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Income tax expense (benefit) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income tax expense (benefit) [Abstract]      
Current income tax expense ₩ 286,375 ₩ 829,969 ₩ 2,950,812
Payment of income tax 378,715 881,583 2,689,640
Adjustment in respect of prior years due to change in estimate (195,648) 4,484 231,113
Current income tax directly recognized in equity 101,528 (56,098) 30,059
Income tax directly adjusted to shareholders' equity (except for accumulated other comprehensive income (loss)) 4,273 5,223 (1,753)
Dividends of hybrid securities 4,273 5,248 5,253
Gain on disposal of investments in subsidiaries 0 0 (7,006)
Effect of change in effective tax rate 0 (25) 0
Income tax recognized as other comprehensive income (loss) 97,255 (61,321) 31,812
Gain on valuation of financial assets at fair value through other comprehensive income 35,798 0 0
Gain (loss) on valuation of available-for-sale financial assets 0 (2,551) (8,143)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax 6,639 (11,016) (18,335)
Remeasurements of defined benefit obligations 53,703 (80,645) 49,986
Investments in associates 6,592 8,649 7,731
Others (5,477) 24,242 573
Effect of change in accounting policy 1,780 0 0
Deferred income tax expense (benefit) (1,112,696) 1,342,855 414,329
Generation and realization of temporary differences (495,658) 1,283,012 509,762
Changes of unrecognized tax losses, tax credit and temporary differences for prior periods (28,509) 44,573 (86,845)
Changes in deferred tax on tax losses carryforwards (572,305) 0 0
Tax credit carryforwards (16,224) 15,270 (8,588)
Income tax expense (benefit) ₩ (826,321) ₩ 2,172,824 ₩ 3,365,141