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Risk Management Policy - Schedule of Internal Rating Model to Classify Individually Significant Loans to Customers in Different Risk Categories (Details) - KZT (₸)
₸ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of internal credit grades [line items]      
Carrying Amount ₸ 7,997,909 ₸ 6,553,522  
Investment Debt Securities      
Disclosure of internal credit grades [line items]      
Carrying Amount 1,489,205 1,376,728  
Investment Debt Securities | High Grade (A- and Higher)      
Disclosure of internal credit grades [line items]      
Carrying Amount 36,415 33,681  
Investment Debt Securities | Investment grade (BBB+ - BBB-)      
Disclosure of internal credit grades [line items]      
Carrying Amount 1,373,391 1,335,500  
Investment Debt Securities | Non-Investment grade (BB+ - B-)      
Disclosure of internal credit grades [line items]      
Carrying Amount 4,957 4,037  
Investment Debt Securities | Not Rated      
Disclosure of internal credit grades [line items]      
Carrying Amount 74,442 3,510  
Investment Debt Securities | Stage 1 - 12-month ECL      
Disclosure of internal credit grades [line items]      
Carrying Amount 1,485,377 1,373,218  
Investment Debt Securities | Stage 1 - 12-month ECL | High Grade (A- and Higher)      
Disclosure of internal credit grades [line items]      
Carrying Amount 36,415 33,681  
Investment Debt Securities | Stage 1 - 12-month ECL | Investment grade (BBB+ - BBB-)      
Disclosure of internal credit grades [line items]      
Carrying Amount 1,373,391 1,335,500  
Investment Debt Securities | Stage 1 - 12-month ECL | Non-Investment grade (BB+ - B-)      
Disclosure of internal credit grades [line items]      
Carrying Amount 4,957 4,037  
Investment Debt Securities | Stage 1 - 12-month ECL | Not Rated      
Disclosure of internal credit grades [line items]      
Carrying Amount 70,614    
Investment Debt Securities | Stage 2 - Lifetime ECL      
Disclosure of internal credit grades [line items]      
Carrying Amount 567 2,322  
Investment Debt Securities | Stage 2 - Lifetime ECL | Not Rated      
Disclosure of internal credit grades [line items]      
Carrying Amount 567 2,322  
Investment Debt Securities | Stage 3 - Lifetime ECL      
Disclosure of internal credit grades [line items]      
Carrying Amount 3,261 1,188  
Investment Debt Securities | Stage 3 - Lifetime ECL | Not Rated      
Disclosure of internal credit grades [line items]      
Carrying Amount 3,261 1,188  
Loans to Customers | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 6,042,443 4,478,489 ₸ 3,369,512
Loans to Customers | POCI | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 23,136 10,504 4,754
Loans to Customers | Stage 1 - 12-month ECL | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 5,447,804 4,048,478 3,058,897
Loans to Customers | Stage 2 - Lifetime ECL | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 86,251 55,804 40,934
Loans to Customers | Stage 3 - Lifetime ECL | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 485,252 363,703 ₸ 264,927
Due from Banks      
Disclosure of internal credit grades [line items]      
Carrying Amount 37,908 30,683  
Due from Banks | Not Rated      
Disclosure of internal credit grades [line items]      
Carrying Amount 123    
Due from Banks | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 37,915 30,689  
Due from Banks | Gross Carrying | High Grade (A- and Higher)      
Disclosure of internal credit grades [line items]      
Carrying Amount 36,464 29,652  
Due from Banks | Gross Carrying | Investment grade (BBB+ - BBB-)      
Disclosure of internal credit grades [line items]      
Carrying Amount 1,328 1,031  
Due from Banks | Gross Carrying | Investment Grade (BB+ - B-)      
Disclosure of internal credit grades [line items]      
Carrying Amount   6  
Due from Banks | Gross Carrying | Investment grade (Not rated)      
Disclosure of internal credit grades [line items]      
Carrying Amount 123    
Due from Banks | Allowance for Impairment Losses      
Disclosure of internal credit grades [line items]      
Carrying Amount (7) (6)  
Due from Banks | Stage 1 - 12-month ECL      
Disclosure of internal credit grades [line items]      
Carrying Amount 37,908 30,683  
Due from Banks | Stage 1 - 12-month ECL | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 37,915 30,689  
Due from Banks | Stage 1 - 12-month ECL | Gross Carrying | High Grade (A- and Higher)      
Disclosure of internal credit grades [line items]      
Carrying Amount 36,464 29,652  
Due from Banks | Stage 1 - 12-month ECL | Gross Carrying | Investment grade (BBB+ - BBB-)      
Disclosure of internal credit grades [line items]      
Carrying Amount 1,328 1,031  
Due from Banks | Stage 1 - 12-month ECL | Gross Carrying | Investment Grade (BB+ - B-)      
Disclosure of internal credit grades [line items]      
Carrying Amount   6  
Due from Banks | Stage 1 - 12-month ECL | Gross Carrying | Investment grade (Not rated)      
Disclosure of internal credit grades [line items]      
Carrying Amount 123    
Due from Banks | Stage 1 - 12-month ECL | Allowance for Impairment Losses      
Disclosure of internal credit grades [line items]      
Carrying Amount (7) (6)  
Internal Rating Model | Loans to Customers      
Disclosure of internal credit grades [line items]      
Carrying Amount 5,746,600 4,235,957  
Internal Rating Model | Loans to Customers | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 6,042,443 4,478,489  
Internal Rating Model | Loans to Customers | Allowance for Impairment Losses      
Disclosure of internal credit grades [line items]      
Carrying Amount 295,843 (242,532)  
Internal Rating Model | Loans to Customers | POCI      
Disclosure of internal credit grades [line items]      
Carrying Amount 20,951 10,243  
Internal Rating Model | Loans to Customers | POCI | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 23,136 10,504  
Internal Rating Model | Loans to Customers | POCI | Allowance for Impairment Losses      
Disclosure of internal credit grades [line items]      
Carrying Amount (2,185) (261)  
Internal Rating Model | Loans to Customers | Loans to Customers that are Individually Assessed for Impairment | Gross Carrying | Grades: Low to Fair Risk      
Disclosure of internal credit grades [line items]      
Carrying Amount 5,120 5,669  
Internal Rating Model | Loans to Customers | Loans to Customers that are Individually Assessed for Impairment | Gross Carrying | Grade: Impaired      
Disclosure of internal credit grades [line items]      
Carrying Amount 5,260 6,718  
Internal Rating Model | Loans to Customers | Loans to Customers that are Collectively Assessed for Impairment | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 6,032,063 4,466,102  
Internal Rating Model | Loans to Customers | Loans to Customers that are Collectively Assessed for Impairment | POCI | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 23,136 10,504  
Internal Rating Model | Loans to Customers | Stage 1 - 12-month ECL      
Disclosure of internal credit grades [line items]      
Carrying Amount 5,370,283 3,988,539  
Internal Rating Model | Loans to Customers | Stage 1 - 12-month ECL | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 5,447,804 4,048,478  
Internal Rating Model | Loans to Customers | Stage 1 - 12-month ECL | Allowance for Impairment Losses      
Disclosure of internal credit grades [line items]      
Carrying Amount (77,521) (59,939)  
Internal Rating Model | Loans to Customers | Stage 1 - 12-month ECL | Loans to Customers that are Individually Assessed for Impairment | Gross Carrying | Grades: Low to Fair Risk      
Disclosure of internal credit grades [line items]      
Carrying Amount 5,120 5,669  
Internal Rating Model | Loans to Customers | Stage 1 - 12-month ECL | Loans to Customers that are Collectively Assessed for Impairment | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 5,442,684 4,042,809  
Internal Rating Model | Loans to Customers | Stage 2 - Lifetime ECL      
Disclosure of internal credit grades [line items]      
Carrying Amount 63,873 39,514  
Internal Rating Model | Loans to Customers | Stage 2 - Lifetime ECL | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 86,251 55,804  
Internal Rating Model | Loans to Customers | Stage 2 - Lifetime ECL | Allowance for Impairment Losses      
Disclosure of internal credit grades [line items]      
Carrying Amount (22,378) (16,290)  
Internal Rating Model | Loans to Customers | Stage 2 - Lifetime ECL | Loans to Customers that are Collectively Assessed for Impairment | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 86,251 55,804  
Internal Rating Model | Loans to Customers | Stage 3 - Lifetime ECL      
Disclosure of internal credit grades [line items]      
Carrying Amount 291,493 197,661  
Internal Rating Model | Loans to Customers | Stage 3 - Lifetime ECL | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount 485,252 363,703  
Internal Rating Model | Loans to Customers | Stage 3 - Lifetime ECL | Allowance for Impairment Losses      
Disclosure of internal credit grades [line items]      
Carrying Amount (193,759) (166,042)  
Internal Rating Model | Loans to Customers | Stage 3 - Lifetime ECL | Loans to Customers that are Individually Assessed for Impairment | Gross Carrying | Grade: Impaired      
Disclosure of internal credit grades [line items]      
Carrying Amount 5,260 6,718  
Internal Rating Model | Loans to Customers | Stage 3 - Lifetime ECL | Loans to Customers that are Collectively Assessed for Impairment | Gross Carrying      
Disclosure of internal credit grades [line items]      
Carrying Amount ₸ 479,992 ₸ 356,985