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Changes in liabilities incurred from financing activities (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	₩ 72,946,674	₩ 61,318,433
Cash flows	1,924,810	5,768,637
Increase	275,686	218,800
Changes in accounting policies	0	4,943,584
Effect of exchange rate fluctuations and others	(801,493)	694,320
Increase from the business combination	0	2,900
Ending balance	74,345,677	72,946,674
Borrowings and debt securities
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	67,876,541	61,034,627
Cash flows	2,538,787	6,342,074
Increase	0	0
Changes in accounting policies	0	0
Effect of exchange rate fluctuations and others	(690,747)	496,940
Effect of exchange rate fluctuations	(640,304)	494,414
Others	(50,443)	2,526
Increase from the business combination	0	2,900
Ending balance	69,724,581	67,876,541
Lease liabilities
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	5,070,133	283,806
Cash flows	(613,977)	(573,437)
Increase	275,686	218,800
Changes in accounting policies	0	4,943,584
Effect of exchange rate fluctuations and others	(110,746)	197,380
Increase from the business combination	0	0
Ending balance	₩ 4,621,096	₩ 5,070,133

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- Definition

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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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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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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 (decrease) in liabilities arising from financing activities resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Liabilities arising from financing activities]

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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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