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Income Taxes - Summary of Changes in Deferred Income Tax Assets (Liabilities) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance ₩ (7,367,101) ₩ (7,126,946)  
Amounts recognized in profit or loss 2,366,869 (291,641)  
Amount recognized in other comprehensive income (loss) (203,450) 47,213 ₩ (56,733)
Amounts recognized directly in equity 4,736 4,273  
Ending balance (5,198,946) (7,367,101) (7,126,946)
Deferred income tax on temporary differences      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance (8,400,772) (8,382,980)  
Amounts recognized in profit or loss 636,788 (69,278)  
Amount recognized in other comprehensive income (loss) (203,450) 47,213  
Amounts recognized directly in equity 4,736 4,273  
Ending balance (7,962,698) (8,400,772) (8,382,980)
Employee benefits      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance 689,787 648,847  
Amounts recognized in profit or loss (4,514) 14,566  
Amount recognized in other comprehensive income (loss) (126,890) 26,374  
Ending balance 558,383 689,787 648,847
Cash flow hedges      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance 15,587 (999)  
Amounts recognized in profit or loss (90,217) 63,817  
Amount recognized in other comprehensive income (loss) 24,220 (47,231)  
Amounts recognized directly in equity 463    
Ending balance (49,947) 15,587 (999)
Investments in subsidiaries, associates and joint ventures      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance (8,668,015) (8,665,727)  
Amounts recognized in profit or loss 367 (38,002)  
Amount recognized in other comprehensive income (loss) (53,672) 35,714  
Ending balance (8,721,320) (8,668,015) (8,665,727)
Property, plant and equipment      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance (7,713,449) (7,115,218)  
Amounts recognized in profit or loss 282,988 (598,231)  
Ending balance (7,430,461) (7,713,449) (7,115,218)
Finance lease      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance (211,420) (160,443)  
Amounts recognized in profit or loss (204,138) (50,977)  
Ending balance (415,558) (211,420) (160,443)
Intangible Assets      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance (31,166) (55,906)  
Amounts recognized in profit or loss (315) 24,740  
Ending balance (31,481) (31,166) (55,906)
Financial assets at fair value through profit or loss      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance 13 341  
Amounts recognized in profit or loss (1) (328)  
Ending balance 12 13 341
Financial assets at fair value through other comprehensive income      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance 37,950 18,245  
Amounts recognized in profit or loss (816) 258  
Amount recognized in other comprehensive income (loss) (9,753) 19,447  
Ending balance 27,381 37,950 18,245
Deferred revenue      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance 199,701 213,003  
Amounts recognized in profit or loss (13,310) (13,302)  
Ending balance 186,391 199,701 213,003
Provisions      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance 5,916,803 5,456,919  
Amounts recognized in profit or loss 577,511 459,884  
Ending balance 6,494,314 5,916,803 5,456,919
Doubtful receivables      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance 0 59  
Amounts recognized in profit or loss 801 (59)  
Ending balance 801 0 59
Other financial liabilities      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance 30,399 39,364  
Amounts recognized in profit or loss (3,262) (13,238)  
Amounts recognized directly in equity 4,273 4,273  
Ending balance 31,410 30,399 39,364
Gains or losses on foreign exchange translation      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance (11,635) 57,961  
Amounts recognized in profit or loss 103,046 (69,596)  
Ending balance 91,411 (11,635) 57,961
Allowance for doubtful accounts      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance 56,129 57,607  
Amounts recognized in profit or loss 8,135 (1,478)  
Ending balance 64,264 56,129 57,607
Accrued income      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance 8,944 (4,376)  
Amounts recognized in profit or loss 1,058 13,320  
Ending balance 10,002 8,944 (4,376)
Special deduction for property, plant and equipment      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance (226,351) (215,373)  
Amounts recognized in profit or loss 2,224 (10,978)  
Ending balance (224,127) (226,351) (215,373)
Others      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance 1,505,951 1,342,716  
Amounts recognized in profit or loss (22,769) 150,326  
Amount recognized in other comprehensive income (loss) (37,355) 12,909  
Ending balance 1,445,827 1,505,951 1,342,716
Deferred income tax on unused tax losses and tax credit      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance 1,033,671 1,256,034  
Amounts recognized in profit or loss 1,730,081 (222,363)  
Ending balance 2,763,752 1,033,671 1,256,034
Unused tax losses      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance 893,074 1,111,813  
Amounts recognized in profit or loss 1,666,803 (218,739)  
Ending balance 2,559,877 893,074 1,111,813
Excess of donation limit      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance 35,181 36,695  
Amounts recognized in profit or loss 34,004 (1,514)  
Ending balance 69,185 35,181 36,695
Tax credit      
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]      
Beginning balance 105,416 107,526  
Amounts recognized in profit or loss 29,274 (2,110)  
Ending balance ₩ 134,690 ₩ 105,416 ₩ 107,526