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Changes in liabilities arising from financing activities (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	₩ 61,318,433	₩ 55,165,652
Cash flows	5,768,637	5,837,882
Disclosure - Changes in lease liabilities [Abstract]
Interest expense on lease liabilities	(85,950)
Increase	218,800	0
Changes in accounting policies	4,943,584	0
Effect of exchange rate fluctuations and others	694,320	314,899
Increase from the business combination	2,900	0
Ending balance	72,946,673	61,318,433
Borrowings and debt securities
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	61,034,627	54,747,392
Cash flows	6,342,074	5,972,336
Disclosure - Changes in lease liabilities [Abstract]
Increase	0	0
Changes in accounting policies	0	0
Effect of exchange rate fluctuations and others	496,940	314,899
Increase from the business combination	2,900	0
Ending balance	67,876,540	61,034,627
Lease liabilities
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	283,806	418,260
Cash flows	(573,437)	(134,454)
Disclosure - Changes in lease liabilities [Abstract]
Interest expense on lease liabilities	(85,950)
Decrease	659,387
Increase	218,800	0
Changes in accounting policies	4,943,584	0
Effect of exchange rate fluctuations and others	197,380	0
Increase from the business combination	0	0
Ending balance	₩ 5,070,133	₩ 283,806

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The increase (decrease) in liabilities arising from financing activities resulting from the effect of changes in foreign exchange rates. [Refer: Liabilities arising from financing activities]

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- Definition

The increase (decrease) in liabilities arising from financing activities resulting from financing cash flows. [Refer: Cash flows from (used in) financing activities; Liabilities arising from financing activities]

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- Definition

The increase (decrease) in liabilities arising from financing activities resulting from obtaining or losing control of subsidiaries or other businesses. [Refer: Liabilities arising from financing activities; Subsidiaries [member]]

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The increase in liabilities arising from financing activities resulting from new leases. [Refer: Liabilities arising from financing activities]

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The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

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The amount of liabilities for which cash flows were, or future cash flows will be, classified in the statement of cash flows as cash flows from financing activities. [Refer: Cash flows from (used in) financing activities; Liabilities]

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