v3.26.1
Investments - Summary of Investments Comprise Financial Assets Excluding Derivatives And Investments in Real Estate (Detail) - EUR (€)
€ in Millions
Jun. 30, 2026
Dec. 31, 2025
Disclosure of investments in financial assets and real estate [line items]    
Investments in real estate € 53 € 479
Financial Assets Excluding Derivatives Category [Member]    
Disclosure of investments in financial assets and real estate [line items]    
FVOCI – with recycling 52,531 49,747
FVOCI – no recycling 10 10
Amortized cost 9,522 9,719
Financial assets measured at FVPL – designated 98,187 217,880
Financial assets measured at FVPL – mandatory 6,884 7,306
Total 167,134 284,662
Investments in real estate 53 479
Total investments 167,187 285,141
Financial Assets Excluding Derivatives Category [Member] | Insurance Contract With Direct Participation [Member]    
Disclosure of investments in financial assets and real estate [line items]    
Financial assets measured at FVPL – designated 69,258 109,580
Total 69,258 109,580
Investments in real estate   217
Total investments 69,258 109,798
Financial Assets Excluding Derivatives Category [Member] | Insurance Contract Without Direct Participation [Member]    
Disclosure of investments in financial assets and real estate [line items]    
FVOCI – with recycling 43,497 41,100
FVOCI – no recycling 9 9
Amortized cost 7,170 7,443
Financial assets measured at FVPL – designated 641 1,637
Financial assets measured at FVPL – mandatory 5,778 6,207
Total 57,095 56,397
Investments in real estate 53 42
Total investments 57,148 56,439
Financial Assets Excluding Derivatives Category [Member] | Investment Contracts With DPF With Direct Participation [Member]    
Disclosure of investments in financial assets and real estate [line items]    
Financial assets measured at FVPL – designated   21,441
Total   21,441
Investments in real estate   132
Total investments   21,573
Financial Assets Excluding Derivatives Category [Member] | Non Insurance Related Investment [member]    
Disclosure of investments in financial assets and real estate [line items]    
FVOCI – with recycling 9,033 8,647
FVOCI – no recycling 1 1
Amortized cost 2,352 2,276
Financial assets measured at FVPL – designated 28,287 85,222
Financial assets measured at FVPL – mandatory 1,107 1,098
Total 40,781 97,244
Investments in real estate   87
Total investments € 40,781 € 97,331