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Net Defined Benefit Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2019
Statement [LineItems] |
Summary of Amount Recognized in the Statements of Financial Position | The amounts recognized in the statements of financial position are determined as follows:
(In millions of Korean won) |  | December 31, 2018 |  |  | December 31, 2019 |
Present value of defined benefit obligations |  | ￦ | 2,201,876 |  |  | ￦ | 2,427,351 |
Fair value of plan assets |  |  | (1,643,046 | ) |  |  | (2,069,710 | )
Liabilities |  | ￦ | 561,269 |  |  | ￦ | 365,663 |
Assets in the statement of financial position |  | ￦ | 2,439 |  |  | ￦ | 8,022 |
Summary of Changes in the Defined Benefit Obligations | Changes in the defined benefit obligations for the years ended December 31, 2018 and 2019, are as follows:
(In millions of Korean won) |  | 2018 |  |  | 2019 |
Beginning |  | ￦ | 1,911,166 |  |  | ￦ | 2,201,876 |
Current service cost |  |  | 225,667 |  |  |  | 243,598 |
Interest expense |  |  | 51,691 |  |  |  | 47,403 |
Benefit paid |  |  | (121,372 | ) |  |  | (100,663 | )
Changes due to settlements of plan |  |  | 9,801 |  |  |  | 910 |
Remeasurements: |  |  |  |  |  |  |  |
Actuarial gains and losses arising from changes in demographic assumptions |  |  | 4,600 |  |  |  | 39 |
Actuarial gains and losses arising from changes in financial assumptions |  |  | 116,458 |  |  |  | 11,773 |
Actuarial gains and losses arising from experience adjustments |  |  | (19,919 | ) |  |  | 19,465 |
Changes in scope of consolidation |  |  | 23,784 |  |  |  | 2,950 |
Ending |  | ￦ | 2,201,876 |  |  | ￦ | 2,427,351 |
Changes in the fair value of plan assets for the years ended December 31, 2018 and 2019, are as follows:
(In millions of Korean won) |  | 2018 |  |  | 2019 |
Beginning |  | ￦ | 1,519,779 |  |  | ￦ | 1,643,046 |
Interest income |  |  | 41,233 |  |  |  | 35,386 |
Remeasurements: |  |  |  |  |  |  |  |
Return on plan assets (excluding amounts included in interest income) |  |  | 1,409 |  |  |  | (2,537 | )
Benefits paid |  |  | (116,303 | ) |  |  | (87,119 | )
Employer contributions |  |  | 179,100 |  |  |  | 476,916 |
Changes in scope of consolidation |  |  | 17,828 |  |  |  | 4,018 |
Ending |  | ￦ | 1,643,046 |  |  | ￦ | 2,069,710 |
Summary of Amounts Recognized in the Consolidated Statements of Operations | Amounts recognized in the consolidated statement s of operations for the years ended December 31, 2017, 2018 and 2019, are as follows:
(In millions of Korean won) |  | 2017 |  |  | 2018 |  |  | 2019 |
Current service cost |  | ￦ | 210,336 |  |  | ￦ | 225,667 |  |  | ￦ | 243,598 |
Net Interest cost |  |  | 8,691 |  |  |  | 10,458 |  |  |  | 12,017 |
Past service cost |  |  | (61 | ) |  |  | 9,801 |  |  |  | 910 |
Transfer out |  |  | (9,196 | ) |  |  | (13,881 | ) |  |  | (16,215 | )
Total expenses |  | ￦ | 209,770 |  |  | ￦ | 232,045 |  |  | ￦ | 240,310 |
Summary of Principal Actuarial Assumptions | Principal actuarial assumptions used are as follows:
|  | December 31, 2017 |  | December 31, 2018 |  | December 31, 2019
Discount rate |  | 1.85% ~ 3.66% |  | 2.20% ~ 3.34% |  | 1.66% ~ 3.00%
Future salary increase |  | 1.00% ~ 8.03% |  | 1.39% ~ 7.82% |  | 1.00% ~ 6.81%
Summary of Expected Maturity Analysis of Undiscounted Pension Benefits | The expected maturity analysis of undiscounted pension benefits as at December 31, 2019, is as follows:
(In millions of Korean won) |  | Less than 1 year |  |  | Between 1-2 years |  |  | Between 2-5 years |  |  | Over 5 years |  |  | Total |
Pension benefits |  | ￦ | 241,380 |  |  | ￦ | 273,477 |  |  | ￦ | 834,025 |  |  | ￦ | 3,849,346 |  |  | ￦ | 5,198,228 |
Defined benefit obligations [member] |
Statement [LineItems] |
Summary of Sensitivity of the Defined Benefit Obligations | The sensitivity of the defined benefit obligations as at December 31, 2019, to changes in the principal assumptions is:
(In percentage, in millions of Korean won) |  | Effect on defined benefit obligation |
|  | Changes in assumption |  | Increase in assumption |  |  | Decrease in assumption |
Discount rate |  | 0.5% point |  |  | ￦ (77,044 | ) |  |  | ￦ 83,574 |
Salary growth rate |  | 0.5% point |  |  | 76,010 |  |  |  | (70,874 | )

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