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Income tax expense (benefit) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income tax expense (benefit) [Abstract]      
Current income tax expense ₩ 658,909 ₩ 308,480 ₩ 286,375
Payment of income tax 671,179 538,223 378,715
Adjustment in respect of prior years due to change in estimate (63,756) (176,440) (195,648)
Current income tax directly recognized in equity 51,486 (53,302) 101,528
Income tax directly adjusted to shareholders' equity (except for accumulated other comprehensive income (loss)) 4,273 3,432  
Dividends of hybrid bond 4,273 3,432 4,273
Income tax recognized as other comprehensive income (loss) 47,213 (56,733)  
Gain(loss) on valuation of financial assets at fair value through other comprehensive income 19,447 (4,217) 35,798
Net change in the unrealized fair value of derivatives using cash flow hedge accounting (47,231) (15,642) 6,639
Remeasurements of defined benefit liability 14,971 (40,235) 53,703
Investments in associates 35,714 4,275 6,592
Others 24,311 (914) (5,477)
Effect of change in accounting policy 0 0 1,780
Deferred income tax expense (benefit) 240,155 (1,310,783) (1,112,696)
Generation and realization of temporary differences (77,985) (636,984) (495,658)
Changes of unrecognized tax losses, tax credit and temporary differences for prior periods (10,471) (22,469) (28,509)
Changes in deferred tax on tax losses carryforwards 296,070 (582,011) (572,305)
Tax credit carryforwards 32,541 (71,306) (16,224)
Amount due to change in tax rate or regulations 0 1,987 0
Income tax expense (benefit) ₩ 899,064 ₩ (1,002,303) ₩ (826,321)