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Property and Equipment - Summary of Changes in Property and Equipment (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net ₩ 13,068,257 ₩ 13,562,319
Changes in accounting policy (210,028)  
Acquisition and capital expenditure 3,693,428 2,287,630
Disposal and termination (87,493) (124,542)
Depreciation (2,502,576) (2,690,760)
Impairment (43,260) (15,893)
Transfer in (out) (61,109) 1,024
Inclusion in scope of consolidation   6,798
Transfer to investment properties (41,335) 39,363
Transfer assets held-for-sale (90,451)  
Others 59,866 2,318
Ending, net 13,785,299 13,068,257
Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 44,289,629 43,626,804
Ending, net 45,655,456 44,289,629
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net (31,221,372) (30,064,485)
Ending, net (31,870,157) (31,221,372)
Land [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 1,281,187 1,268,657
Acquisition and capital expenditure 338 9,897
Disposal and termination (1,352) (3,718)
Transfer in (out) 126,066 7,663
Transfer to investment properties (33,254) (3,080)
Transfer assets held-for-sale (89,330)  
Others (21,474) 1,768
Ending, net 1,262,181 1,281,187
Land [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 1,281,319 1,268,789
Ending, net 1,262,313 1,281,319
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 [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 2,007,685 2,012,422
Changes in accounting policy (149)  
Acquisition and capital expenditure 4,523 1,728
Disposal and termination (4,213) (2,640)
Depreciation (134,350) (132,353)
Impairment (32) (5,551)
Transfer in (out) 270,980 127,052
Inclusion in scope of consolidation   44
Transfer to investment properties (8,081) 5,366
Transfer assets held-for-sale (1,121)  
Others 26,822 1,617
Ending, net 2,162,064 2,007,685
Buildings [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 3,873,074 3,750,861
Ending, net 4,125,229 3,873,074
Buildings [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net (1,865,389) (1,738,439)
Ending, net (1,963,165) (1,865,389)
Machinery and equipment1 [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 8,475,016 9,060,809
Changes in accounting policy (12,947)  
Acquisition and capital expenditure 205,359 137,088
Disposal and termination (76,457) (113,266)
Depreciation (2,278,286) (2,398,782)
Impairment (41,450) (1,237)
Transfer in (out) 2,742,671 1,767,878
Inclusion in scope of consolidation   4,228
Others 79,345 18,298
Ending, net 9,093,251 8,475,016
Machinery and equipment1 [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 36,327,007 35,971,877
Ending, net 37,654,635 36,327,007
Machinery and equipment1 [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net (27,851,991) (26,911,068)
Ending, net (28,561,384) (27,851,991)
Others [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 478,381 506,838
Changes in accounting policy (196,932)  
Acquisition and capital expenditure 64,072 101,832
Disposal and termination (4,109) (4,336)
Depreciation (89,940) (159,625)
Impairment (1,751) (8,935)
Transfer in (out) 16,218 9,525
Inclusion in scope of consolidation   2,526
Transfer to investment properties   37,077
Others 1,596 (6,521)
Ending, net 267,535 478,381
Others [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 1,981,646 1,920,571
Ending, net 1,612,108 1,981,646
Others [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net (1,503,265) (1,413,733)
Ending, net (1,344,573) (1,503,265)
Construction-in-progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 825,988 713,593
Acquisition and capital expenditure 3,419,136 2,037,085
Disposal and termination (1,362) (582)
Impairment (27) (170)
Transfer in (out) (3,217,044) (1,911,094)
Others (26,423) (12,844)
Ending, net 1,000,268 825,988
Construction-in-progress [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 826,583 714,706
Ending, net 1,001,171 826,583
Construction-in-progress [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net (595) (1,113)
Ending, net ₩ (903) ₩ (595)