CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating Activities:
Net Income	$ 851,884	$ 1,090,356
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	962,477	885,711
Deferred Income Taxes	78,276	170,752
Uncollectible Expense	40,945	40,753
Pension, SERP and PBOP Income, Net	(64,311)	(120,416)
Pension Contributions	(5,000)	(80,000)
Regulatory Over/(Under) Recoveries, Net	(4,148)	(32,193)
Amortization	(438,460)	418,644
Cost of Removal Expenditures	(237,368)	(284,706)
Customer Credits Distributed in 2022 at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	0	(72,041)
Payment in 2022 of Withheld Property Taxes	0	(78,446)
Impairment of Offshore Wind Investment	401,000	0
Other	(114,111)	(34,702)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	6,738	(294,383)
Taxes Receivable/Accrued, Net	177,618	160,260
Accounts Payable	(385,741)	11,821
Other Current Assets and Liabilities, Net	(100,646)	(92,506)
Net Cash Flows (Used In)/Provided by Operating Activities	1,169,153	1,688,904
Investing Activities:
Investments in Property, Plant and Equipment	(3,125,617)	(2,352,743)
Proceeds from Sales of Marketable Securities	341,871	340,660
Purchases of Marketable Securities	(287,814)	(313,714)
Investments in Unconsolidated Affiliates	(887,365)	(617,588)
Other Investing Activities	(57)	15,245
Net Cash Flows Used in Investing Activities	(3,958,982)	(2,928,140)
Financing Activities:
Issuance of Common Shares, Net of Issuance Costs	0	197,108
Cash Dividends on Common Shares	(688,878)	(643,634)
Cash Dividends on Preferred Stock	(5,639)	(5,639)
Increase/(Decrease) in Notes Payable	87,600	(1,103,950)
Repayment of Rate Reduction Bonds	(43,210)	(43,210)
Issuance of Long-Term Debt	4,340,300	4,045,000
Retirement of Long-Term Debt	(1,203,000)	(775,000)
Other Financing Activities	(38,189)	(50,191)
Net Cash Flows Provided by Financing Activities	2,448,984	1,620,484
Net (Decrease)/Increase in Cash, Cash Equivalents and Restricted Cash	(340,845)	381,248
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	521,752	221,008
Cash and Restricted Cash - End of Period	$ 180,907	$ 602,256