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Risk Management Policy - Significant Changes in Gross Carrying Amount of Loans to Customers (Details) - KZT (₸)
₸ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Gross carrying amount ₸ 6,553,522    
Changes in the gross carrying amount      
Transfers (41,013) ₸ (35,883) ₸ (25,204)
New loans to customers originated or purchased 86,237 75,105 65,898
Gross carrying amount 7,997,909 6,553,522  
Loans to Customers at Amortized Cost      
Changes in the gross carrying amount      
Transfers (1,924) (261)  
Loans to Customers at Amortized Cost | Gross Carrying      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Gross carrying amount 4,478,489 3,369,512  
Changes in the gross carrying amount      
New loans to customers originated or purchased 4,528,651 3,422,622  
Loans to customers that have been repaid or derecognized (2,891,562) (2,250,527)  
Write-offs (89,272) (82,959)  
Recovery from off-balance loans to customers 16,137 19,844  
Other changes   (3)  
Gross carrying amount 6,042,443 4,478,489 3,369,512
Loans to Customers at Amortized Cost | POCI | Gross Carrying      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Gross carrying amount 10,504 4,754  
Changes in the gross carrying amount      
New loans to customers originated or purchased 21,310 9,553  
Loans to customers that have been repaid or derecognized (8,678) (3,803)  
Gross carrying amount 23,136 10,504 4,754
Loans to Customers at Amortized Cost | Stage 1 - 12-month ECL      
Changes in the gross carrying amount      
Transfers 27,598 25,885 14,545
New loans to customers originated or purchased 86,095 75,077 65,888
Loans to Customers at Amortized Cost | Stage 1 - 12-month ECL | Transfer to Stage 1      
Changes in the gross carrying amount      
Transfers (27,424) (15,923) (3,544)
Loans to Customers at Amortized Cost | Stage 1 - 12-month ECL | Transfer to Stage 2      
Changes in the gross carrying amount      
Transfers 11,051 10,396 6,970
Loans to Customers at Amortized Cost | Stage 1 - 12-month ECL | Transfer to Stage 3      
Changes in the gross carrying amount      
Transfers 25,149 25,126 13,854
Loans to Customers at Amortized Cost | Stage 1 - 12-month ECL | Gross Carrying      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Gross carrying amount 4,048,478 3,058,897  
Changes in the gross carrying amount      
New loans to customers originated or purchased 4,507,341 3,413,069  
Loans to customers that have been repaid or derecognized (2,830,265) (2,203,671)  
Gross carrying amount 5,447,804 4,048,478 3,058,897
Loans to Customers at Amortized Cost | Stage 1 - 12-month ECL | Gross Carrying | Transfer to Stage 1      
Changes in the gross carrying amount      
Transfers 65,305 32,712  
Loans to Customers at Amortized Cost | Stage 1 - 12-month ECL | Gross Carrying | Transfer to Stage 2      
Changes in the gross carrying amount      
Transfers (76,678) (58,058)  
Loans to Customers at Amortized Cost | Stage 1 - 12-month ECL | Gross Carrying | Transfer to Stage 3      
Changes in the gross carrying amount      
Transfers (266,377) (194,471)  
Loans to Customers at Amortized Cost | Stage 2 - Lifetime ECL      
Changes in the gross carrying amount      
Transfers 1,896 2,531 (4,429)
Loans to Customers at Amortized Cost | Stage 2 - Lifetime ECL | Transfer to Stage 1      
Changes in the gross carrying amount      
Transfers 3,919 1,448 1,138
Loans to Customers at Amortized Cost | Stage 2 - Lifetime ECL | Transfer to Stage 2      
Changes in the gross carrying amount      
Transfers (20,608) (16,184) (7,208)
Loans to Customers at Amortized Cost | Stage 2 - Lifetime ECL | Transfer to Stage 3      
Changes in the gross carrying amount      
Transfers 7,250 5,745 7,014
Loans to Customers at Amortized Cost | Stage 2 - Lifetime ECL | Gross Carrying      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Gross carrying amount 55,804 40,934  
Changes in the gross carrying amount      
Loans to customers that have been repaid or derecognized (33,883) (27,748)  
Gross carrying amount 86,251 55,804 40,934
Loans to Customers at Amortized Cost | Stage 2 - Lifetime ECL | Gross Carrying | Transfer to Stage 1      
Changes in the gross carrying amount      
Transfers (13,657) (4,991)  
Loans to Customers at Amortized Cost | Stage 2 - Lifetime ECL | Gross Carrying | Transfer to Stage 2      
Changes in the gross carrying amount      
Transfers 102,681 66,931  
Loans to Customers at Amortized Cost | Stage 2 - Lifetime ECL | Gross Carrying | Transfer to Stage 3      
Changes in the gross carrying amount      
Transfers (24,694) (19,322)  
Loans to Customers at Amortized Cost | Stage 3 - Lifetime ECL      
Changes in the gross carrying amount      
Transfers (65,061) (61,320) (33,307)
Loans to Customers at Amortized Cost | Stage 3 - Lifetime ECL | Transfer to Stage 1      
Changes in the gross carrying amount      
Transfers 23,505 14,475 2,406
Loans to Customers at Amortized Cost | Stage 3 - Lifetime ECL | Transfer to Stage 2      
Changes in the gross carrying amount      
Transfers 9,557 5,788 238
Loans to Customers at Amortized Cost | Stage 3 - Lifetime ECL | Transfer to Stage 3      
Changes in the gross carrying amount      
Transfers (32,399) (30,871) (20,868)
Loans to Customers at Amortized Cost | Stage 3 - Lifetime ECL | Gross Carrying      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Gross carrying amount 363,703 264,927  
Changes in the gross carrying amount      
Loans to customers that have been repaid or derecognized (18,736) (15,305)  
Write-offs (89,272) (82,959)  
Recovery from off-balance loans to customers 16,137 19,844  
Other changes   (3)  
Gross carrying amount 485,252 363,703 ₸ 264,927
Loans to Customers at Amortized Cost | Stage 3 - Lifetime ECL | Gross Carrying | Transfer to Stage 1      
Changes in the gross carrying amount      
Transfers (51,648) (27,721)  
Loans to Customers at Amortized Cost | Stage 3 - Lifetime ECL | Gross Carrying | Transfer to Stage 2      
Changes in the gross carrying amount      
Transfers (26,003) (8,873)  
Loans to Customers at Amortized Cost | Stage 3 - Lifetime ECL | Gross Carrying | Transfer to Stage 3      
Changes in the gross carrying amount      
Transfers ₸ 291,071 ₸ 213,793