Statement Of Changes In Equity [Abstract]

Severn Trent PLC - Filing #1912150

Concept	2022-04-01 to 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	As at 2023-03-31	2022-04-01 to 2023-03-31	As at 2023-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	As at 2022-03-31	As at 2022-03-31	As at 2022-03-31	2021-04-01 to 2022-03-31	As at 2022-03-31	As at 2022-03-31	As at 2021-03-31	As at 2021-03-31	As at 2021-03-31	As at 2021-03-31	As at 2021-03-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	970,600,000 GBP	408,700,000 GBP	249,100,000 GBP	—	—	—	162,500,000 GBP	—	150,300,000 GBP	—	—	—	—	248,100,000 GBP	394,400,000 GBP	473,000,000 GBP	—	1,263,900,000 GBP	148,400,000 GBP	651,700,000 GBP	101,700,000 GBP	1,138,700,000 GBP	148,100,000 GBP	237,200,000 GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	132,200,000 GBP	—	—	—	– GBP	– GBP	132,200,000 GBP	—	– GBP	—	– GBP	87,200,000 GBP	– GBP	– GBP	—	—	—	87,200,000 GBP	—	—	—	—	—	—	—
Other comprehensive income	187,300,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	196,500,000 GBP	—	—	—	—	—	—	—
Comprehensive income	55,100,000 GBP	—	—	—	– GBP	– GBP	57,000,000 GBP	—	1,900,000 GBP	—	– GBP	62,600,000 GBP	46,700,000 GBP	– GBP	—	—	—	109,300,000 GBP	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	261,300,000 GBP	—	—	—	– GBP	– GBP	261,300,000 GBP	—	– GBP	—	– GBP	254,500,000 GBP	– GBP	– GBP	—	—	—	254,500,000 GBP	—	—	—	—	—	—	—