The interest rate on borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_7&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_BorrowingsInterestRate
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for repayments of bonds, notes and debentures.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2021-01-01
-Paragraph 17
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_17&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_RepaymentsOfBondsNotesAndDebentures
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of liabilities that are subordinate to other liabilities with respect to claims.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_SubordinatedLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Interest expense on subordinated loans.

+ References

No definition available.

+ Details

Name:	ing_InterestExpenseOnSubordinatedLoans
Namespace Prefix:	ing_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	ifrs-full_BorrowingsByNameAxis=ing_Tier1ContingentConvertibleSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=ing_FixedRateSubordinatedTier2GreenNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subordinated loans - Additional information (Details) € in Millions, ¥ in Billions, $ in Billions	6 Months Ended
	Jun. 30, 2022 EUR (€)	Jun. 30, 2021 EUR (€)	May 31, 2022 JPY (¥)	Apr. 30, 2022 USD ($)	Dec. 31, 2021 EUR (€)	Dec. 31, 2020 EUR (€)
Disclosure of detailed information about borrowings [line items]
Subordinated liabilities	€ 15,473				€ 16,715	€ 15,805
Redemption of subordinated loans	46,591	€ 32,233
Interest expense on subordinated loans	€ 316	€ 271
Perpetual Additional Tier 1 Contingent Convertible Capital Securities [member]
Disclosure of detailed information about borrowings [line items]
Subordinated liabilities \| $				$ 1
Borrowings, interest rate				6.875%
Fixed Rate Subordinated Tier 2 Green Notes [Member]
Disclosure of detailed information about borrowings [line items]
Subordinated liabilities \| ¥			¥ 10
Borrowings, interest rate			1.10%