v3.26.1
Insurance Net Investment Result - Summary of Financial Transactions Results (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL € 10,064 € 7,666 € 7,043
Net fair value change of derivatives      
Bifurcated embedded derivatives 0 3 5
Total 43 (35) 0
Realised gains and (losses) on financial investments      
Debt securities and money market investments (28) (11) (113)
Realised gains and (losses) on financial investments comprised of:      
Investments measured at amortized cost 69,293 76,020  
Other      
Gains / (losses) on investments in real estate 2 1 (6)
Total 3 0 (4)
Represented by:      
Assets mandatorily measured at FVPL (17) 14 3
Other 18 (47) (117)
Income Or Loss From Insurance And Investment Contracts [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 17,010 12,159 15,447
Net fair value change of derivatives      
Economic hedges where no hedge accounting is applied 33 (311) (114)
Bifurcated embedded derivatives     (1)
Change in fair value of hedges on guarantees in products with DPF 213 (1,297) (1,085)
Ineffective portion of hedge transactions to which hedge accounting is applied (2)   3
Total 244 (1,608) (1,197)
Realised gains and (losses) on financial investments      
Debt securities and money market investments 5 3 (16)
Realised gains and (losses) on financial investments comprised of:      
Investments measured at FVOCI (2) (1)  
Investments measured at amortized cost 7 4 (15)
Other      
Gains / (losses) on investments in real estate 7 8 (46)
Net fair value change on investments in real estate 9 1 2
Total 15 9 (44)
For the year ended December 31 17,275 10,563 14,190
Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts With Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 13,179 11,651 12,655
Net fair value change of derivatives      
Economic hedges where no hedge accounting is applied (1) (167) (95)
Change in fair value of hedges on guarantees in products with DPF 213 (1,297) (1,085)
Total 212 (1,464) (1,181)
Other      
Gains / (losses) on investments in real estate 4 5 (28)
Net fair value change on investments in real estate 0    
Total 4 5 (28)
For the year ended December 31 13,395 10,192 11,446
Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts Without Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 1,459 (1,240) 1,404
Net fair value change of derivatives      
Economic hedges where no hedge accounting is applied 41 (17) 29
Bifurcated embedded derivatives     (1)
Ineffective portion of hedge transactions to which hedge accounting is applied (2)   3
Total 39 (17) 31
Realised gains and (losses) on financial investments      
Debt securities and money market investments 5 3 (16)
Realised gains and (losses) on financial investments comprised of:      
Investments measured at FVOCI (2) (1)  
Investments measured at amortized cost 7 4 (15)
Other      
Net fair value change on investments in real estate 9 1 2
Total 9 1 2
For the year ended December 31 1,512 (1,253) 1,421
Income Or Loss From Insurance And Investment Contracts [Member] | Investment Contracts With Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 2,371 1,748 1,388
Net fair value change of derivatives      
Economic hedges where no hedge accounting is applied (7) (127) (48)
Total (7) (127) (48)
Other      
Gains / (losses) on investments in real estate 3 3 (18)
Total 3 3 (18)
For the year ended December 31 2,367 1,624 1,322
Shares [member] | Income Or Loss From Insurance And Investment Contracts [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 1,565 1,632 1,225
Shares [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts With Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 1,010 996 800
Shares [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts Without Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 12 (4) 13
Shares [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Investment Contracts With Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 542 639 413
Debt Securities And Money Market Investments [member]      
Realised gains and (losses) on financial investments      
Debt securities and money market investments (28) (11) (113)
Debt Securities And Money Market Investments [member] | Income Or Loss From Insurance And Investment Contracts [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 1,507 (1,416) 1,457
Realised gains and (losses) on financial investments      
Debt securities and money market investments (2) (1)  
Debt Securities And Money Market Investments [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts With Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 95 (164) 55
Debt Securities And Money Market Investments [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts Without Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 1,358 (1,145) 1,366
Realised gains and (losses) on financial investments      
Debt securities and money market investments (2) (1)  
Debt Securities And Money Market Investments [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Investment Contracts With Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 54 (107) 36
Unconsolidated Investment Funds [member] | Income Or Loss From Insurance And Investment Contracts [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 13,849 12,034 12,750
Unconsolidated Investment Funds [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts With Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 12,074 10,819 11,800
Unconsolidated Investment Funds [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts Without Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL   0 11
Unconsolidated Investment Funds [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Investment Contracts With Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 1,775 1,215 939
Loan [Member] | Income Or Loss From Insurance And Investment Contracts [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 4    
Realised gains and (losses) on financial investments      
Debt securities and money market investments 7 4 (15)
Loan [Member] | Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts Without Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 4    
Realised gains and (losses) on financial investments      
Debt securities and money market investments 7 4 (15)
Other [member] | Income Or Loss From Insurance And Investment Contracts [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 86 (90) 15
Represented by:      
Other   (1,030) 1,888
Other [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts Without Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 86 (90) 15
Represented by:      
Other   (1,030) 1,888
Assets designated at FVPL [member] | Income Or Loss From Insurance And Investment Contracts [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 15,252 13,280 13,435
Assets designated at FVPL [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts With Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 13,183 11,655 12,627
Assets designated at FVPL [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts Without Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL (305) (127) (562)
Assets designated at FVPL [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Investment Contracts With Direct Participating Features [Member]      
Net fair value change of financial investments at fair value through profit or loss, other than derivatives      
Net Fair Value Change of Financial Investments at FVPL 2,374 1,751 1,370
Assets mandatorily measured at FVPL [member] | Income Or Loss From Insurance And Investment Contracts [Member]      
Represented by:      
Assets mandatorily measured at FVPL 380 (1,686) (1,134)
Assets mandatorily measured at FVPL [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts With Direct Participating Features [Member]      
Represented by:      
Assets mandatorily measured at FVPL 212 (1,464) (1,181)
Assets mandatorily measured at FVPL [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts Without Direct Participating Features [Member]      
Represented by:      
Assets mandatorily measured at FVPL 174 (96) 95
Assets mandatorily measured at FVPL [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Investment Contracts With Direct Participating Features [Member]      
Represented by:      
Assets mandatorily measured at FVPL (7) € (127) € (48)
Other [member] | Other [member] | Income Or Loss From Insurance And Investment Contracts [Member]      
Represented by:      
Other 1,643    
Other [member] | Other [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts With Direct Participating Features [Member]      
Represented by:      
Other 0    
Other [member] | Other [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Insurance Contracts Without Direct Participating Features [Member]      
Represented by:      
Other 1,643    
Other [member] | Other [member] | Income Or Loss From Insurance And Investment Contracts [Member] | Investment Contracts With Direct Participating Features [Member]      
Represented by:      
Other € 0