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SCHEDULE I - FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF (LOSS)/INCOME (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Condensed Income Statements, Captions [Line Items] |  |  |
Operating Revenues | $ 11,910,705 | $ 12,289,336 | $ 9,863,085
Operating Expenses: |  |  |
Other | 1,895,703 | 1,865,328 | 1,739,685
Operating Income (Loss) | 2,399,335 | 2,198,154 | 1,993,321
Interest Expense | 855,441 | 678,274 | 582,334
Other Income, Net: |  |  |
Equity in (Losses)/Earnings of Subsidiaries | 15,500 | 22,900 | 14,200
Other (Loss)/Income, Net | 348,069 | 346,088 | 161,282
(Loss)/Income Before Income Tax Benefit | (275,037) | 1,865,968 | 1,572,269
Income Tax Benefit | 159,684 | 453,574 | 344,223
Net (Loss)/Income | $ (434,700) | $ 1,412,400 | $ 1,228,000
Basic (Loss)/Earnings Per Common Share (in dollars per share) | $ (1.27) | $ 4.05 | $ 3.55
Diluted (Loss)/Earnings Per Common Share (in dollars per share) | $ (1.26) | $ 4.05 | $ 3.54
Weighted Average Common Shares Outstanding: |  |  |
Basic (in shares) | 349,580,638 | 346,783,444 | 343,972,926
Diluted (in shares) | 349,840,481 | 347,246,768 | 344,631,056
Eversource |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Operating Revenues | $ 840 | $ 0 | $ 0
Operating Expenses: |  |  |
Other | 12,769 | 26,708 | 43,048
Operating Income (Loss) | (11,929) | (26,708) | (43,048)
Interest Expense | 397,281 | 237,773 | 163,613
Other Income, Net: |  |  |
Equity in (Losses)/Earnings of Subsidiaries | (312,040) | 1,565,474 | 1,345,199
Other, Net | 188,003 | 79,383 | 47,802
Other (Loss)/Income, Net | (124,037) | 1,644,857 | 1,393,001
(Loss)/Income Before Income Tax Benefit | (533,247) | 1,380,376 | 1,186,340
Income Tax Benefit | (91,007) | (24,499) | (34,187)
Net (Loss)/Income | $ (442,240) | $ 1,404,875 | $ 1,220,527
Basic (Loss)/Earnings Per Common Share (in dollars per share) | $ (1.27) | $ 4.05 | $ 3.55
Diluted (Loss)/Earnings Per Common Share (in dollars per share) | $ (1.26) | $ 4.05 | $ 3.54
Weighted Average Common Shares Outstanding: |  |  |
Basic (in shares) | 349,580,638 | 346,783,444 | 343,972,926
Diluted (in shares) | 349,840,481 | 347,246,768 | 344,631,056

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