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Property and Equipment - Summary of Changes in Property and Equipment (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net ₩ 13,562,319 ₩ 14,312,111
Acquisition and capital expenditure 2,287,630 2,631,431
Disposal and termination (124,542) (196,138)
Depreciation (2,690,760) (2,755,236)
Impairment (15,893) (9,285)
Transfer in (out) 1,024 (310,687)
Inclusion in scope of consolidation 6,798  
Exclusion from scope of consolidation   (945)
Transfer from(to) investment properties 39,363 (61,472)
Others 2,318 (47,460)
Ending, net 13,068,257 13,562,319
Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 43,626,804 43,133,769
Ending, net 44,289,629 43,626,804
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net (30,064,485) (28,821,658)
Ending, net (31,221,372) (30,064,485)
Land [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 1,268,657 1,308,952
Acquisition and capital expenditure 9,897 1,948
Disposal and termination (3,718) (4,656)
Transfer in (out) 7,663 26,764
Transfer from(to) investment properties (3,080) (64,449)
Others 1,768 98
Ending, net 1,281,187 1,268,657
Land [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 1,268,789 1,309,084
Ending, net 1,281,319 1,268,789
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 2,012,422 2,124,732
Acquisition and capital expenditure 1,728 120
Disposal and termination (2,640) (4,022)
Depreciation (132,353) (135,242)
Impairment (5,551)  
Transfer in (out) 127,052 25,305
Inclusion in scope of consolidation 44  
Exclusion from scope of consolidation   (19)
Transfer from(to) investment properties 5,366 1,793
Others 1,617 (245)
Ending, net 2,007,685 2,012,422
Buildings [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 3,750,861 3,729,228
Ending, net 3,873,074 3,750,861
Buildings [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net (1,738,439) (1,604,496)
Ending, net (1,865,389) (1,738,439)
Machinery and equipment1 [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 9,060,809 9,260,185
Acquisition and capital expenditure 137,088 237,218
Disposal and termination (113,266) (176,085)
Depreciation (2,398,782) (2,469,459)
Impairment (1,237) (9,256)
Transfer in (out) 1,767,878 2,227,808
Inclusion in scope of consolidation 4,228  
Exclusion from scope of consolidation   (772)
Others 18,298 (8,830)
Ending, net 8,475,016 9,060,809
Machinery and equipment1 [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 35,971,877 35,106,184
Ending, net 36,327,007 35,971,877
Machinery and equipment1 [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net (26,911,068) (25,845,999)
Ending, net (27,851,991) (26,911,068)
Others [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 506,838 524,923
Acquisition and capital expenditure 101,832 129,464
Disposal and termination (4,336) (8,242)
Depreciation (159,625) (150,535)
Impairment (8,935) (1)
Transfer in (out) 9,525 10,344
Inclusion in scope of consolidation 2,526  
Exclusion from scope of consolidation   (120)
Transfer from(to) investment properties 37,077 1,184
Others (6,521) (179)
Ending, net 478,381 506,838
Others [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 1,920,571 1,895,332
Ending, net 1,981,646 1,920,571
Others [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net (1,413,733) (1,370,409)
Ending, net (1,503,265) (1,413,733)
Construction-in-progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 713,593 1,093,319
Acquisition and capital expenditure 2,037,085 2,262,681
Disposal and termination (582) (3,133)
Impairment (170) (28)
Transfer in (out) (1,911,094) (2,600,908)
Exclusion from scope of consolidation   (34)
Others (12,844) (38,304)
Ending, net 825,988 713,593
Construction-in-progress [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net 714,706 1,093,941
Ending, net 826,583 714,706
Construction-in-progress [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning, net (1,113) (622)
Ending, net ₩ (595) ₩ (1,113)