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Income tax expense (benefit) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income tax expense (benefit) [Abstract]      
Current income tax expense ₩ 308,480 ₩ 286,375 ₩ 829,969
Payment of income tax 538,223 378,715 881,583
Adjustment in respect of prior years due to change in estimate (176,440) (195,648) 4,484
Current income tax directly recognized in equity (53,302) 101,528 (56,098)
Income tax directly adjusted to shareholders' equity (except for accumulated other comprehensive income (loss)) 3,432 4,273 5,223
Dividends of hybrid bond 3,432 4,273 5,248
Effect of change in effective tax rate 0 0 (25)
Income tax recognized as other comprehensive income (loss) (56,733) 97,255 (61,321)
Gain(loss) on valuation of financial assets at fair value through other comprehensive income (4,217) 35,798 0
Loss on valuation of available-for-sale financial assets 0 0 (2,551)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (15,642) 6,639 (11,016)
Remeasurements of defined benefit obligations (40,235) 53,703 (80,645)
Investments in associates 4,275 6,592 8,649
Others (914) (5,477) 24,242
Effect of change in accounting policy 0 1,780 0
Deferred income tax expense (benefit) (1,310,783) (1,112,696) 1,342,855
Generation and realization of temporary differences (636,984) (495,658) 1,283,012
Changes of unrecognized tax losses, tax credit and temporary differences for prior periods (22,469) (28,509) 44,573
Changes in deferred tax on tax losses carryforwards (582,011) (572,305) 0
Tax credit carryforwards (71,306) (16,224) 15,270
Amount due to change in tax rate or regulations 1,987 0 0
Income tax expense (benefit) ₩ (1,002,303) ₩ (826,321) ₩ 2,172,824