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Capital risk management (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Capital risk management [Abstract]        
Total borrowings and debt securities ₩ 61,034,627 ₩ 54,747,392    
Cash and cash equivalents 1,358,345 2,369,739 ₩ 3,051,353 ₩ 3,783,065
Net borrowings and debt securities 59,676,282 52,377,653    
Total shareholder's equity ₩ 71,092,762 ₩ 72,964,641 ₩ 73,050,545 ₩ 67,942,475
Debt to equity ratio 83.94% 71.78%