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Fair value measurement of instruments (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Financial assets, category | At fair value |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | ₩ 2,406,354 | ₩ 1,437,464
Fair value |  | 2,406,354 | 1,437,464
Financial assets, category | At amortized cost |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 14,676,310 | 14,226,421
Fair value |  | 14,676,310 | 14,226,421
Financial assets at fair value through other comprehensive income | At fair value |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 358,559 | 379,170
Fair value |  | 358,559 | 379,170
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument | At fair value |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 110,764 | 165,204
Fair value |  | 110,764 | 165,204
Derivative Financial Instruments, Assets | Designated as Hedging Instrument | At fair value |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 55,649 | 145,829
Fair value |  | 55,649 | 145,829
Financial assets at fair value through profit or loss | At fair value |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 1,881,382 | 747,261
Fair value |  | 1,881,382 | 747,261
Financial assets at amortized cost | At amortized cost |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 14,422 | 13,609
Fair value |  | 14,422 | 13,609
Loans and receivables | At amortized cost |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 790,162 | 738,707
Fair value |  | 790,162 | 738,707
Long-term financial instruments | At amortized cost |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 578,621 | 608,256
Fair value |  | 578,621 | 608,256
Short-term financial instruments | At amortized cost |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 1,483,482 | 1,351,971
Fair value |  | 1,483,482 | 1,351,971
Trade receivables | At amortized cost |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 9,780,039 | 9,703,749
Fair value |  | 9,780,039 | 9,703,749
Cash and Cash Equivalents | At amortized cost |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 2,029,584 | 1,810,129
Fair value |  | 2,029,584 | 1,810,129
Liabilities | At fair value |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 365,119 | 169,960
Fair value |  | 365,119 | 169,960
Liabilities | At amortized cost |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 82,461,514 | 81,491,703
Fair value |  | 87,398,465 | 85,246,892
Derivative Financial Instruments, Liabilities | Not Designated as Hedging Instrument | At fair value |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 157,926 | 53,147
Fair value |  | 157,926 | 53,147
Derivative Financial Instruments, Liabilities | Designated as Hedging Instrument | At fair value |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 207,193 | 116,813
Fair value |  | 207,193 | 116,813
Secured borrowings | At amortized cost |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 63,614 | 227,135
Fair value |  | 63,614 | 227,135
Unsecured bond | At amortized cost |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 64,607,401 | 63,171,664
Fair value |  | 68,839,316 | 66,917,421
Lease liabilities | At amortized cost |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 4,621,096 | 5,070,133
Fair value |  | 4,621,096 | 5,070,133
Unsecured borrowings | At amortized cost |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 4,808,206 | 4,104,523
Fair value |  | 5,513,242 | 4,113,955
Trade and other payables | At amortized cost |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value | [1] | 8,115,837 | 8,545,029
Fair value | [1] | 8,115,837 | 8,545,029
Bank overdraft | At amortized cost |  |  |
Disclosure of fair value measurement of instruments [Line Items] |  |  |
Book value |  | 245,360 | 373,219
Fair value |  | ₩ 245,360 | ₩ 373,219
[1] | Excludes lease liabilities.

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