THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus, Paid In	Retained Earnings	Accumulated Other Comprehensive 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 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						148,416			148,416
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	(235,354)			(235,354)		(82,600)			(82,600)
Other Comprehensive Income (Loss)						36				36
Ending balance (in shares) at Mar. 31, 2023		348,808,082					6,035,205
Ending balance at Mar. 31, 2023	15,749,371	$ 1,799,920	8,412,085	5,782,958	(36,191)	5,848,842	$ 60,352	3,260,765	2,527,520	205
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						281,716
Other Comprehensive Income (Loss)						29
Ending balance (in shares) at Jun. 30, 2023		349,021,936					6,035,205
Ending balance at Jun. 30, 2023	15,554,098	$ 1,799,920	8,428,786	5,562,889	(32,103)	5,898,145	$ 60,352	3,260,765	2,576,830	198
Beginning balance (in shares) at Mar. 31, 2023		348,808,082					6,035,205
Beginning balance at Mar. 31, 2023	15,749,371	$ 1,799,920	8,412,085	5,782,958	(36,191)	5,848,842	$ 60,352	3,260,765	2,527,520	205
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income						133,300			133,300
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	(235,491)			(235,491)		(82,600)			(82,600)
Other Comprehensive Income (Loss)						(7)				(7)
Ending balance (in shares) at Jun. 30, 2023		349,021,936					6,035,205
Ending balance at Jun. 30, 2023	$ 15,554,098	$ 1,799,920	8,428,786	5,562,889	(32,103)	5,898,145	$ 60,352	3,260,765	2,576,830	198
Beginning balance (in shares) at Dec. 31, 2023	349,540,266	349,540,266					6,035,205
Beginning 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						138,353			138,353
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	(250,770)			(250,770)		(82,500)			(82,500)
Capital Contributions from Eversource Parent						100,000		100,000
Other Comprehensive Income (Loss)						(7)				(7)
Ending balance (in shares) at Mar. 31, 2024		351,379,414					6,035,205
Ending balance at Mar. 31, 2024	$ 14,543,588	$ 1,806,385	8,537,591	4,413,593	(28,534)	6,245,126	$ 60,352	3,484,265	2,700,331	178
Beginning balance (in shares) at Dec. 31, 2023	349,540,266	349,540,266					6,035,205
Beginning 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						269,954
Other Comprehensive Income (Loss)						(13)
Ending balance (in shares) at Jun. 30, 2024	354,566,071	354,566,071					6,035,205
Ending balance at Jun. 30, 2024	$ 14,818,713	$ 1,820,954	8,710,844	4,496,830	(29,581)	6,475,331	$ 60,352	3,584,265	2,830,542	172
Beginning balance (in shares) at Mar. 31, 2024		351,379,414					6,035,205
Beginning balance at Mar. 31, 2024	14,543,588	$ 1,806,385	8,537,591	4,413,593	(28,534)	6,245,126	$ 60,352	3,484,265	2,700,331	178
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income						131,601			131,601
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	$ (252,104)			(252,104)
Capital Contributions from Eversource Parent						100,000		100,000
Other Comprehensive Income (Loss)						(6)				(6)
Ending balance (in shares) at Jun. 30, 2024	354,566,071	354,566,071					6,035,205
Ending balance at Jun. 30, 2024	$ 14,818,713	$ 1,820,954	$ 8,710,844	$ 4,496,830	$ (29,581)	$ 6,475,331	$ 60,352	$ 3,584,265	$ 2,830,542	$ 172