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Timing of revenue recognition (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of performance obligations [Line Items] |  |  |  |
Total revenue from external customers |  | ₩ 57,925,837 | ₩ 58,568,082 | ₩ 60,033,062
Domestic |  |  |  |
Disclosure of performance obligations [Line Items] |  |  |  |
Total revenue from external customers |  | 56,774,578 | 56,942,128 | 57,799,991
Domestic | Performance obligations satisfied at point in time |  |  |  |
Disclosure of performance obligations [Line Items] |  |  |  |
Total revenue from external customers |  | 56,380,608 | 56,609,330 | 57,514,866
Domestic | Performance obligations satisfied over time |  |  |  |
Disclosure of performance obligations [Line Items] |  |  |  |
Total revenue from external customers |  | 393,970 | 332,798 | 285,125
Overseas |  |  |  |
Disclosure of performance obligations [Line Items] |  |  |  |
Total revenue from external customers | [1] | 1,151,259 | 1,625,954 | 2,233,071
Overseas | Performance obligations satisfied at point in time |  |  |  |
Disclosure of performance obligations [Line Items] |  |  |  |
Total revenue from external customers |  | 303,704 | 285,546 | 382,938
Overseas | Performance obligations satisfied over time |  |  |  |
Disclosure of performance obligations [Line Items] |  |  |  |
Total revenue from external customers |  | ₩ 847,555 | ₩ 1,340,408 | ₩ 1,850,133
[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.

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