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Insurance contract liabilities - Disclosure of assumptions used in estimation of insurance reserves (Detail)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Annuities [Member]    
Disclosure Detail Of Assumptions Used In Estimation Of Insurance Reserves [Line Items]    
Mortality table SPP-S-2017, SPP-I-2017 with improvement factor for mortality SPP-S-2017, SPP-I-2017 with improvement factor for mortality
Annuities [Member] | S Or Vac [Member]    
Disclosure Detail Of Assumptions Used In Estimation Of Insurance Reserves [Line Items]    
Technical rates 4.78% 3.77%
Annuities [Member] | USD [Member]    
Disclosure Detail Of Assumptions Used In Estimation Of Insurance Reserves [Line Items]    
Technical rates 6.10% 3.70%
Annuities [Member] | PEN [Member]    
Disclosure Detail Of Assumptions Used In Estimation Of Insurance Reserves [Line Items]    
Technical rates 8.14% 6.84%
Retirement, disability and survival annuities    
Disclosure Detail Of Assumptions Used In Estimation Of Insurance Reserves [Line Items]    
Mortality table SPP-S-2017, SPP-I-2017 with improvement factor for mortality SPP-S-2017, SPP-I-2017 with improvement factor for mortality
Retirement, disability and survival annuities | S Or Vac [Member]    
Disclosure Detail Of Assumptions Used In Estimation Of Insurance Reserves [Line Items]    
Technical rates 4.78% 3.77%
SCTR insurance [member]    
Disclosure Detail Of Assumptions Used In Estimation Of Insurance Reserves [Line Items]    
Mortality table SPP-S-2017, SPP-I-2017 with improvement factor for mortality SPP-S-2017, SPP-I-2017 with improvement factor for mortality
SCTR insurance [member] | S Or Vac [Member]    
Disclosure Detail Of Assumptions Used In Estimation Of Insurance Reserves [Line Items]    
Technical rates 4.78% 3.77%
Life insurance contracts [member]    
Disclosure Detail Of Assumptions Used In Estimation Of Insurance Reserves [Line Items]    
Mortality table CSO 80 adjustable CSO 80 adjustable
Life insurance contracts [member] | Bottom of range [member]    
Disclosure Detail Of Assumptions Used In Estimation Of Insurance Reserves [Line Items]    
Technical rates 4.00% 4.00%
Life insurance contracts [member] | Top of range [member]    
Disclosure Detail Of Assumptions Used In Estimation Of Insurance Reserves [Line Items]    
Technical rates 5.00% 5.00%