| Line Item | Dec 31, 2025 | Dec 31, 2024 | Dec 31, 2023 | Dec 31, 2022 | Dec 31, 2021 | Dec 31, 2020 | Dec 31, 2019 | Dec 31, 2018 | Dec 31, 2017 |
|---|---|---|---|---|---|---|---|---|---|
| Profit or loss [abstract] | |||||||||
| Interest and similar income | |||||||||
| Interest and similar expenses | |||||||||
| Net interest and similar income | |||||||||
| Impairment loss on loans, net of recoveries | |||||||||
| Loss due to impairment of financial investments | |||||||||
| Net interest and similar income after impairment loss | |||||||||
| Fee income from financial services, net | |||||||||
| Net gain on foreign exchange transactions | |||||||||
| Net gain (loss) on sale of financial investments | |||||||||
| Net gain on financial assets at fair value through profit or loss | |||||||||
| Net gain on investment property | |||||||||
| Other income | |||||||||
| Other operating income | |||||||||
| Result from insurance activities | |||||||||
| Other expenses | |||||||||
| Salaries and employee benefits | |||||||||
| Administrative expenses | |||||||||
| Depreciation and amortization | |||||||||
| Other expenses | |||||||||
| Operating expense | |||||||||
| Income before exchange difference and Income Tax | |||||||||
| Exchange difference | |||||||||
| Income Tax | |||||||||
| Net profit for the year | |||||||||
| Attributable to: | |||||||||
| IFS's shareholders | |||||||||
| Non-controlling interest | |||||||||
| Net profit for the year | |||||||||
| Earnings per share attributable to IFS's shareholders, basic (stated in Soles) | |||||||||
| Earnings per share attributable to IFS's shareholders, diluted (stated in Soles) |