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Information About Non-controlling Interests - Summary of Financial Information on Subsidiaries (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of subsidiaries [line items]        
Current assets ₩ 14,594,246 ₩ 12,690,014    
Non-current assets 28,197,401 28,299,796    
Current liabilities 13,247,637 10,699,268    
Non-current liabilities 11,001,436 11,877,846    
Equity 18,542,575 18,412,696 ₩ 16,567,161 ₩ 15,551,433
KT Skylife Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Current assets 425,661 420,701    
Non-current assets 795,182 938,465    
Current liabilities 353,839 274,637    
Non-current liabilities 125,531 229,042    
Equity 741,473 855,487    
BC Card Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Current assets 3,739,847 3,152,622    
Non-current assets 2,613,031 2,513,453    
Current liabilities 3,661,263 2,879,551    
Non-current liabilities 1,061,169 1,229,649    
Equity 1,630,446 1,556,875    
KTIS Corporation [Member]        
Disclosure of subsidiaries [line items]        
Current assets 111,313 102,121    
Non-current assets 336,296 294,087    
Current liabilities 116,271 103,698    
Non-current liabilities 127,248 95,506    
Equity 204,090 197,004    
KTCS Corporation [Member]        
Disclosure of subsidiaries [line items]        
Current assets 304,508 296,209    
Non-current assets 130,391 123,517    
Current liabilities 187,621 188,379    
Non-current liabilities 47,228 40,240    
Equity 200,050 191,107    
Nasmedia, Co., Ltd. [Member]        
Disclosure of subsidiaries [line items]        
Current assets 411,774 435,359    
Non-current assets 101,537 81,586    
Current liabilities 251,207 261,381    
Non-current liabilities 11,129 14,349    
Equity ₩ 250,975 ₩ 241,215