v3.26.1
(Re)Insurance contracts and investment contracts with discretionary participation features - Summary of Investment Contracts with Discretionary Participating Features (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure In Tabular Form Of Investment Contracts With Discretionary Participating Features [Line Items]    
Opening assets € 0 € 0
Opening liabilities 22,332 21,594
Net opening balance, Investment contracts 22,332 21,594
Insurance revenue (77) (80)
Incurred claims and expenses 30 43
Onerous contract losses (and reversals) 2 0
Insurance service expenses 32 43
Investment components 0 0
Insurance service result (45) (37)
Insurance finance (income) / expenses 2,916 2,270
Cash flows (2,744) (2,525)
Net exchange differences (1,177) 1,030
Net closing balance, Investment contracts 21,281 22,332
Closing assets 0 0
Closing liabilities 21,281 22,332
LFRC [member]    
Disclosure In Tabular Form Of Investment Contracts With Discretionary Participating Features [Line Items]    
Opening assets 0 0
Opening liabilities 22,332 21,594
Net opening balance, Investment contracts 22,332 21,594
Insurance revenue (77) (80)
Incurred claims and expenses 0 0
Onerous contract losses (and reversals) 0 0
Insurance service expenses 0 0
Investment components (3,109) (2,934)
Insurance service result (3,186) (3,014)
Insurance finance (income) / expenses 2,916 2,270
Cash flows 394 452
Net exchange differences (1,177) 1,030
Net closing balance, Investment contracts 21,278 22,332
Closing assets 0 0
Closing liabilities 21,278 22,332
LC [member]    
Disclosure In Tabular Form Of Investment Contracts With Discretionary Participating Features [Line Items]    
Opening assets 0 0
Opening liabilities 0 0
Net opening balance, Investment contracts 0 0
Insurance revenue 0 0
Incurred claims and expenses 0 0
Onerous contract losses (and reversals) 2 0
Insurance service expenses 2 0
Investment components 0 0
Insurance service result 2 0
Insurance finance (income) / expenses 0 0
Cash flows 0 0
Net exchange differences 0 0
Net closing balance, Investment contracts 2 0
Closing assets 0 0
Closing liabilities 2 0
LFIC [member]    
Disclosure In Tabular Form Of Investment Contracts With Discretionary Participating Features [Line Items]    
Opening assets 0 0
Opening liabilities 0 0
Net opening balance, Investment contracts 0 0
Insurance revenue 0 0
Incurred claims and expenses 30 43
Onerous contract losses (and reversals) 0 0
Insurance service expenses 30 43
Investment components 3,109 2,934
Insurance service result 3,139 2,977
Insurance finance (income) / expenses 0 0
Cash flows (3,138) (2,977)
Net exchange differences 0 0
Net closing balance, Investment contracts 1 0
Closing assets 0 0
Closing liabilities € 1 € 0