Statement Of Changes In Equity [Abstract]

Bank of Ireland GP - Filing #5616023

Concept	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Dividends recognised as distributions to non-controlling interests	– EUR	6,000,000 EUR	– EUR	– EUR	6,000,000 EUR	– EUR	– EUR	– EUR	– EUR	– EUR	– EUR	– EUR	– EUR	– EUR	– EUR	8,000,000 EUR	– EUR	8,000,000 EUR	– EUR	– EUR	– EUR	– EUR	– EUR	– EUR	– EUR	– EUR
Increase (decrease) through transactions with owners, equity	3,000,000 EUR	526,000,000 EUR	– EUR	456,000,000 EUR	70,000,000 EUR	459,000,000 EUR	– EUR	– EUR	– EUR	13,000,000 EUR	– EUR	13,000,000 EUR	– EUR	9,000,000 EUR	10,000,000 EUR	172,000,000 EUR	173,000,000 EUR	9,000,000 EUR	– EUR	– EUR	9,000,000 EUR	– EUR	– EUR	163,000,000 EUR	– EUR	– EUR
Purchase of treasury shares	– EUR	125,000,000 EUR	– EUR	125,000,000 EUR	– EUR	– EUR	– EUR	125,000,000 EUR	– EUR	– EUR	– EUR	– EUR	– EUR	– EUR	– EUR	50,000,000 EUR	– EUR	– EUR	– EUR	50,000,000 EUR	– EUR	– EUR	– EUR	50,000,000 EUR	– EUR	– EUR
Cancellation of treasury shares	– EUR	– EUR	– EUR	– EUR	– EUR	125,000,000 EUR	– EUR	125,000,000 EUR	– EUR	13,000,000 EUR	– EUR	13,000,000 EUR	– EUR	9,000,000 EUR	– EUR	– EUR	50,000,000 EUR	– EUR	– EUR	50,000,000 EUR	9,000,000 EUR	– EUR	– EUR	– EUR	– EUR	– EUR