v3.26.1
Derivatives - Summary of Detailed Information About Hedged Items (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Corporate Debt Hedge Program [Member] | Fair value hedges [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts, Liabilities € 57 € 66
Accumulated amount of fair value adjustments on the hedged item, Liabilities [1] € (17) € (19)
Balance sheet line item Trust pass-through securities Trust pass-through securities
Change in fair value of hedged item for ineffectiveness assessment [2] € 3 € 3
Offshore Liability Hedge Program [Member] | Fair value hedges [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts, Liabilities 12 12
Accumulated amount of fair value adjustments on the hedged item, Liabilities [1] € 2 € 2
Balance sheet line item Investment contracts without DPF Investment contracts without DPF
Synthetic Asset Fair value hedges [Member] | Fair value hedges [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts, Assets € 241 € 35
Accumulated amount of fair value adjustments on the hedged item, Assets [1] € (10) € 3
Balance sheet line item Investments Investments
Change in fair value of hedged item for ineffectiveness assessment [2] € (13) € (1)
Synethetic Asset Cash flow hedges [Member] | Cash flow hedges [member]    
Disclosure of detailed information about hedged items [line items]    
Change in fair value of hedged item for ineffectiveness assessment [2] 242 (215)
Cash flow hedge / currency translation reserve, Continuing hedges [3] 121 189
Life & Health Liability Investment Risk Hedge Program [Member] | Cash flow hedges [member]    
Disclosure of detailed information about hedged items [line items]    
Change in fair value of hedged item for ineffectiveness assessment [2] 18 (111)
Cash flow hedge / currency translation reserve, Continuing hedges [3] (408) (483)
Cash flow hedge / currency translation reserve, Discontinued hedges [3] (7) 126
Long Term Care (LTC) Liability Hedge Program [Member] | Cash flow hedges [member]    
Disclosure of detailed information about hedged items [line items]    
Change in fair value of hedged item for ineffectiveness assessment [2] 5 (21)
Cash flow hedge / currency translation reserve, Continuing hedges [3] (29) (38)
Cash flow hedge / currency translation reserve, Discontinued hedges [3] 895 1,095
IMD Payout Hedge [Member] | Cash flow hedges [member]    
Disclosure of detailed information about hedged items [line items]    
Cash flow hedge / currency translation reserve, Discontinued hedges [3] 23 31
TRS (Vivendi) Hedge [Member] | Cash flow hedges [member]    
Disclosure of detailed information about hedged items [line items]    
Cash flow hedge / currency translation reserve, Discontinued hedges [3] 3 3
Investments in foreign operations [Member] | Net investment hedges [member]    
Disclosure of detailed information about hedged items [line items]    
Cash flow hedge / currency translation reserve, Continuing hedges [3] € (331) € (383)
[1] Accumulated amount of fair value adjustments on the hedged item.
[2] Change in fair value of hedged item for ineffectiveness assessment.
[3] Cash flow hedge / currency translation reserve.