      
Decrease(increase) in trade receivables (124,023) (43,787) 327,031
Increase in other receivables (1,085,527) (1,598,216) (328,610)
Decrease(increase) in other current assets 250,569 (101,947) (89,230)
Increase in other non-current assets (86,030) (120,054) (143,087)
Decrease(increase) in inventories (317,531) (179,255) 32,798
Increase(decrease) in trade payables 121,515 (368,355) 289,044
Increase in other payables 829,220 1,103,113 207,583
Increase(decrease) in other current liabilities 414,436 (30,375) 107,993
Decrease in other non-current liabilities (14,272) (1,015) (14,915)
Decrease in provisions (5,083) (22,115) (4,668)
Increase(decrease) in deferred revenue 905 (384) 3,696
Decrease(increase) in plan assets 115,725 (90,771) (114,631)
Payment of post-employment benefits (329,861) (343,931) (241,350)
Cash generated from operations (1+2+3) ₩ 5,747,195 ₩ 3,835,879 ₩ 5,829,607