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Financial Instruments - Summary of Carrying Amount and Fair Values of Financial Assets and Financial Liabilities by Fair value (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Short-term financial instruments ₩ 491,841 ₩ 1,212,643
Cash and cash equivalents 7,049,800 6,767,898
Other receivables 1,920,685 2,261,323
Borrowings 28,492,000 25,997,367
Financial guarantee liabilities 18,135  
Other financial liabilities book value 2,734,725  
Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Financial assets 31,867,194 30,556,986
Liabilities measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Financial liabilities 37,831,991 36,247,865
Financial assets at fair value through profit or loss [member] | Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Derivative assets 656,181 946,393
Short-term financial instruments 491,841 1,212,643
Equity securities 95,230 52,222
Debt securities 137,647 113,728
Other securities 696,148 762,177
Derivative hedging instruments 6,392 16,483
Financial assets at fair value through other comprehensive income [member] | Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Equity securities 1,626,209 1,119,322
Assets held for sale 7,276 604,439
Financial assets at financial assets measured at amortized cost [member] | Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Debt securities 962,120 402,644
Assets held for sale 2,238  
Cash and cash equivalents 7,049,800 6,767,898
Trade accounts and notes receivable 9,633,285 9,374,086
Other receivables 3,335,169 2,739,523
Deposit instruments 7,167,658 6,445,428
Financial liabilities at fair value through profit or loss [Member] | Liabilities measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Derivative liabilities 41,131 105,187
Borrowings 44,509 39,053
Derivative hedging instruments 16,443 5,835
Financial liabilities measured at amortized cost [member] | Liabilities measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Trade accounts and notes payable 5,106,921 6,161,177
Borrowings 28,447,491 25,958,314
Financial guarantee liabilities 18,135 13,916
Other payables 4,075,379 3,895,526
Other financial liabilities book value 81,982 68,857
Fair value [member] | Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Financial assets 3,716,924 4,827,407
Fair value [member] | Liabilities measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Financial liabilities 28,748,013 26,317,069
Fair value [member] | Financial assets at fair value through profit or loss [member] | Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Derivative assets 656,181 946,393
Short-term financial instruments 491,841 1,212,643
Equity securities 95,230 52,222
Debt securities 137,647 113,728
Other securities 696,148 762,177
Derivative hedging instruments 6,392 16,483
Fair value [member] | Financial assets at fair value through other comprehensive income [member] | Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Equity securities 1,626,209 1,119,322
Assets held for sale 7,276 604,439
Fair value [member] | Financial liabilities at fair value through profit or loss [Member] | Liabilities measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Derivative liabilities 41,129 105,187
Borrowings 44,509 39,053
Derivative hedging instruments 16,443 5,835
Fair value [member] | Financial liabilities measured at amortized cost [member] | Liabilities measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Borrowings 28,645,932 26,166,994
Level 1 [member] | Fair value [member] | Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Financial assets 1,175,562 1,334,412
Level 1 [member] | Fair value [member] | Liabilities measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Financial liabilities 44,509 39,053
Level 1 [member] | Fair value [member] | Financial assets at fair value through profit or loss [member] | Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Equity securities 16,695 26,792
Level 1 [member] | Fair value [member] | Financial assets at fair value through other comprehensive income [member] | Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Equity securities 1,158,867 703,181
Assets held for sale   604,439
Level 1 [member] | Fair value [member] | Financial liabilities at fair value through profit or loss [Member] | Liabilities measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Borrowings 44,509 39,053
Level 2 [member] | Fair value [member] | Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Financial assets 1,282,071 2,258,218
Level 2 [member] | Fair value [member] | Liabilities measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Financial liabilities 28,703,504 26,278,016
Level 2 [member] | Fair value [member] | Financial assets at fair value through profit or loss [member] | Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Derivative assets 656,181 946,393
Short-term financial instruments 491,841 1,212,643
Debt securities 91,699 82,699
Derivative hedging instruments 6,392 16,483
Level 2 [member] | Fair value [member] | Financial assets at fair value through other comprehensive income [member] | Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Equity securities 28,682  
Assets held for sale 7,276  
Level 2 [member] | Fair value [member] | Financial liabilities at fair value through profit or loss [Member] | Liabilities measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Derivative liabilities 41,129 105,187
Derivative hedging instruments 16,443 5,835
Level 2 [member] | Fair value [member] | Financial liabilities measured at amortized cost [member] | Liabilities measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Borrowings 28,645,932 26,166,994
Level 3 [member] | Fair value [member] | Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Financial assets 1,259,291 1,234,777
Level 3 [member] | Fair value [member] | Financial assets at fair value through profit or loss [member] | Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Equity securities 78,535 25,430
Debt securities 45,948 31,029
Other securities 696,148 762,177
Level 3 [member] | Fair value [member] | Financial assets at fair value through other comprehensive income [member] | Assets measured at fair value [member]    
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Equity securities ₩ 438,660 ₩ 416,141