v3.26.1
(Re)Insurance contracts and investment contracts with discretionary participation features - Summary of Insurance Contracts and Reinsurance Contracts by Type (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Opening assets € 125    
Beginning balance 188,359    
Opening net balance 188,233    
Opening assets, Reinsurance 16,021    
Other reinsurance finance income / (expenses) 564 € 611 € 699
Effect of changes in risk of non-performance of reinsurers     (12)
Closing net balance 176,049 188,233  
Closing assets 18 125  
Closing balance 176,067 188,359  
Closing assets, Reinsurance 17,153 16,021  
Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Opening assets 125    
Beginning balance 188,318    
Opening net balance 188,193    
Opening assets, Reinsurance 16,015    
Closing net balance 176,006 188,193  
Closing assets 18 125  
Closing balance 176,024 188,318  
Closing assets, Reinsurance 17,146 16,015  
Insurance contracts issued [member] | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Opening assets 125 185  
Beginning balance 188,318 177,407  
Opening net balance 188,193 177,222  
Insurance revenue (8,906) (9,656)  
Incurred claims and other insurance service expenses 7,589 7,958  
Amortization of insurance acquisition cash flows 538 553  
Onerous contract losses (and reversals) 1,139 1,118  
Adjustments for incurred claims 1 0  
Insurance service expenses 9,267 9,629  
Investment components 0 0  
Insurance service result 361 (27)  
Insurance finance (income) / expenses 18,143 11,986  
Cash flows (11,326) (11,892)  
Contracts disposed during the period 0 (85)  
Disposal of a business (7) 0  
Transfers to disposal groups 0 (3)  
Other movements 0 (4)  
Transfer (to)/from other headings 0 0  
Net exchange differences (19,358) 10,996  
Closing net balance 176,006 188,193 177,222
Closing assets 18 125 185
Closing balance 176,024 188,318 177,407
Insurance contracts issued [member] | Insurance contracts other than those to which premium allocation approach has been applied [member] | LRC [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Opening assets (1,373) (1,042)  
Beginning balance 1,252 945  
Opening net balance 2,625 1,987  
Insurance revenue 0 0  
Incurred claims and other insurance service expenses (378) (317)  
Amortization of insurance acquisition cash flows 0 0  
Onerous contract losses (and reversals) 1,139 1,118  
Adjustments for incurred claims 0 0  
Insurance service expenses 762 801  
Investment components 0 0  
Insurance service result 762 801  
Insurance finance (income) / expenses 138 62  
Cash flows (353) (299)  
Contracts disposed during the period 0 (94)  
Disposal of a business 0 0  
Transfers to disposal groups 0 14  
Other movements 0 0  
Transfer (to)/from other headings 10 0  
Net exchange differences (326) 153  
Closing net balance 2,856 2,625 1,987
Closing assets (27) (1,373) (1,042)
Closing balance 2,829 1,252 945
Insurance contracts issued [member] | Insurance contracts other than those to which premium allocation approach has been applied [member] | LFRC [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Opening assets 1,886 1,589  
Beginning balance 159,857 159,113  
Opening net balance 157,971 157,524  
Insurance revenue (8,906) (9,656)  
Incurred claims and other insurance service expenses 0 0  
Amortization of insurance acquisition cash flows 538 553  
Onerous contract losses (and reversals) 0 0  
Adjustments for incurred claims 0 0  
Insurance service expenses 538 553  
Investment components (5,809) (5,506)  
Insurance service result (14,177) (14,609)  
Insurance finance (income) / expenses 18,005 11,924  
Cash flows (4,721) (6,128)  
Contracts disposed during the period 0 8  
Disposal of a business (7) 0  
Transfers to disposal groups 0 (34)  
Other movements 0 1  
Transfer (to)/from other headings (10) (1)  
Net exchange differences (15,522) 9,286  
Closing net balance 141,539 157,971 157,524
Closing assets 59 1,886 1,589
Closing balance 141,597 159,857 159,113
Insurance contracts issued [member] | Insurance contracts other than those to which premium allocation approach has been applied [member] | Liability for incurred claims [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Opening assets (387) (362)  
Beginning balance 27,209 17,349  
Opening net balance 27,596 17,711  
Insurance revenue 0 0  
Incurred claims and other insurance service expenses 7,967 8,275  
Amortization of insurance acquisition cash flows 0 0  
Onerous contract losses (and reversals) 0 0  
Adjustments for incurred claims 1 0  
Insurance service expenses 7,967 8,275  
Investment components 5,809 5,506  
Insurance service result 13,776 13,781  
Insurance finance (income) / expenses 0 0  
Cash flows (6,252) (5,465)  
Contracts disposed during the period 0 0  
Disposal of a business 0 0  
Transfers to disposal groups 0 17  
Other movements 0 (5)  
Transfer (to)/from other headings 0 0  
Net exchange differences (3,510) 1,557  
Closing net balance 31,611 27,596 17,711
Closing assets (14) (387) (362)
Closing balance 31,597 27,209 17,349
Reinsurance contracts held [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Effect of changes in risk of non-performance of reinsurers 2 (5)  
Reinsurance contracts held [member] | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Opening assets, Reinsurance 16,015 16,601  
Opening liabilities, Reinsurance 303 608  
Net opening balance, Reinsurance 15,712 15,993  
Net expenses from reinsurance contracts 837 325  
Other reinsurance finance income / (expenses) 681 61  
Effect of changes in risk of non-performance of reinsurers 2 (5)  
Insurance finance (income) / expenses 683 55  
Total changes in the profit or loss and OCI 1,520 380  
Cash flows 1,680 (1,869)  
Cash flows of reInsurance 1,680 (1,869)  
Other movements of reinsurance 0 196  
Net exchange differences of reinsurance (1,961) 1,011  
Net closing balance, Reinsurance 16,950 15,712 15,993
Closing assets, Reinsurance 17,146 16,015 16,601
Closing liabilities, Reinsurance 195 303 608
Reinsurance contracts held [member] | Insurance contracts other than those to which premium allocation approach has been applied [member] | AFRC [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Opening assets, Reinsurance 15,965 16,457  
Opening liabilities, Reinsurance 2,011 1,738  
Net opening balance, Reinsurance 13,954 14,719  
Net expenses from reinsurance contracts 308 (619)  
Other reinsurance finance income / (expenses) 613 41  
Effect of changes in risk of non-performance of reinsurers 2 (5)  
Total changes in the profit or loss and OCI 922 (583)  
Cash flows of reInsurance 2,443 (1,460)  
Other movements of reinsurance 0 371  
Net exchange differences of reinsurance (1,761) 908  
Net closing balance, Reinsurance 15,558 13,954 14,719
Closing assets, Reinsurance 15,749 15,965 16,457
Closing liabilities, Reinsurance 191 2,011 1,738
Reinsurance contracts held [member] | Insurance contracts other than those to which premium allocation approach has been applied [member] | LRC [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Opening assets, Reinsurance 475 349  
Opening liabilities, Reinsurance (1,270) (947)  
Net opening balance, Reinsurance 1,745 1,296  
Net expenses from reinsurance contracts 254 876  
Other reinsurance finance income / (expenses) 69 19  
Effect of changes in risk of non-performance of reinsurers 0 0  
Total changes in the profit or loss and OCI 322 895  
Cash flows of reInsurance (166) (140)  
Other movements of reinsurance 0 (409)  
Net exchange differences of reinsurance (211) 103  
Net closing balance, Reinsurance 1,690 1,745 1,296
Closing assets, Reinsurance 1,693 475 349
Closing liabilities, Reinsurance 2 (1,270) (947)
Reinsurance contracts held [member] | AFIC [member] | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Opening assets, Reinsurance (426) (205)  
Opening liabilities, Reinsurance (439) (183)  
Net opening balance, Reinsurance 13 (22)  
Net expenses from reinsurance contracts 275 69  
Other reinsurance finance income / (expenses) 0 0  
Effect of changes in risk of non-performance of reinsurers 0 0  
Total changes in the profit or loss and OCI 275 69  
Cash flows of reInsurance (597) (268)  
Other movements of reinsurance 0 234  
Net exchange differences of reinsurance 10 0  
Net closing balance, Reinsurance (298) 13 (22)
Closing assets, Reinsurance (296) (426) (205)
Closing liabilities, Reinsurance € 2 € (439) € (183)