v3.26.1
Offsetting, Enforceable Master Netting Arrangements, and Similar Agreements - Summary of Financial Instruments Set Off in Statement of Financial Position (Detail) - Derivatives [member] - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial assets subject to offsetting enforceable master netting arrangements and similar agreements [line items]    
Gross amounts € 851 € 723
Gross amounts set off in the statement of financial position 10 5
Net amounts of financial assets presented in the statement of financial position 841 718
Financial instruments [1] 369 628
Cash collateral received (excluding surplus collateral) [1] 66 81
Net amount 406 8
Financial liabilities subject to offsetting, enforceable master netting arrangements and similar agreements    
Gross amounts 1,359 2,302
Gross amounts set off in the statement of financial position 0 0
Net amounts of financial liabilities presented in the statement of financial position 1,359 2,302
Financial instruments [1] 710 1,537
Cash collateral received (excluding surplus collateral) [1] 602 710
Net amount € 47 € 55
[1] Related amounts not set off in the statements of financial position