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Employee benefits - Summary of sensitivity of provision for employee termination benefits to changes in the significant actuarial assumptions (Detail) - TRY (₺)
₺ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Interest rate    
Disclosure of sensitivity analysis for actuarial assumptions    
Percentage of reasonably possible increase in actuarial assumption 1.00% 1.00%
Percentage of reasonably possible decrease in actuarial assumption 1.00% 1.00%
Impact on provision for increase in assumption, percentage (13.10%) (14.20%)
Impact on provision for decrease in assumption, percentage 15.60% 17.20%
Impact on provision for increase in assumption ₺ (271,772) ₺ (446,533)
Impact on provision for decrease in assumption ₺ 323,636 ₺ 540,557
Inflation rate    
Disclosure of sensitivity analysis for actuarial assumptions    
Percentage of reasonably possible increase in actuarial assumption 1.00% 1.00%
Percentage of reasonably possible decrease in actuarial assumption 1.00% 1.00%
Impact on provision for increase in assumption, percentage 16.10% 6.60%
Impact on provision for decrease in assumption, percentage (13.60%) (22.70%)
Impact on provision for increase in assumption ₺ 334,009 ₺ 207,544
Impact on provision for decrease in assumption ₺ (282,145) ₺ (713,824)