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
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Disclosure In Tabular Form Of Investment Contracts With Discretionary Participating Features [Line Items]    
Opening assets € 0 € 0
Opening liabilities 21,281 22,332
Net opening balance, Investment contracts 21,281 22,332
Insurance revenue (19) (77)
Incurred claims and expenses 6 30
Onerous contract losses (and reversals) (1) 2
Insurance service expenses 6 32
Investment components 0 0
Insurance service result (13) (45)
Insurance finance (income) / expenses (440) 2,916
Cash flows (746) (2,744)
Transfers to disposal groups (20,196) 0
Net exchange differences 133 (1,177)
Net closing balance, Investment contracts 20 21,281
Closing assets 0 0
Closing liabilities 20 21,281
LFRC [member]    
Disclosure In Tabular Form Of Investment Contracts With Discretionary Participating Features [Line Items]    
Opening assets 0 0
Opening liabilities 21,278 22,332
Net opening balance, Investment contracts 21,278 22,332
Insurance revenue (19) (77)
Incurred claims and expenses 0 0
Onerous contract losses (and reversals) 0 0
Insurance service expenses 0 0
Investment components (838) (3,109)
Insurance service result (857) (3,186)
Insurance finance (income) / expenses (440) 2,916
Cash flows 99 394
Transfers to disposal groups (20,194) 0
Net exchange differences 133 (1,177)
Net closing balance, Investment contracts 20 21,278
Closing assets 0 0
Closing liabilities 20 21,278
LC [member]    
Disclosure In Tabular Form Of Investment Contracts With Discretionary Participating Features [Line Items]    
Opening assets 0 0
Opening liabilities 2 0
Net opening balance, Investment contracts 2 0
Insurance revenue 0 0
Incurred claims and expenses 0 0
Onerous contract losses (and reversals) (1) 2
Insurance service expenses (1) 2
Investment components 0 0
Insurance service result (1) 2
Insurance finance (income) / expenses 0 0
Cash flows 0 0
Transfers to disposal groups (1) 0
Net exchange differences 0 0
Net closing balance, Investment contracts 0 2
Closing assets 0 0
Closing liabilities 0 2
LFIC [member]    
Disclosure In Tabular Form Of Investment Contracts With Discretionary Participating Features [Line Items]    
Opening assets 0 0
Opening liabilities 1 0
Net opening balance, Investment contracts 1 0
Insurance revenue 0 0
Incurred claims and expenses 7 30
Onerous contract losses (and reversals) 0 0
Insurance service expenses 7 30
Investment components 838 3,109
Insurance service result 844 3,139
Insurance finance (income) / expenses 0 0
Cash flows (845) (3,138)
Transfers to disposal groups 0 0
Net exchange differences 0 0
Net closing balance, Investment contracts 0 1
Closing assets 0 0
Closing liabilities € 0 € 1