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Investment Securities and derivatives - Summary of Grading of Debt Securities (Details) - KZT (₸)
₸ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of credit risk exposure [line items]    
Gross carrying amount ₸ 7,997,909 ₸ 6,553,522
Debt Securities    
Disclosure of credit risk exposure [line items]    
Gross carrying amount 1,489,205 1,376,728
A- and Higher | Debt Securities    
Disclosure of credit risk exposure [line items]    
Gross carrying amount 36,415 33,681
BBB+ to BBB- | Debt Securities    
Disclosure of credit risk exposure [line items]    
Gross carrying amount 1,373,391 1,335,500
BB+ to B- | Debt Securities    
Disclosure of credit risk exposure [line items]    
Gross carrying amount 4,957 4,037
Not Rated | Debt Securities    
Disclosure of credit risk exposure [line items]    
Gross carrying amount ₸ 74,442 ₸ 3,510