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Staff expenses - Additional Information (Details)
€ in Millions
12 Months Ended
Dec. 31, 2023
EUR (€)
shares
Dec. 31, 2022
EUR (€)
shares
Dec. 31, 2021
EUR (€)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expense related in equity settled share based payment arrangements | € € 31 € 25 € 29
Expense related in cash settled share based payment arrangements | € € 0 € 1 € 2
Share awards related in equity settled share based payment arrangements (in shares) 3,897,800 3,201,579 3,154,715
Share awards related in cash settled share based payment arrangements (in shares) 0 497,976 519,957
Unrecognised compensation cost related to share awards amount | € € 15 € 13 € 13
Costs expected to be recognised over weighted average period 2 years 1 year 10 months 24 days 1 year 8 months 12 days
Executive Board members      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share awards granted (in shares) 52,693 55,651 0
Management board of ING Bank      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share awards granted (in shares) 172,103 137,506 123,750
Senior management and other employees      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share awards granted (in shares) 3,244,951 2,913,926 3,267,372