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Timing of revenue recognition (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of performance obligations [Line Items]      
Total revenue from external customers ₩ 60,033,062 ₩ 59,335,889 ₩ 59,763,087
Domestic      
Disclosure of performance obligations [Line Items]      
Total revenue from external customers 57,799,991 55,652,807 55,310,011
Domestic | Performance obligations satisfied at point in time      
Disclosure of performance obligations [Line Items]      
Total revenue from external customers 57,514,866 55,373,316 54,982,095
Domestic | Performance obligations satisfied over time      
Disclosure of performance obligations [Line Items]      
Total revenue from external customers 285,125 279,491 327,916
Overseas      
Disclosure of performance obligations [Line Items]      
Total revenue from external customers [1] 2,233,071 3,683,082 4,453,076
Overseas | Performance obligations satisfied at point in time      
Disclosure of performance obligations [Line Items]      
Total revenue from external customers 382,938 399,232 397,392
Overseas | Performance obligations satisfied over time      
Disclosure of performance obligations [Line Items]      
Total revenue from external customers ₩ 1,850,133 ₩ 3,283,850 ₩ 4,055,684
[1] Middle East and other Asian countries make up the majority of overseas revenue and non-current assets. Since the overseas revenue or non-current assets attributable to particular countries are not material, they are not disclosed individually.