v3.26.1
Discontinued operations - Disclosure Of Fair Value Of Financial Instruments for Discontinued Operations Explanatory (Detail) - Recurring fair value measurement [member] - EUR (€)
€ in Millions
Jun. 30, 2026
Dec. 31, 2025
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value € 158,293 € 275,428
Financial liabilities at fair value 29,538 86,630
Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 67,603  
Investment contracts without DPF where the policyholder bears the risk [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 28,269 85,161
Investment contracts without DPF where the policyholder bears the risk [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 67,408  
Derivatives [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 1,269 1,469
Derivatives [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 196  
Level I [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 83,746 98,158
Financial liabilities at fair value 8 50
Level I [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 15  
Level I [member] | Investment contracts without DPF where the policyholder bears the risk [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 0  
Level I [member] | Derivatives [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 8 50
Level I [member] | Derivatives [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 15  
Level II [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 69,546 172,107
Financial liabilities at fair value 29,531 86,580
Level II [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 67,588  
Level II [member] | Investment contracts without DPF where the policyholder bears the risk [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 28,269 85,161
Level II [member] | Investment contracts without DPF where the policyholder bears the risk [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 67,408  
Level II [member] | Derivatives [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 1,262 1,419
Level II [member] | Derivatives [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 180  
Level III [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 5,000 5,163
Level III [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 0  
Level III [member] | Investment contracts without DPF where the policyholder bears the risk [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 0  
Level III [member] | Derivatives [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial liabilities at fair value 0  
Financial assets at fair value through profit or loss, category [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 105,752 225,671
Financial assets at fair value through profit or loss, category [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 136,248  
Financial assets at fair value through profit or loss, category [member] | Level I [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 77,579 91,886
Financial assets at fair value through profit or loss, category [member] | Level I [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 17,008  
Financial assets at fair value through profit or loss, category [member] | Level II [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 23,873 129,156
Financial assets at fair value through profit or loss, category [member] | Level II [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 118,899  
Financial assets at fair value through profit or loss, category [member] | Level III [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 4,299 4,630
Financial assets at fair value through profit or loss, category [member] | Level III [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 340  
Financial assets at fair value through profit or loss, category [member] | Shares [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 247 263
Financial assets at fair value through profit or loss, category [member] | Shares [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 13  
Financial assets at fair value through profit or loss, category [member] | Shares [member] | Level I [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 185 179
Financial assets at fair value through profit or loss, category [member] | Shares [member] | Level I [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 0  
Financial assets at fair value through profit or loss, category [member] | Shares [member] | Level II [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 13 30
Financial assets at fair value through profit or loss, category [member] | Shares [member] | Level II [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 13  
Financial assets at fair value through profit or loss, category [member] | Shares [member] | Level III [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 49 54
Financial assets at fair value through profit or loss, category [member] | Shares [member] | Level III [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 0  
Financial assets at fair value through profit or loss, category [member] | Debt securities [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 2,158 2,438
Financial assets at fair value through profit or loss, category [member] | Debt securities [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 563  
Financial assets at fair value through profit or loss, category [member] | Debt securities [member] | Level I [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 12 253
Financial assets at fair value through profit or loss, category [member] | Debt securities [member] | Level I [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 255  
Financial assets at fair value through profit or loss, category [member] | Debt securities [member] | Level II [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 2,019 2,075
Financial assets at fair value through profit or loss, category [member] | Debt securities [member] | Level II [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 308  
Financial assets at fair value through profit or loss, category [member] | Debt securities [member] | Level III [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 127 110
Financial assets at fair value through profit or loss, category [member] | Debt securities [member] | Level III [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 0  
Financial assets at fair value through profit or loss, category [member] | Money Markets and other short-term investment [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 1,089 1,868
Financial assets at fair value through profit or loss, category [member] | Money Markets and other short-term investment [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 126  
Financial assets at fair value through profit or loss, category [member] | Money Markets and other short-term investment [member] | Level I [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 1,089 1,708
Financial assets at fair value through profit or loss, category [member] | Money Markets and other short-term investment [member] | Level I [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 0  
Financial assets at fair value through profit or loss, category [member] | Money Markets and other short-term investment [member] | Level II [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value   160
Financial assets at fair value through profit or loss, category [member] | Money Markets and other short-term investment [member] | Level II [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 126  
Financial assets at fair value through profit or loss, category [member] | Money Markets and other short-term investment [member] | Level III [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 0  
Financial assets at fair value through profit or loss, category [member] | Other Investment [Member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 3,967 4,721
Financial assets at fair value through profit or loss, category [member] | Other Investment [Member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 659  
Financial assets at fair value through profit or loss, category [member] | Other Investment [Member] | Level I [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 21 18
Financial assets at fair value through profit or loss, category [member] | Other Investment [Member] | Level I [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 0  
Financial assets at fair value through profit or loss, category [member] | Other Investment [Member] | Level II [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 2 716
Financial assets at fair value through profit or loss, category [member] | Other Investment [Member] | Level II [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 659  
Financial assets at fair value through profit or loss, category [member] | Other Investment [Member] | Level III [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 3,944 3,987
Financial assets at fair value through profit or loss, category [member] | Other Investment [Member] | Level III [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 0  
Financial assets at fair value through profit or loss, category [member] | Derivatives [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 681 485
Financial assets at fair value through profit or loss, category [member] | Derivatives [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 53  
Financial assets at fair value through profit or loss, category [member] | Derivatives [member] | Level I [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 60 14
Financial assets at fair value through profit or loss, category [member] | Derivatives [member] | Level I [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 10  
Financial assets at fair value through profit or loss, category [member] | Derivatives [member] | Level II [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 621 464
Financial assets at fair value through profit or loss, category [member] | Derivatives [member] | Level II [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 35  
Financial assets at fair value through profit or loss, category [member] | Derivatives [member] | Level III [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value   8
Financial assets at fair value through profit or loss, category [member] | Derivatives [member] | Level III [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 8  
Financial assets at fair value through profit or loss, category [member] | Investments - Policyholder Risk [Member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 97,527 215,814
Financial assets at fair value through profit or loss, category [member] | Investments - Policyholder Risk [Member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 134,832  
Financial assets at fair value through profit or loss, category [member] | Investments - Policyholder Risk [Member] | Level I [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 76,213 89,715
Financial assets at fair value through profit or loss, category [member] | Investments - Policyholder Risk [Member] | Level I [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 16,743  
Financial assets at fair value through profit or loss, category [member] | Investments - Policyholder Risk [Member] | Level II [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 21,218 125,710
Financial assets at fair value through profit or loss, category [member] | Investments - Policyholder Risk [Member] | Level II [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 117,758  
Financial assets at fair value through profit or loss, category [member] | Investments - Policyholder Risk [Member] | Level III [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value 96 € 389
Financial assets at fair value through profit or loss, category [member] | Investments - Policyholder Risk [Member] | Level III [member] | Discontinued operations [member]    
Disclosure Of Fair Value Measurement Of Financial Instruments [Line Items]    
Financial assets at fair value € 332