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Timing of revenue recognition (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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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.

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