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Timing of revenue recognition (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of performance obligations [Line Items]      
Total revenue from external customers ₩ 58,568,082 ₩ 60,033,062 ₩ 59,335,889
Domestic      
Disclosure of performance obligations [Line Items]      
Total revenue from external customers 56,942,128 57,799,991 55,652,807
Domestic | Performance obligations satisfied at point in time      
Disclosure of performance obligations [Line Items]      
Total revenue from external customers 56,609,330 57,514,866 55,373,316
Domestic | Performance obligations satisfied over time      
Disclosure of performance obligations [Line Items]      
Total revenue from external customers 332,798 285,125 279,491
Overseas      
Disclosure of performance obligations [Line Items]      
Total revenue from external customers [1] 1,625,954 2,233,071 3,683,082
Overseas | Performance obligations satisfied at point in time      
Disclosure of performance obligations [Line Items]      
Total revenue from external customers 285,546 382,938 399,232
Overseas | Performance obligations satisfied over time      
Disclosure of performance obligations [Line Items]      
Total revenue from external customers ₩ 1,340,408 ₩ 1,850,133 ₩ 3,283,850
[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.