Analysis Of Income And Expense [Abstract]

British Land Co PLC - Filing #3461623

Concept	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31
Analysis of income and expense [abstract]
Revenue [abstract]
Revenue	—	174,000,000 GBP	401,000,000 GBP	—	—	575,000,000 GBP	—	—	—	—	—	—	—	—	– GBP	418,000,000 GBP	—	—	—	—	—	418,000,000 GBP
Material income and expense [abstract]
Finance income (cost)	—	41,000,000 GBP	55,000,000 GBP	—	—	96,000,000 GBP	—	—	—	—	—	—	—	—	88,000,000 GBP	60,000,000 GBP	—	—	—	—	—	28,000,000 GBP
Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract]
Share of profit (loss) of joint ventures accounted for using equity method	—	179,000,000 GBP	100,000,000 GBP	—	—	79,000,000 GBP	—	—	—	—	—	—	—	—	559,000,000 GBP	92,000,000 GBP	—	—	—	—	—	467,000,000 GBP
Share of profit (loss) of associates and joint ventures accounted for using equity method	—	179,000,000 GBP	100,000,000 GBP	—	—	79,000,000 GBP	—	—	—	—	—	—	—	—	559,000,000 GBP	92,000,000 GBP	—	—	—	—	—	467,000,000 GBP
Comprehensive income, continuing and discontinued operations [abstract]
Comprehensive income	– GBP	—	—	3,000,000 GBP	2,000,000 GBP	1,000,000 GBP	– GBP	– GBP	– GBP	1,000,000 GBP	2,000,000 GBP	10,000,000 GBP	1,028,000,000 GBP	– GBP	—	—	– GBP	– GBP	1,038,000,000 GBP	1,000,000 GBP	– GBP	1,029,000,000 GBP