v3.26.1
Financial Risks - Schedule of Ratings Distribution of General Account Portfolios (Detail) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about credit rating [line items]    
Amortized cost € 9,719 € 10,645
Fair value 59,574 65,375
Total 69,293 76,020
AAA [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 847 1,013
Fair value 5,822 5,400
Total 6,669 6,412
AA [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 4,023 4,421
Fair value 8,462 9,805
Total 12,485 14,226
A [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 4,355 4,571
Fair value 19,491 20,674
Total 23,846 25,245
BBB [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 426 668
Fair value 18,756 21,405
Total 19,182 22,073
BB [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 1 4
Fair value 1,007 1,205
Total 1,007 1,209
B [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 93 78
Fair value 277 492
Total 370 570
CCC or lower [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 8 8
Fair value 570 726
Total 577 733
Assets not rated [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 5,189 5,668
Total 5,189 5,668
Credit rating general account investments [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 9,752 10,763
Fair value 59,574 65,375
Total 69,326 76,138
ECL on financial assets [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost (33) (118)
Fair value (347) (341)
Total (380) (459)
Americas [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 9,671 10,597
Fair value 56,690 62,258
Americas [member] | AAA [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 847 1,013
Fair value 5,625 5,265
Americas [member] | AA [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 4,023 4,421
Fair value 7,916 9,114
Americas [member] | A [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 4,319 4,546
Fair value 18,580 19,771
Americas [member] | BBB [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 423 654
Fair value 18,406 20,895
Americas [member] | BB [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 0 4
Fair value 984 1,162
Americas [member] | B [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 93 78
Fair value 262 487
Americas [member] | CCC or lower [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 569 720
Americas [member] | Assets not rated [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 4,349 4,844
Americas [member] | Credit rating general account investments [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 9,704 10,715
Fair value 56,690 62,258
Americas [member] | ECL on financial assets [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost (33) (118)
Fair value (340) (327)
United Kingdom [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 1,420 1,569
United Kingdom [member] | AAA [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 30 25
United Kingdom [member] | AA [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 416 525
United Kingdom [member] | A [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 217 220
United Kingdom [member] | BBB [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 4 59
United Kingdom [member] | BB [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 1 1
United Kingdom [member] | Assets not rated [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 744 740
United Kingdom [member] | Credit rating general account investments [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 1,420 1,569
International [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 1 1
Fair value 1,266 1,395
International [member] | AAA [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 40 37
International [member] | AA [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 130 167
International [member] | A [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 1 1
Fair value 694 684
International [member] | BBB [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 346 451
International [member] | BB [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 22 42
International [member] | B [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 8 5
International [member] | CCC or lower [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 1 6
International [member] | Assets not rated [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 24 4
International [member] | Credit rating general account investments [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 1 1
Fair value 1,266 1,395
International [member] | ECL on financial assets [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value (7) (14)
Asset management [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 36 36
Fair value 194 126
Asset management [member] | AAA [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost   0
Fair value 127 73
Asset management [member] | A [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 24 24
Asset management [member] | BBB [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 3 3
Asset management [member] | BB [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 1 1
Asset management [member] | CCC or lower [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 8 8
Asset management [member] | Assets not rated [member]    
Disclosure of detailed information about credit rating [line items]    
Fair value 68 54
Asset management [member] | Credit rating general account investments [member]    
Disclosure of detailed information about credit rating [line items]    
Amortized cost 36 36
Fair value € 194 € 126