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Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2018
Text block [abstract] |
Summary of Carrying Amount and Fair Value of Financial Instruments by Category | Carrying amount and fair value of financial instruments by category as at December 31, 2017 and 2018, are as follows:
|  | December 31, 2017 |  |  | December 31, 2018 |
(In millions of Korean won) |  | Carrying amount |  |  | Fair value |  |  | Carrying amount |  |  | Fair value |
Financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | ￦ | 1,928,182 |  |  |  | 1 |  |  | ￦ | 2,703,422 |  |  |  | 1 |
Trade and other receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets measured at amortized cost |  |  | 6,793,397 |  |  |  | 1 |  |  |  | 5,425,996 |  |  |  | 1 |
Financial assets at fair value through other comprehensive income |  |  | — |  |  |  | — |  |  |  | 1,097,348 |  |  |  | 1,097,348 |
Other financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets measured at amortized cost2 |  |  | 1,333,368 |  |  |  | 1 |  |  |  | 484,271 |  |  |  | 1 |
Financial assets at fair value through profit or loss2 |  |  | 5,913 |  |  |  | 5,913 |  |  |  | 777,685 |  |  |  | 777,685 |
Financial assets at fair value through other comprehensive income2 |  |  | — |  |  |  | — |  |  |  | 326,157 |  |  |  | 326,157 |
Available-for-sale financial assets3 |  |  | 319,402 |  |  |  | 319,402 |  |  |  | — |  |  |  | — |
Derivative financial assets for hedging |  |  | 7,389 |  |  |  | 7,389 |  |  |  | 29,843 |  |  |  | 29,843 |
Total |  | ￦ | 10,387,651 |  |  |  |  |  |  | ￦ | 10,844,722 |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade and other payables |  | ￦ | 8,427,457 |  |  |  | 1 |  |  | ￦ | 8,521,379 |  |  |  | 1 |
Borrowings |  |  | 6,683,662 |  |  |  | 6,738,326 |  |  |  | 6,648,293 |  |  |  | 1 |
Other financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities at amortized cost |  |  | 87,670 |  |  |  | 1 |  |  |  | 99,330 |  |  |  | 1 |
|  | December 31, 2017 |  |  | December 31, 2018 |
(In millions of Korean won) |  | Carrying amount |  |  | Fair value |  |  | Carrying amount |  |  | Fair value |
Financial liabilities at fair value through profit or loss |  |  | 5,051 |  |  |  | 5,051 |  |  |  | 7,758 |  |  |  | 7,758 |
Derivative financial liabilities for hedging |  |  | 93,770 |  |  |  | 93,770 |  |  |  | 57,308 |  |  |  | 57,308 |
Total |  | ￦ | 15,297,610 |  |  |  |  |  |  | ￦ | 15,334,068 |  |  |  |  |
| 1 | The Group did not conduct fair value estimation since the book amount is a reasonable approximation of the fair value.
| 2 | In the prior year, a portion of the equity instrument was classified as available-for-sale financial assets and financial assets held-to-maturity.
| 3 | As at December 31, 2017, equity instruments that do not have a quoted price in an active market are measured at cost because their fair value cannot be measured reliably and excluded from the fair value disclosures.
Summary of Fair Value Hierarchy Classifications of Financial Assets and Financial Liabilities That are Measured at Fair Value | Fair value hierarchy classifications of the financial assets and financial liabilities that are measured at fair value or its fair value is disclosed as at December 31, 2017 and 2018, are as follows:
|  | December 31, 2017 |
(In millions of Korean won) |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recurring fair value measurements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets at fair value through profit or loss |  | ￦ | — |  |  | ￦ | — |  |  | ￦ | 5,813 |  |  | ￦ | 5,813 |
Derivative financial assets for hedging |  |  | — |  |  |  | 7,389 |  |  |  | — |  |  |  | 7,389 |
Available-for-sale financial assets |  |  | 6,859 |  |  |  | 5,466 |  |  |  | 307,077 |  |  |  | 319,402 |
Disclosed fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment properties1 |  |  | — |  |  |  | — |  |  |  | 1,755,600 |  |  |  | 1,755,600 |
Total |  | ￦ | 6,859 |  |  | ￦ | 12,855 |  |  | ￦ | 2,068,490 |  |  | ￦ | 2,088,204 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recurring fair value measurements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities at fair value through profit or loss |  | ￦ | — |  |  | ￦ | — |  |  | ￦ | 5,051 |  |  | ￦ | 5,051 |
Derivative financial liabilities for hedging |  |  | — |  |  |  | 76,045 |  |  |  | 17,725 |  |  |  | 93,770 |
Total |  | ￦ | — |  |  | ￦ | 76,045 |  |  | ￦ | 22,776 |  |  | ￦ | 98,821 |
| 1 | The highest and best use of a non-financial asset does not differ from its current use.
Summary of Fair Value Non of Financial Instruments |
|  | December 31, 2018 |
(In millions of Korean won) |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade and other receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets at fair value through other comprehensive income |  | ￦ | — |  |  | ￦ | 1,097,348 |  |  | ￦ | — |  |  | ￦ | 1,097,348 |
Other financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets at fair value through profit or loss1 |  |  | 121 |  |  |  | 613,964 |  |  |  | 163,600 |  |  |  | 777,685 |
Financial assets at fair value through other comprehensive income1 |  |  | 8,861 |  |  |  | 5,760 |  |  |  | 311,536 |  |  |  | 326,157 |
Derivative financial assets for hedging |  |  | — |  |  |  | 29,843 |  |  |  | — |  |  |  | 29,843 |
Disclosed fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment properties2 |  |  | — |  |  |  | — |  |  |  | 1,821,061 |  |  |  | 1,821,061 |
Total |  | ￦ | 8,982 |  |  | ￦ | 1,746,915 |  |  | ￦ | 2,296,197 |  |  | ￦ | 4,052,094 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities at fair value through profit or loss |  | ￦ | — |  |  | ￦ | — |  |  | ￦ | 7,758 |  |  | ￦ | 7,758 |
Derivative financial liabilities for hedging |  |  | — |  |  |  | 47,125 |  |  |  | 10,183 |  |  |  | 57,308 |
Total |  | ￦ | — |  |  | ￦ | 47,125 |  |  | ￦ | 17,941 |  |  | ￦ | 65,066 |
| 1 | In the prior year, a portion of the equity instrument was classified as available-for-sale financial assets.
| 2 | The highest and best use of a non-financial asset does not differ from its current use.
Summary of Changes in Level 3 of Fair Value Hierarchy for Recurring Fair Value Measurements |
| (b) | Details of changes in Level 3 of the fair value hierarchy for the recurring fair value measurements as at December 31, 2017 and 2018, are as follows:
|  | 2017 |
(In millions of Korean won) |  | Financial assets at fair value through profit or loss |  |  | Available-for-sale |  |  | Other derivative financial liabilities |  |  | Derivative financial liabilities for hedging |
Beginning balance |  | ￦ | 6,277 |  |  | ￦ | 287,889 |  |  | ￦ | 1,973 |  |  | ￦ | — |
Reclassification |  |  | — |  |  |  | (277 | ) |  |  | — |  |  |  | — |
Amount recognized in other comprehensive income |  |  | — |  |  |  | 58,450 |  |  |  | — |  |  |  | (1,909 | )
Purchases |  |  | — |  |  |  | 85,287 |  |  |  | — |  |  |  | — |
Amount recognized in profit or loss |  |  | (464 | ) |  |  | (113 | ) |  |  | 3,078 |  |  |  | 19,634 |
Sales |  |  | — |  |  |  | (124,159 | ) |  |  | — |  |  |  | — |
Ending balance |  | ￦ | 5,813 |  |  | ￦ | 307,077 |  |  | ￦ | 5,051 |  |  | ￦ | 17,725 |
|  | 2018 |
|  | Financial assets |  |  | Financial liabilities |
(In millions of Korean won) |  | Financial assets at fair value through profit or loss3 |  |  | Financial assets at fair value through other comprehensive income3 |  |  | Financial liabilities at fair value through profit or loss2 |  |  | Derivative financial liabilities for hedging1 |
Beginning balance |  | ￦ | 97,547 |  |  | ￦ | 238,517 |  |  | ￦ | 5,051 |  |  | ￦ | 17,725 |
Changes in accounting policy |  |  | 32,745 |  |  |  | 2,085 |  |  |  | — |  |  |  | — |
Purchases |  |  | 21,365 |  |  |  | 8,802 |  |  |  | — |  |  |  | — |
Reclassification |  |  | 1,581 |  |  |  | (296 | ) |  |  | — |  |  |  | — |
Changes in scope of consolidation |  |  | — |  |  |  | 364 |  |  |  | — |  |  |  | — |
Sales |  |  | (1,852 | ) |  |  | (1,099 | ) |  |  | — |  |  |  | — |
Amount recognized in profit or loss1,2 |  |  | 12,214 |  |  |  | 89 |  |  |  | 2,707 |  |  |  | (17,255 | )
Amount recognized in other comprehensive income1 |  |  | — |  |  |  | 63,074 |  |  |  | — |  |  |  | 9,713 |
Ending balance |  | ￦ | 163,600 |  |  | ￦ | 311,536 |  |  | ￦ | 7,758 |  |  | ￦ | 10,183 |
| 1 | Amount recognized in profit or loss of derivative financial liabilities for hedging are comprised of both gain on valuation of derivatives and accumulated other comprehensive loss.
| 2 | Amount recognized in profit or loss of derivative financial liabilities for hedging are comprised of loss on valuation of derivatives.
| 3 | In prior year, a portion of the equity instrument was classified as available-for-sale financial assets.
Summary of Valuation Techniques and Inputs | Valuation techniques and inputs used in the recurring, non-recurring fair value measurements and disclosed fair values categorized within Level 2 and Level 3 of the fair value hierarchy as at December 31, 2017 and 2018, are as follows:
|  | December 31, 2017
(In millions of Korean won) |  | Fair value |  |  | Level |  |  | Valuation techniques
Assets |  |  |  |  |  |  |  |  |  |
Other financial assets |  |  |  |  |  |  |  |  |  |
Derivative financial assets for hedging |  | ￦ | 7,389 |  |  |  | 2 |  |  | DCF Model
Available-for-sale financial assets |  |  | 312,543 |  |  |  | 2,3 |  |  | DCF Model
Financial assets at fair value through profit or loss |  |  | 5,813 |  |  |  | 3 |  |  | DCF Model
Investment properties |  |  | 1,755,600 |  |  |  | 3 |  |  | DCF Model
Liabilities |  |  |  |  |  |  |  |  |  |
Other financial liabilities |  |  |  |  |  |  |  |  |  |
Derivative financial liabilities for hedging |  | ￦ | 93,770 |  |  |  | 2,3 |  |  | Hull-White model, DCF Model
Other derivative financial liabilities |  |  | 5,051 |  |  |  | 3 |  |  | DCF Model, Comparable Company Analysis
|  | December 31, 2018
(In millions of Korean won) |  | Fair value |  |  | Level |  |  | Valuation techniques
Assets |  |  |  |  |  |  |  |  |  |
Trade and other receivables |  |  |  |  |  |  |  |  |  |
Financial assets at fair value through other comprehensive income |  | ￦ | 1,097,348 |  |  |  | 2 |  |  | DCF Model
Other financial assets |  |  |  |  |  |  |  |  |  |
Financial assets at fair value through profit or loss |  |  | 777,564 |  |  |  | 2,3 |  |  | DCF Model, Adjusted net asset model
Financial assets at fair value through other comprehensive income |  |  | 317,296 |  |  |  | 2,3 |  |  | DCF Model
Derivative financial assets for hedging |  |  | 29,843 |  |  |  | 2 |  |  | DCF Model
Investment properties |  |  | 1,821,061 |  |  |  | 3 |  |  | DCF Model
Liabilities |  |  |  |  |  |  |  |  |  |
Other financial liabilities |  |  |  |  |  |  |  |  |  |
Financial liabilities at fair value through profit or loss |  | ￦ | 7,758 |  |  |  | 3 |  |  | DCF Model, Comparable Company Analysis
Derivative financial liabilities for hedging |  |  | 57,308 |  |  |  | 2,3 |  |  | Hull-White model, DCF Model
Summary of Details and Changes of Total Deferred Difference | In relation to this, details and changes of the total deferred difference for the years ended December 31, 2017 and 2018, are as follows:
(In millions of Korean won) |  | 2017 |  |  | 2018 |
| Derivatives used for hedging |  |  | Derivative held for trading |  |  | Derivatives used for hedging |  |  | Derivative held for trading |
I. Beginning balance |  | ￦ | — |  |  | ￦ | (8,470 | ) |  | ￦ | 6,532 |  |  | ￦ | (5,647 | )
II. New transactions |  |  | 7,126 |  |  |  | — |  |  |  | — |  |  |  | — |
III. Recognized at fair value through profit or loss |  |  | (594 | ) |  |  | 2,823 |  |  |  | (1,425 | ) |  |  | 2,823 |
IV. Ending balance (I+II+III) |  | ￦ | 6,532 |  |  | ￦ | (5,647 | ) |  | ￦ | 5,107 |  |  | ￦ | (2,824 | )

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