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Risk Management - Summary of Fair Value Measurement of Financial Liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial liabilities [line items]    
Financial liabilities ₩ 148,155,994 ₩ 138,660,579
At fair value    
Disclosure of financial liabilities [line items]    
Financial liabilities 452,234 432,751
Financial liabilities, at fair value 452,234 432,751
At amortized cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 147,703,760 138,227,828
Financial liabilities, at fair value 145,129,539 129,887,195
Derivative liabilities | Not Designated as Hedging Instrument | At fair value    
Disclosure of financial liabilities [line items]    
Financial liabilities 428,670 407,246
Financial liabilities, at fair value 428,670 407,246
Derivative liabilities | Designated as Hedging Instrument | At fair value    
Disclosure of financial liabilities [line items]    
Financial liabilities 23,564 25,505
Financial liabilities, at fair value 23,564 25,505
Secured borrowings | At amortized cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 773,646 102,368
Financial liabilities, at fair value 773,646 102,368
Unsecured bond | At amortized cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 113,792,178 105,185,189
Financial liabilities, at fair value 111,218,771 96,846,056
Lease liabilities | At amortized cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 3,807,880 4,163,143
Financial liabilities, at fair value 3,807,880 4,163,143
Unsecured borrowings | At amortized cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 19,062,162 15,282,193
Financial liabilities, at fair value 19,061,348 15,280,693
Trade and other payables | At amortized cost    
Disclosure of financial liabilities [line items]    
Financial liabilities [1] 10,264,050 13,459,320
Financial liabilities, at fair value [1] 10,264,050 13,459,320
Bank overdraft | At amortized cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 3,844 35,615
Financial liabilities, at fair value ₩ 3,844 ₩ 35,615
[1] Excludes lease liabilities.