Risk Report - Asset Quality - Financial Assets at Fair Value through OCI (Detail: Text Values) - EUR (€) € in Millions	Dec. 31, 2023	Dec. 31, 2022
Financial assets at fair value through OCI [Abstract]
Fair value of financial assets at Fair value through Other Comprehensive Income (FVOCI) subject to impairment	€ 36,000	€ 32,000
Of which: [Abstract]
Allowance for credit losses against these assets	€ 48	€ 69