THE CONNECTICUT LIGHT AND POWER COMPANY STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus, Paid In	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	The Connecticut Light and Power Company	The Connecticut Light and Power Company Common Stock	The Connecticut Light and Power Company Capital Surplus, Paid In	The Connecticut Light and Power Company Retained Earnings	The Connecticut Light and Power Company Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2022		348,443,855					6,035,205
Beginning balance at Dec. 31, 2022	$ 15,473,158	$ 1,799,920	$ 8,401,731	$ 5,527,153	$ (39,421)	$ 5,784,380	$ 60,352	$ 3,260,765	$ 2,463,094	$ 169
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income/(Loss)						518,733			518,733
Dividends on Preferred Stock	(7,519)			(7,519)		(5,559)			(5,559)
Dividends on Common Stock	(942,398)			(942,398)		(330,400)			(330,400)
Capital Contributions from Eversource Parent						123,500		123,500
Other Comprehensive Income/(Loss), Net of Tax						16				16
Ending balance (in shares) at Dec. 31, 2023		349,540,266					6,035,205
Ending balance at Dec. 31, 2023	14,173,892	$ 1,799,920	8,460,876	4,142,515	(33,737)	6,090,670	$ 60,352	3,384,265	2,645,868	185
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income/(Loss)						512,598			512,598
Dividends on Preferred Stock	(7,519)			(7,519)		(5,559)			(5,559)
Dividends on Common Stock	$ (1,025,027)			(1,025,027)		(333,800)			(333,800)
Capital Contributions from Eversource Parent						300,000		300,000
Other Comprehensive Income/(Loss), Net of Tax					7,200	(27)				(27)
Ending balance (in shares) at Dec. 31, 2024	366,608,052	366,608,052					6,035,205
Ending balance at Dec. 31, 2024	$ 15,039,387	$ 1,878,622	9,428,905	3,929,141	(26,472)	6,563,882	$ 60,352	3,684,265	2,819,107	158
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income/(Loss)						551,329			551,329
Dividends on Preferred Stock	(7,519)			(7,519)		(5,559)			(5,559)
Dividends on Common Stock	$ (1,116,530)			(1,116,530)		(430,000)			(430,000)
Other Comprehensive Income/(Loss), Net of Tax					6,000	(26)				(26)
Ending balance (in shares) at Dec. 31, 2025	375,416,880	375,416,880					6,035,205
Ending balance at Dec. 31, 2025	$ 16,197,271	$ 1,914,273	$ 9,937,878	$ 4,504,983	$ (20,507)	$ 6,679,626	$ 60,352	$ 3,684,265	$ 2,934,877	$ 132