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Capital risk management (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Capital risk management [Abstract]        
Total borrowings and debt securities ₩ 54,747,392 ₩ 53,639,205    
Cash and cash equivalents 2,369,739 3,051,353 ₩ 3,783,065 ₩ 1,796,300
Net borrowings and debt securities 52,377,653 50,587,852    
Total shareholder’s equity ₩ 72,964,641 ₩ 73,050,545 ₩ 67,942,475 ₩ 54,825,010
Debt to equity ratio 71.78% 69.25%