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Income tax expense (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income tax expense [Abstract]      
Current income tax expense ₩ 829,969 ₩ 2,950,812 ₩ 2,697,299
Payment of income tax 881,583 2,689,640 2,682,779
Adjustment due to changes in estimates related to prior years 4,484 231,113 (23,248)
Current income tax directly recognized in equity (56,098) 30,059 37,768
Income tax directly adjusted to shareholders’ equity (except for accumulated other comprehensive income (loss)) 5,223 (1,753) (8,891)
Dividends of hybrid securities 5,248 5,253 5,253
Gain on disposal of investments in subsidiaries   (7,006) (14,144)
Effect of change in effective tax rate (25)    
Income tax recognized as other comprehensive income (loss) (61,321) 31,812 46,659
Gain (loss) on valuation of available-for-sale financial assets (2,551) (8,143) (6,315)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (11,016) (18,335) 7,253
Remeasurements of defined benefit obligations (80,645) 49,986 42,913
Investments in associates 8,649 7,731 13,648
Others 24,242 573 (10,840)
Deferred income tax expense 1,342,855 414,329 2,542,114
Generation and realization of temporary differences 1,283,012 509,762 48,878
Changes of unrecognized tax losses, tax credit and temporary differences for prior periods 44,573 (86,845) 71,999
Changes in deferred tax on tax losses carryforwards     2,374,237
Tax credit carryforwards 15,270 (8,588) 47,000
Income tax expense ₩ 2,172,824 ₩ 3,365,141 ₩ 5,239,413