v3.26.1
Segment Information - Summary of Investments (Detail)
€ in Millions, $ in Millions
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Disclosure of summarized investment per segment [line items]        
Total investments on balance sheet € 285,141 € 293,716    
Off-balance sheet investments third parties 606,437 603,380    
Total revenue-generating investments 891,578 897,096    
Investments in real estate 479 514 $ 514 $ 488
Financial assets measured at amortized cost 9,719 10,645    
Backing insurance contracts without direct participation [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVOCI 41,109 46,757    
Financial assets measured at FVPL 7,845 8,616    
Non-insurance related assets [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVOCI 8,648 7,959    
Financial assets measured at FVPL 86,320 78,371    
Backing direct participation insurance contracts [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVPL 109,580 117,167    
Backing direct participation investment contracts [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVPL 21,441 23,687    
Shares [member]        
Disclosure of summarized investment per segment [line items]        
Investments 15,595 15,515    
Debt securities [member]        
Disclosure of summarized investment per segment [line items]        
Investments 56,202 60,890    
Unconsolidated investment funds [member]        
Disclosure of summarized investment per segment [line items]        
Investments 190,671 192,775    
Loans [member]        
Disclosure of summarized investment per segment [line items]        
Investments 11,481 12,743    
Other financial asset [member]        
Disclosure of summarized investment per segment [line items]        
Investments 10,713 11,278    
Real estate [member]        
Disclosure of summarized investment per segment [line items]        
Investments 479 514    
Americas [member]        
Disclosure of summarized investment per segment [line items]        
Total investments on balance sheet 158,284 173,726    
Off-balance sheet investments third parties 220,501 228,398    
Total revenue-generating investments 378,786 402,124    
Investments in real estate 24 40    
Financial assets measured at amortized cost 9,671 10,597    
Americas [member] | Backing insurance contracts without direct participation [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVOCI 39,952 45,424    
Financial assets measured at FVPL 6,811 7,457    
Americas [member] | Non-insurance related assets [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVOCI 8,540 7,906    
Financial assets measured at FVPL 27,540 29,068    
Americas [member] | Backing direct participation insurance contracts [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVPL 65,746 73,233    
Americas [member] | Backing direct participation investment contracts [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVPL 0 0    
Americas [member] | Shares [member]        
Disclosure of summarized investment per segment [line items]        
Investments 211 256    
Americas [member] | Debt securities [member]        
Disclosure of summarized investment per segment [line items]        
Investments 48,104 52,572    
Americas [member] | Unconsolidated investment funds [member]        
Disclosure of summarized investment per segment [line items]        
Investments 92,292 101,401    
Americas [member] | Loans [member]        
Disclosure of summarized investment per segment [line items]        
Investments 9,753 10,679    
Americas [member] | Other financial asset [member]        
Disclosure of summarized investment per segment [line items]        
Investments 7,900 8,778    
Americas [member] | Real estate [member]        
Disclosure of summarized investment per segment [line items]        
Investments 24 40    
United Kingdom [member]        
Disclosure of summarized investment per segment [line items]        
Total investments on balance sheet 125,128 118,218    
Off-balance sheet investments third parties 158,105 149,282    
Total revenue-generating investments 283,233 267,500    
Investments in real estate 437 457    
United Kingdom [member] | Backing insurance contracts without direct participation [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVOCI   0    
Financial assets measured at FVPL 990 1,140    
United Kingdom [member] | Non-insurance related assets [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVOCI   0    
Financial assets measured at FVPL 58,668 49,222    
United Kingdom [member] | Backing direct participation insurance contracts [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVPL 43,592 43,712    
United Kingdom [member] | Backing direct participation investment contracts [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVPL 21,441 23,687    
United Kingdom [member] | Shares [member]        
Disclosure of summarized investment per segment [line items]        
Investments 15,315 15,196    
United Kingdom [member] | Debt securities [member]        
Disclosure of summarized investment per segment [line items]        
Investments 6,871 6,952    
United Kingdom [member] | Unconsolidated investment funds [member]        
Disclosure of summarized investment per segment [line items]        
Investments 98,164 91,172    
United Kingdom [member] | Loans [member]        
Disclosure of summarized investment per segment [line items]        
Investments 1,714 2,051    
United Kingdom [member] | Other financial asset [member]        
Disclosure of summarized investment per segment [line items]        
Investments 2,627 2,389    
United Kingdom [member] | Real estate [member]        
Disclosure of summarized investment per segment [line items]        
Investments 437 457    
International [Member]        
Disclosure of summarized investment per segment [line items]        
Total investments on balance sheet 1,487 1,599    
Off-balance sheet investments third parties 4,602 4,507    
Total revenue-generating investments 6,089 6,106    
Investments in real estate 19 17    
Financial assets measured at amortized cost 1 1    
International [Member] | Backing insurance contracts without direct participation [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVOCI 1,158 1,332    
Financial assets measured at FVPL 43 19    
International [Member] | Non-insurance related assets [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVOCI 7 7    
Financial assets measured at FVPL 18 0    
International [Member] | Backing direct participation insurance contracts [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVPL 243 222    
International [Member] | Backing direct participation investment contracts [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVPL   0    
International [Member] | Shares [member]        
Disclosure of summarized investment per segment [line items]        
Investments 60 54    
International [Member] | Debt securities [member]        
Disclosure of summarized investment per segment [line items]        
Investments 1,125 1,279    
International [Member] | Unconsolidated investment funds [member]        
Disclosure of summarized investment per segment [line items]        
Investments 215 202    
International [Member] | Loans [member]        
Disclosure of summarized investment per segment [line items]        
Investments 3 2    
International [Member] | Other financial asset [member]        
Disclosure of summarized investment per segment [line items]        
Investments 67 45    
International [Member] | Real estate [member]        
Disclosure of summarized investment per segment [line items]        
Investments 19 17    
Asset management [member]        
Disclosure of summarized investment per segment [line items]        
Total investments on balance sheet 230 162    
Off-balance sheet investments third parties 223,228 221,192    
Total revenue-generating investments 223,459 221,354    
Financial assets measured at amortized cost 36 36    
Asset management [member] | Backing insurance contracts without direct participation [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVPL   0    
Asset management [member] | Non-insurance related assets [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVOCI 100 46    
Financial assets measured at FVPL 94 80    
Asset management [member] | Backing direct participation investment contracts [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVPL   0    
Asset management [member] | Shares [member]        
Disclosure of summarized investment per segment [line items]        
Investments 9 9    
Asset management [member] | Debt securities [member]        
Disclosure of summarized investment per segment [line items]        
Investments 102 88    
Asset management [member] | Other financial asset [member]        
Disclosure of summarized investment per segment [line items]        
Investments 119 66    
Holding and other activities [member]        
Disclosure of summarized investment per segment [line items]        
Total investments on balance sheet 11 11    
Total revenue-generating investments 11 11    
Financial assets measured at amortized cost 11 11    
Holding and other activities [member] | Backing insurance contracts without direct participation [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVPL   0    
Holding and other activities [member] | Non-insurance related assets [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVPL   0    
Holding and other activities [member] | Backing direct participation investment contracts [member]        
Disclosure of summarized investment per segment [line items]        
Financial assets measured at FVPL   0    
Holding and other activities [member] | Loans [member]        
Disclosure of summarized investment per segment [line items]        
Investments € 11 € 11