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Property and Equipment - Summary of Changes in Property and Equipment (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net ₩ 14,772,179 ₩ 14,464,886  
Acquisition and capital expenditure 3,189,108 3,346,380  
Disposal and termination (81,119) (92,123)  
Depreciation (2,720,283) (2,640,187)  
Impairment (7,872) (16,156)  
Transfer in (out) (159,872) (62,802)  
Transfer from (to) investment properties (126,250) (206,183)  
Acquisition and disposition of businesses 5,564 (8,587) ₩ (5,128)
Others 624 (13,049)  
Ending, net 14,872,079 14,772,179 14,464,886
Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net 50,580,188 48,995,516  
Ending, net 52,056,203 50,580,188 48,995,516
Accumulated depreciation, amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net (35,808,009) (34,530,630)  
Ending, net (37,184,124) (35,808,009) (34,530,630)
Land [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net 1,272,808 1,315,797  
Acquisition and capital expenditure 844 11,392  
Disposal and termination (3,651) (2,556)  
Transfer in (out) 58,790 24,647  
Transfer from (to) investment properties (37,725) (63,278)  
Acquisition and disposition of businesses 18,761 0  
Others 14,549 (13,194)  
Ending, net 1,324,376 1,272,808 1,315,797
Land [member] | Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net 1,272,940 1,315,929  
Ending, net 1,324,508 1,272,940 1,315,929
Land [member] | Accumulated depreciation, amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net (132) (132)  
Ending, net (132) (132) (132)
Buildings and structures [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net 2,554,561 2,517,422  
Acquisition and capital expenditure 5,072 32,030  
Disposal and termination (5,012) (4,338)  
Depreciation (148,981) (147,620)  
Impairment 0 0  
Transfer in (out) 151,157 230,955  
Transfer from (to) investment properties (88,336) (140,229)  
Acquisition and disposition of businesses 49,532 0  
Others 137 66,341  
Ending, net 2,518,130 2,554,561 2,517,422
Buildings and structures [member] | Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net 4,830,853 4,707,250  
Ending, net 4,903,073 4,830,853 4,707,250
Buildings and structures [member] | Accumulated depreciation, amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net (2,276,292) (2,189,828)  
Ending, net (2,384,943) (2,276,292) (2,189,828)
Machinery and equipment1 [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net 9,613,829 9,316,571  
Acquisition and capital expenditure 75,412 129,754  
Disposal and termination (70,418) (76,608)  
Depreciation (2,495,402) (2,413,191)  
Impairment (6,577) (6,084)  
Transfer in (out) 2,706,444 2,660,753  
Acquisition and disposition of businesses (14,981) (4,386)  
Others (1,628) 7,020  
Ending, net 9,806,679 9,613,829 9,316,571
Machinery and equipment1 [member] | Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net 42,091,573 40,270,005  
Ending, net 43,611,280 42,091,573 40,270,005
Machinery and equipment1 [member] | Accumulated depreciation, amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net (32,477,744) (30,953,434)  
Ending, net (33,804,601) (32,477,744) (30,953,434)
Others [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net 223,436 221,238  
Acquisition and capital expenditure 78,400 67,921  
Disposal and termination (1,711) (4,695)  
Depreciation (75,900) (79,376)  
Impairment (1) (7,825)  
Transfer in (out) 16,407 31,036  
Acquisition and disposition of businesses (44,543) (481)  
Others (7,742) (4,382)  
Ending, net 188,346 223,436 221,238
Others [member] | Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net 1,276,779 1,607,853  
Ending, net 1,182,144 1,276,779 1,607,853
Others [member] | Accumulated depreciation, amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net (1,053,343) (1,386,615)  
Ending, net (993,798) (1,053,343) (1,386,615)
Construction-in-progress [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net 1,107,545 1,093,858  
Acquisition and capital expenditure 3,029,380 3,105,283  
Disposal and termination (327) (3,926)  
Impairment (1,294) (2,247)  
Transfer in (out) (3,092,670) (3,010,193)  
Transfer from (to) investment properties (189) (2,676)  
Acquisition and disposition of businesses (3,205) (3,720)  
Others (4,692) (68,834)  
Ending, net 1,034,548 1,107,545 1,093,858
Construction-in-progress [member] | Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net 1,108,043 1,094,479  
Ending, net 1,035,198 1,108,043 1,094,479
Construction-in-progress [member] | Accumulated depreciation, amortisation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning, net (498) (621)  
Ending, net ₩ (650) ₩ (498) ₩ (621)