Disclosure Of Analysis Of Other Comprehensive Income By Item [Text Block]

NATIONWIDE BUILDING SOCIETY - Filing #4370996

Concept	2023-04-05 to 2024-04-04	2023-04-05 to 2024-04-04	2023-04-05 to 2024-04-04	2023-04-05 to 2024-04-04	2023-04-05 to 2024-04-04	2023-04-05 to 2024-04-04	2023-04-05 to 2024-04-04	2023-04-05 to 2024-04-04	2022-04-05 to 2023-04-04	2022-04-05 to 2023-04-04	2022-04-05 to 2023-04-04	2022-04-05 to 2023-04-04	2022-04-05 to 2023-04-04	2022-04-05 to 2023-04-04	2022-04-05 to 2023-04-04	2022-04-05 to 2023-04-04
Disclosure of analysis of other comprehensive income by item [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Disclosure of analysis of other comprehensive income by item [abstract]
Disclosure of analysis of other comprehensive income by item [line items]
Other comprehensive income, net of tax, cash flow hedges	- GBP	49,000,000 GBP	49,000,000 GBP	- GBP	- GBP	- GBP	- GBP	- GBP	- GBP	- GBP	8,000,000 GBP	- GBP	8,000,000 GBP	- GBP	- GBP	- GBP
Other comprehensive income, net of tax, change in value of foreign currency basis spreads	- GBP	4,000,000 GBP	- GBP	- GBP	- GBP	4,000,000 GBP	- GBP	- GBP	- GBP	- GBP	- GBP	- GBP	4,000,000 GBP	- GBP	4,000,000 GBP	- GBP
Other comprehensive income, net of tax, financial assets measured at fair value through other comprehensive income	—	28,000,000 GBP	—	—	—	—	—	—	—	—	—	—	101,000,000 GBP	—	—	—
Other comprehensive income, net of tax, gains (losses) from investments in equity instruments	—	4,000,000 GBP	—	—	—	—	—	—	—	—	—	—	2,000,000 GBP	—	—	—
Other comprehensive income, net of tax, gains (losses) on revaluation of property, plant and equipment, right-of-use assets and intangible assets	2,000,000 GBP	2,000,000 GBP	- GBP	- GBP	- GBP	- GBP	- GBP	- GBP	- GBP	1,000,000 GBP	- GBP	- GBP	1,000,000 GBP	- GBP	- GBP	- GBP
Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans	- GBP	190,000,000 GBP	- GBP	- GBP	- GBP	- GBP	- GBP	190,000,000 GBP	56,000,000 GBP	- GBP	- GBP	- GBP	56,000,000 GBP	- GBP	- GBP	- GBP