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Basis of Preparation - Additional Information (Details)
$ in Thousands, ₩ in Millions
 12 Months Ended
Jan. 01, 2022
KRW (₩)
Dec. 31, 2022
KRW (₩)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
KRW (₩)
Dec. 31, 2020
KRW (₩)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2019
KRW (₩)
Basis Of Preparation Of Financial Statements [Line Items]                
Assets   ₩ 701,170,848 [1]   ₩ 663,895,834 [1]   $ 556,405,314    
Liabilities   651,527,934 [1]   615,601,914 [1]   517,011,803    
Equity   49,642,914   48,293,920 ₩ 43,402,357 $ 39,393,510 $ 38,323,033 ₩ 39,149,975
Profit Loss   4,173,239 $ 3,311,621 4,384,381 3,515,578      
Comprehensive income   661,802 525,165 4,607,139 3,987,848      
Profit (loss), attributable to owners of parent   4,394,830 $ 3,487,462 ₩ 4,409,543 ₩ 3,468,448      
KBK B Insurance Co. Ltd. [member]                
Basis Of Preparation Of Financial Statements [Line Items]                
Insurance contract assets ₩ 1,644,590              
Insurance contract liabilities 25,847,176              
KB Prudential Life Insurance Company Of Korea Ltd [member]                
Basis Of Preparation Of Financial Statements [Line Items]                
Insurance contract assets 0              
Insurance contract liabilities 20,140,367              
KB Life Insurance Co., Ltd [member]                
Basis Of Preparation Of Financial Statements [Line Items]                
Insurance contract assets 3,854              
Insurance contract liabilities 8,459,438              
IFRS 17 [member]                
Basis Of Preparation Of Financial Statements [Line Items]                
Assets 688,608,545 688,608,545            
Liabilities 634,464,297 634,464,297            
Equity 54,144,248 54,144,248            
Profit Loss 3,900,094 3,900,094            
Comprehensive income 4,046,755 4,046,755            
Profit (loss), attributable to owners of parent 4,121,685              
Insurance contract assets 1,579,270 1,579,270            
Insurance contract liabilities ₩ 45,951,740 45,951,740            
IFRS 17 [member] | Increase (decrease) due to changes in accounting policy [member]                
Basis Of Preparation Of Financial Statements [Line Items]                
Assets   12,562,303            
Liabilities   17,063,637            
Equity   4,501,334            
Profit Loss   273,145            
Comprehensive income   3,384,953            
Profit (loss), attributable to owners of parent   ₩ 273,145            
[1] Assets and liabilities of the reporting segments are amounts before intersegment transactions.