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Statement of Cash Flows - Summary of Changes in Liabilities Incurred From Financing Activities (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance ₩ 84,940,016 ₩ 74,345,677
Cash flows 38,631,168 9,081,358
Increase 109,019 73,090
Effect of exchange rate fluctuations and others 1,088,305 1,439,891
Ending balance 124,768,508 84,940,016
Borrowings and debt securities    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 80,529,513 69,724,581
Cash flows 39,193,815 9,653,394
Increase 0 0
Effect of exchange rate fluctuations and others 882,037 1,151,538
Ending balance 120,605,365 80,529,513
Lease liabilities    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 4,410,503 4,621,096
Cash flows (562,647) (572,036)
Increase 109,019 73,090
Effect of exchange rate fluctuations and others 206,268 288,353
Ending balance ₩ 4,163,143 ₩ 4,410,503