Statement Of Financial Position [Abstract]

Severn Trent PLC - Filing #1912150

Concept	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2022-03-31	As at 2022-03-31	As at 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 financial position [abstract]
Assets [abstract]
Property, plant and equipment	10,716,900,000 GBP	—	—	—	—	—	—	—	10,208,400,000 GBP	—	—	—	—	—	—
Right-of-use assets	129,300,000 GBP	—	—	—	—	—	—	—	129,900,000 GBP	—	—	—	—	—	—
Goodwill	92,700,000 GBP	—	—	—	—	—	—	—	91,400,000 GBP	—	—	—	—	—	—
Intangible assets other than goodwill	185,900,000 GBP	—	—	—	—	—	—	—	179,600,000 GBP	—	—	—	—	—	—
Current tax assets	9,900,000 GBP	—	—	—	—	—	—	—	6,200,000 GBP	—	—	—	—	—	—
Cash and cash equivalents	34,200,000 GBP	—	—	—	—	—	—	—	115,400,000 GBP	—	—	—	—	—	—
Equity and liabilities [abstract]
Equity [abstract]
Issued capital	249,100,000 GBP	—	—	—	—	—	—	—	248,100,000 GBP	—	—	—	—	—	—
Retained earnings	162,500,000 GBP	—	—	—	—	—	—	—	473,000,000 GBP	—	—	—	—	—	—
Share premium	408,700,000 GBP	—	—	—	—	—	—	—	394,400,000 GBP	—	—	—	—	—	—
Other reserves	150,300,000 GBP	—	—	—	—	—	—	—	148,400,000 GBP	—	—	—	—	—	—
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
Liabilities [abstract]
Deferred tax liabilities	1,293,500,000 GBP	—	—	—	—	—	—	—	1,320,600,000 GBP	—	—	—	—	—	—