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Fair Value - Summary of Fair Value Non of Financial Instruments (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | ₩ 6,154,743 | ₩ 4,840,220
Non financial liabilities | 8,812,993 | 7,773,727
Level 1 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 41,613 | 52,055
Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 876,872 | 1,659,385
Non financial liabilities | 8,597,661 | 7,766,896
Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 5,236,258 | 3,128,780
Non financial liabilities | 215,332 | 6,831
Financial assets at fair value through other comprehensive income [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 491,713 | 1,118,619
Financial assets at fair value through other comprehensive income [member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 491,713 | 1,118,619
Financial assets at fair value through profit or loss [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 952,319 | 809,919
Financial assets at fair value through profit or loss [member] | Level 1 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 24,285 | 46,449
Financial assets at fair value through profit or loss [member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 310,095 | 330,961
Financial assets at fair value through profit or loss [member] | Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 617,939 | 432,509
Other financial assets at fair value through other comprehensive income [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 347,877 | 258,516
Other financial assets at fair value through other comprehensive income [member] | Level 1 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 17,328 | 5,606
Other financial assets at fair value through other comprehensive income [member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 7,176 | 202,121
Other financial assets at fair value through other comprehensive income [member] | Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 323,373 | 50,789
Derivative financial assets for hedging [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 99,453 | 7,684
Derivative financial assets for hedging [member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 67,888 | 7,684
Derivative financial assets for hedging [member] | Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 31,565 |
Investment Properties [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 4,263,381 | 2,645,482
Investment Properties [member] | Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial assets | 4,263,381 | 2,645,482
Borrowings [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial liabilities | 8,578,827 | 7,643,116
Borrowings [Member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial liabilities | 8,578,827 | 7,643,116
Other financial liabilities at fair value through profit or loss [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial liabilities | 216,040 | 2,682
Other financial liabilities at fair value through profit or loss [member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial liabilities | 708 | 45
Other financial liabilities at fair value through profit or loss [member] | Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial liabilities | 215,332 | 2,637
Derivative financial liabilities for hedging [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial liabilities | 18,126 | 127,929
Derivative financial liabilities for hedging [member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial liabilities | ₩ 18,126 | 123,735
Derivative financial liabilities for hedging [member] | Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non financial liabilities |  | ₩ 4,194

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