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Property and Equipment - Summary of Changes in Property and Equipment (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net ₩ 13,785,299 ₩ 13,068,257
Changes in accounting policy   (210,028)
Acquisition and capital expenditure 3,151,849 3,693,428
Disposal and termination (78,936) (87,493)
Depreciation (2,570,775) (2,502,576)
Impairment (79,775) (43,260)
Transfer in (out) (44,860) (61,109)
Transfer to investment properties (2,056) (41,335)
Transfer assets held-for-sale   (90,451)
Changes in scope of consolidation 818  
Others 44,555 59,866
Ending, net 14,206,119 13,785,299
Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 45,655,456 44,289,629
Ending, net 47,586,332 45,655,456
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net (31,870,157) (31,221,372)
Ending, net (33,380,213) (31,870,157)
Land [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 1,262,181 1,281,187
Acquisition and capital expenditure 25,156 338
Disposal and termination (1,756) (1,352)
Transfer in (out) 53,238 126,066
Transfer to investment properties 6,792 (33,254)
Transfer assets held-for-sale   (89,330)
Changes in scope of consolidation 56  
Others (11,040) (21,474)
Ending, net 1,334,627 1,262,181
Land [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 1,262,313 1,281,319
Ending, net 1,334,759 1,262,313
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)
Buildings and structures [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 2,162,064 2,007,685
Changes in accounting policy   (149)
Acquisition and capital expenditure 7,249 4,523
Disposal and termination (3,367) (4,213)
Depreciation (135,646) (134,350)
Impairment (36) (32)
Transfer in (out) 283,937 270,980
Transfer to investment properties (8,848) (8,081)
Transfer assets held-for-sale   (1,121)
Changes in scope of consolidation 494  
Others 2,175 26,822
Ending, net 2,308,022 2,162,064
Buildings and structures [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 4,125,229 3,873,074
Ending, net 4,402,691 4,125,229
Buildings and structures [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net (1,963,165) (1,865,389)
Ending, net (2,094,669) (1,963,165)
Machinery and equipment1 [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 9,093,251 8,475,016
Changes in accounting policy   (12,947)
Acquisition and capital expenditure 112,085 205,359
Disposal and termination (69,401) (76,457)
Depreciation (2,343,965) (2,278,286)
Impairment (35,271) (41,450)
Transfer in (out) 2,489,138 2,742,671
Changes in scope of consolidation 225  
Others 68,921 79,345
Ending, net 9,314,983 9,093,251
Machinery and equipment1 [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 37,654,635 36,327,007
Ending, net 39,182,265 37,654,635
Machinery and equipment1 [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net (28,561,384) (27,851,991)
Ending, net (29,867,282) (28,561,384)
Others [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 267,535 478,381
Changes in accounting policy   (196,932)
Acquisition and capital expenditure 47,669 64,072
Disposal and termination (3,385) (4,109)
Depreciation (91,164) (89,940)
Impairment (44,468) (1,751)
Transfer in (out) 28,024 16,218
Transfer to investment properties   0
Changes in scope of consolidation 43  
Others 1,398 1,596
Ending, net 205,652 267,535
Others [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 1,612,108 1,981,646
Ending, net 1,619,822 1,612,108
Others [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net (1,344,573) (1,503,265)
Ending, net (1,414,170) (1,344,573)
Construction-in-progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 1,000,268 825,988
Acquisition and capital expenditure 2,959,690 3,419,136
Disposal and termination (1,027) (1,362)
Impairment 0 (27)
Transfer in (out) (2,899,197) (3,217,044)
Others (16,899) (26,423)
Ending, net 1,042,835 1,000,268
Construction-in-progress [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 1,001,171 826,583
Ending, net 1,046,795 1,001,171
Construction-in-progress [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net (903) (595)
Ending, net ₩ (3,960) ₩ (903)