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Detailed information about intangible assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value ₩ 1,187,121 ₩ 980,821  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 980,821    
Changes in intangible assets other than goodwill [Abstract]      
Impairment loss 20 3,945 ₩ 22
Ending balance 1,187,121 980,821  
Intangible assets other than goodwill [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 1,187,121 980,821 855,832
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 980,821 855,832  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition 143,887 124,422  
Disposal (661) (589)  
Amortization (113,672) (79,715)  
Impairment loss 34 (3,942)  
Others 176,712 84,813  
Ending balance 1,187,121 980,821 855,832
Intangible assets other than goodwill [Member] | Carrying Amount Other than Government Grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 1,201,860 997,679 873,882
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 997,679 873,882  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition 143,904 126,019  
Disposal (661) (589)  
Amortization (116,748) (82,747)  
Impairment loss 34 (3,942)  
Others 177,652 85,056  
Ending balance 1,201,860 997,679 873,882
Intangible assets other than goodwill [Member] | Acquisition cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 2,897,446 2,581,539  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 2,581,539    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance 2,897,446 2,581,539  
Intangible assets other than goodwill [Member] | Accumulated amortization [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (1,679,576) (1,567,795)  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (1,567,795)    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance (1,679,576) (1,567,795)  
Intangible assets other than goodwill [Member] | Accumulated impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (16,010) (16,065)  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (16,065)    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance (16,010) (16,065)  
Intangible assets other than goodwill [Member] | Government grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (14,739) (16,858) (18,050)
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (16,858) (18,050)  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition (17) (1,597)  
Amortization 3,076 3,032  
Others (940) (243)  
Ending balance (14,739) (16,858) (18,050)
Software [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 125,405 92,626 57,187
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 92,626 57,187  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition 12,683 18,267  
Disposal (5)    
Amortization (44,554) (32,129)  
Others 64,655 49,301  
Ending balance 125,405 92,626 57,187
Software [Member] | Carrying Amount Other than Government Grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 125,891 93,221 57,886
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 93,221 57,886  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition 12,700 18,267  
Disposal (5)    
Amortization (44,809) (32,378)  
Others 64,784 49,446  
Ending balance 125,891 93,221 57,886
Software [Member] | Acquisition cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 534,191 458,382  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 458,382    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance 534,191 458,382  
Software [Member] | Accumulated amortization [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (408,300) (365,161)  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (365,161)    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance (408,300) (365,161)  
Software [Member] | Government grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (486) (595) (699)
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (595) (699)  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition (17)    
Amortization 255 249  
Others (129) (145)  
Ending balance (486) (595) (699)
Licences and franchises [Member] | Acquisition cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 3,398 3,398  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 3,398    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance 3,398 3,398  
Licences and franchises [Member] | Accumulated amortization [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (3,398) (3,398)  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (3,398)    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance (3,398) (3,398)  
Copyrights, patents rights and other industrial rights [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 23,981 20,081 21,875
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 20,081 21,875  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition 30 85  
Disposal (7) (39)  
Amortization (3,350) (2,697)  
Others 7,227 857  
Ending balance 23,981 20,081 21,875
Copyrights, patents rights and other industrial rights [Member] | Carrying Amount Other than Government Grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 23,981 20,081 21,875
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 20,081 21,875  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition 30 85  
Disposal (7) (39)  
Amortization (3,350) (2,697)  
Others 7,227 857  
Ending balance 23,981 20,081 21,875
Copyrights, patents rights and other industrial rights [Member] | Acquisition cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 43,857 35,756  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 35,756    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance 43,857 35,756  
Copyrights, patents rights and other industrial rights [Member] | Accumulated amortization [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (19,876) (15,675)  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (15,675)    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance (19,876) (15,675)  
Mining rights [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 539,633 538,860 499,537
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 538,860 499,537  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition 26,751 26,311  
Disposal (272)    
Amortization (4,640) (899)  
Others (21,066) 13,911  
Ending balance 539,633 538,860 499,537
Mining rights [Member] | Carrying Amount Other than Government Grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 539,633 538,860 499,537
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 538,860 499,537  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition 26,751 26,311  
Disposal (272)    
Amortization (4,640) (899)  
Others (21,066) 13,911  
Ending balance 539,633 538,860 499,537
Mining rights [Member] | Acquisition cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 553,876 549,371  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 549,371    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance 553,876 549,371  
Mining rights [Member] | Accumulated amortization [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (14,243) (10,511)  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (10,511)    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance (14,243) (10,511)  
Development expenditures [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 80,816 57,253 44,972
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 57,253 44,972  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition 494 212  
Amortization (23,113) (19,222)  
Others 46,182 31,291  
Ending balance 80,816 57,253 44,972
Development expenditures [Member] | Carrying Amount Other than Government Grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 84,518 62,405 51,807
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 62,405 51,807  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition 494 212  
Amortization (25,924) (21,993)  
Others 47,543 32,379  
Ending balance 84,518 62,405 51,807
Development expenditures [Member] | Acquisition cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 836,996 785,966  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 785,966    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance 836,996 785,966  
Development expenditures [Member] | Accumulated amortization [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (752,478) (723,561)  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (723,561)    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance (752,478) (723,561)  
Development expenditures [Member] | Government grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (3,702) (5,152) (6,835)
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (5,152) (6,835)  
Changes in intangible assets other than goodwill [Abstract]      
Amortization 2,811 2,771  
Others (1,361) (1,088)  
Ending balance (3,702) (5,152) (6,835)
Intangible assets under development [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 129,370 104,443 84,403
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 104,443 84,403  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition 56,527 64,991  
Impairment loss (20) (3,945)  
Others (31,580) (41,006)  
Ending balance 129,370 104,443 84,403
Intangible assets under development [Member] | Carrying Amount Other than Government Grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 139,910 115,533 94,886
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 115,533 94,886  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition 56,527 66,588  
Impairment loss (20) (3,945)  
Others (32,130) (41,996)  
Ending balance 139,910 115,533 94,886
Intangible assets under development [Member] | Acquisition cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 143,851 119,474  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 119,474    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance 143,851 119,474  
Intangible assets under development [Member] | Accumulated impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (3,941) (3,941)  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (3,941)    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance (3,941) (3,941)  
Intangible assets under development [Member] | Government grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (10,540) (11,090) (10,483)
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (11,090) (10,483)  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition   (1,597)  
Others 550 990  
Ending balance (10,540) (11,090) (10,483)
Usage rights of donated assets and other [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 101,647 84,081 48,559
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 84,081 48,559  
Changes in intangible assets other than goodwill [Abstract]      
Amortization (14,452) (15,502)  
Others 32,018 51,024  
Ending balance 101,647 84,081 48,559
Usage rights of donated assets and other [Member] | Carrying Amount Other than Government Grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 101,658 84,102 48,591
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 84,102 48,591  
Changes in intangible assets other than goodwill [Abstract]      
Amortization (14,462) (15,513)  
Others 32,018 51,024  
Ending balance 101,658 84,102 48,591
Usage rights of donated assets and other [Member] | Acquisition cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 459,682 426,346  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 426,346    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance 459,682 426,346  
Usage rights of donated assets and other [Member] | Accumulated amortization [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (358,024) (342,244)  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (342,244)    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance (358,024) (342,244)  
Usage rights of donated assets and other [Member] | Government grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (11) (21) (32)
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (21) (32)  
Changes in intangible assets other than goodwill [Abstract]      
Amortization 10 11  
Ending balance (11) (21) (32)
Leasehold rights [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 5,044 4,632 745
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 4,632 745  
Changes in intangible assets other than goodwill [Abstract]      
Amortization (545) (351)  
Others 957 4,238  
Ending balance 5,044 4,632 745
Leasehold rights [Member] | Carrying Amount Other than Government Grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 5,044 4,632 745
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 4,632 745  
Changes in intangible assets other than goodwill [Abstract]      
Amortization (545) (351)  
Others 957 4,238  
Ending balance 5,044 4,632 745
Leasehold rights [Member] | Acquisition cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 24,306 23,350  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 23,350    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance 24,306 23,350  
Leasehold rights [Member] | Accumulated amortization [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (19,262) (18,718)  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (18,718)    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance (19,262) (18,718)  
Greenhouse gas emissions rights [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 6,283 6,283 805
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 6,283 805  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition   6,283  
Others (6,283) (805)  
Ending balance   6,283 805
Greenhouse gas emissions rights [Member] | Carrying Amount Other than Government Grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 6,283 6,283 805
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 6,283 805  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition   6,283  
Others (6,283) (805)  
Ending balance   6,283 805
Greenhouse gas emissions rights [Member] | Acquisition cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 6,283 6,283  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 6,283    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance   6,283  
Others [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 181,225 72,562 97,749
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 72,562 97,749  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition 47,402 8,273  
Disposal (377) (550)  
Amortization (23,018) (8,915)  
Impairment loss 54 3  
Others 84,602 (23,998)  
Ending balance 181,225 72,562 97,749
Others [Member] | Carrying Amount Other than Government Grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 181,225 72,562 97,750
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 72,562 97,750  
Changes in intangible assets other than goodwill [Abstract]      
Acquisition 47,402 8,273  
Disposal (377) (550)  
Amortization (23,018) (8,916)  
Impairment loss 54 3  
Others 84,602 (23,998)  
Ending balance 181,225 72,562 97,750
Others [Member] | Acquisition cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 297,289 173,213  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 173,213    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance 297,289 173,213  
Others [Member] | Accumulated amortization [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (103,995) (88,527)  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (88,527)    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance (103,995) (88,527)  
Others [Member] | Accumulated impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (12,069) (12,124)  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance (12,124)    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance (12,069) (12,124)  
Others [Member] | Government grants [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value   (1) (1)
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance   (1)  
Changes in intangible assets other than goodwill [Abstract]      
Amortization   1  
Ending balance     ₩ (1)
Goodwill [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 2,582 2,582  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 2,582    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance 2,582 2,582  
Goodwill [Member] | Acquisition cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 2,582 2,582  
Reconciliation of changes in intangible assets other than goodwill [Abstract]      
Beginning balance 2,582    
Changes in intangible assets other than goodwill [Abstract]      
Ending balance ₩ 2,582 ₩ 2,582