XML 403 R21.htm IDEA: XBRL DOCUMENT v3.24.0.1
Insurance contracts linked to pensions
 12 Months Ended
Dec. 31, 2023
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [abstract]  
Insurance contracts linked to pensions Insurance contracts linked to pensions
The detail of Insurance contracts linked to pensions in the consolidated balance sheets is as follows:
EUR million
202320222021
Assets relating to insurance contracts covering post-employment benefit plan obligations:
Banco Santander, S.A.93 104 149 
93 104 149