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Financial Risk Management - Summary of Expected Credit Losses Reflect Forward-Looking Information (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of provision matrix [line items]    
Expected credit loss rate 0.00% 0.00%
Financial assets ₩ 15,486,942 ₩ 13,766,638
Less than 6 months [member]    
Disclosure of provision matrix [line items]    
Expected credit loss rate 5.43% 5.57%
7-12 months [member]    
Disclosure of provision matrix [line items]    
Expected credit loss rate 21.72% 25.84%
More than 1 years [member]    
Disclosure of provision matrix [line items]    
Expected credit loss rate 54.55% 67.16%
Carrying amounts [member]    
Disclosure of provision matrix [line items]    
Financial assets ₩ 3,770,489 ₩ 3,700,050
Carrying amounts [member] | Less than 6 months [member]    
Disclosure of provision matrix [line items]    
Financial assets 3,466,588 3,443,163
Carrying amounts [member] | 7-12 months [member]    
Disclosure of provision matrix [line items]    
Financial assets 68,772 49,491
Carrying amounts [member] | More than 1 years [member]    
Disclosure of provision matrix [line items]    
Financial assets 235,129 207,396
Provision for impairment [member]    
Disclosure of provision matrix [line items]    
Financial assets (331,290) (343,738)
Provision for impairment [member] | Less than 6 months [member]    
Disclosure of provision matrix [line items]    
Financial assets (188,086) (191,668)
Provision for impairment [member] | 7-12 months [member]    
Disclosure of provision matrix [line items]    
Financial assets (14,940) (12,789)
Provision for impairment [member] | More than 1 years [member]    
Disclosure of provision matrix [line items]    
Financial assets ₩ (128,264) ₩ (139,281)