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Changes in Accounting Policies - Determination of Lease Term Considering Economic Penalty (Tables) | 12 Months Ended
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Dec. 31, 2020
Text block [abstract] |
Disclosure Of Detailed Information About Impact On Consolidated Financial Statements Due to Application of Accounting Policy Explanatory | In relation to the changes in accounting policy, the adjusted amounts recognized in each line item in the consolidated financial statements are as follows: Consolidated Statements of Financial Position
|  | December 31, 2019 |  |  | December 31, 2020 |
(In millions of Korean won) |  | Previously reported amount |  |  | Adjustment |  |  | Adjusted amount |  |  | Amount based on previous policy |  |  | Adjustment |  |  | Amount based on changed policy |
Current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses |  | ￦ | 76,036 |  |  | ￦ | (1,026 | ) |  | ￦ | 75,010 |  |  | ￦ | 61,930 |  |  | ￦ | (2,119 | ) |  | ￦ | 59,811 |
Non-current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets |  |  | 788,497 |  |  |  | 479,832 |  |  |  | 1,268,329 |  |  |  | 585,034 |  |  |  | 632,145 |  |  |  | 1,217,179 |
Current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease liabilities |  | ￦ | 355,833 |  |  | ￦ | 36,600 |  |  | ￦ | 392,433 |  |  | ￦ | 281,961 |  |  | ￦ | 63,263 |  |  | ￦ | 345,224 |
Non-current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease liabilities |  |  | 373,307 |  |  |  | 445,612 |  |  |  | 818,919 |  |  |  | 231,884 |  |  |  | 566,532 |  |  |  | 798,416 |
Total liabilities |  | ￦ | 729,140 |  |  | ￦ | 482,212 |  |  | ￦ | 1,211,352 |  |  | ￦ | 513,845 |  |  | ￦ | 629,795 |  |  | ￦ | 1,143,640 |
Net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  | ￦ | 11,594,322 |  |  | ￦ | (3,406 | ) |  | ￦ | 11,590,916 |  |  | ￦ | 12,155,188 |  |  | ￦ | 232 |  |  | ￦ | 12,155,420 |
Total equity |  | ￦ | 11,594,322 |  |  | ￦ | (3,406 | ) |  | ￦ | 11,590,916 |  |  | ￦ | 12,155,188 |  |  | ￦ | 232 |  |  | ￦ | 12,155,420 |
Consolidated Statements of Operations
|  | 2019 |  |  | 2020 |
(In millions of Korean won) |  | Previously reported amount |  |  | Adjustment |  |  | Adjusted amount |  |  | Amount based on previous policy |  |  | Adjustment |  |  | Amount based on changed policy |
Operating revenue |  | ￦ | 24,899,189 |  |  | ￦ | — |  |  | ￦ | 24,899,189 |  |  | ￦ | 24,434,851 |  |  | ￦ | 5,796 |  |  | ￦ | 24,440,647 |
Operating expenses |  |  | 23,879,015 |  |  |  | (6,796 | ) |  |  | 23,872,219 |  |  |  | 23,425,377 |  |  |  | (7,063 | ) |  |  | 23,418,314 |
Finance income |  |  | 424,395 |  |  |  | — |  |  |  | 424,395 |  |  |  | 498,614 |  |  |  | — |  |  |  | 498,614 |
Finance costs |  |  | 421,931 |  |  |  | 10,202 |  |  |  | 432,133 |  |  |  | 498,161 |  |  |  | 9,222 |  |  |  | 507,383 |
Income tax expense |  |  | 320,060 |  |  |  | — |  |  |  | 320,060 |  |  |  | 285,349 |  |  |  | — |  |  |  | 285,349 |
Profit for the year |  |  | 699,274 |  |  |  | (3,406 | ) |  |  | 695,868 |  |  |  | 742,619 |  |  |  | 3,637 |  |  |  | 746,256 |
Basic earnings per share |  |  | 2,648 |  |  |  | (14 | ) |  |  | 2,634 |  |  |  | 2,843 |  |  |  | 15 |  |  |  | 2,858 |
Diluted earnings per share |  |  | 2,646 |  |  |  | (14 | ) |  |  | 2,632 |  |  |  | 2,840 |  |  |  | 18 |  |  |  | 2,858 |

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