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SEGMENT INFORMATION - Summary of Segment Information and Segmented Total Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | $ 2,533,522 |  | $ 2,629,342 | $ 5,866,097 | $ 6,424,985
Depreciation and Amortization | (240,400) |  | (101,500) | (578,000) | (338,500)
Other Operating Expenses | (1,690,600) |  | (1,967,100) | (3,839,600) | (4,776,300)
Operating Income | 602,498 |  | 560,662 | 1,448,470 | 1,310,234
Interest Expense | (271,300) |  | (207,300) | (522,100) | (401,900)
Impairment of Offshore Wind Investment | 0 | $ (1,770,000) | (401,000) | 0 | (401,000)
Other Income, Net | 115,285 |  | 94,875 | 206,315 | 183,857
Net Income Attributable to Common Shareholders | 335,341 |  | 15,422 | 857,190 | 506,581
Cash Flows Used for Investments in Plant |  |  |  | 2,220,900 | 2,039,500
Assets | 58,352,454 | 55,612,245 |  | 58,352,454 |
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 395,200 |  | 408,800 | 838,800 | 822,700
Depreciation and Amortization | (48,500) |  | (38,000) | (94,100) | (74,800)
Other Operating Expenses | (314,200) |  | (337,200) | (663,700) | (676,900)
Operating Income | 32,500 |  | 33,600 | 81,000 | 71,000
Interest Expense | (161,000) |  | (100,600) | (307,200) | (185,700)
Impairment of Offshore Wind Investment |  |  | (401,000) |  | (401,000)
Other Income, Net | 473,500 |  | 100,900 | 1,096,200 | 666,800
Net Income Attributable to Common Shareholders | 351,800 |  | (292,400) | 892,300 | 224,700
Cash Flows Used for Investments in Plant |  |  |  | 125,600 | 139,100
Assets | 28,662,100 | 26,337,700 |  | 28,662,100 |
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | (813,100) |  | (781,200) | (1,649,800) | (1,542,100)
Depreciation and Amortization | 2,700 |  | 2,200 | 5,200 | 4,300
Other Operating Expenses | 810,400 |  | 779,500 | 1,644,600 | 1,538,800
Operating Income | 0 |  | 500 | 0 | 1,000
Interest Expense | 58,600 |  | 34,400 | 113,300 | 66,400
Impairment of Offshore Wind Investment |  |  | 0 |  | 0
Other Income, Net | (448,900) |  | (74,600) | (1,063,000) | (625,300)
Net Income Attributable to Common Shareholders | (390,300) |  | (39,700) | (949,700) | (557,900)
Cash Flows Used for Investments in Plant |  |  |  | 0 | 0
Assets | (28,726,000) | (26,678,500) |  | (28,726,000) |
Electric Distribution | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 1,966,300 |  | 2,054,400 | 4,228,000 | 4,643,000
Depreciation and Amortization | (34,900) |  | 82,100 | (144,600) | 60,000
Other Operating Expenses | (1,713,600) |  | (1,905,200) | (3,618,700) | (4,247,400)
Operating Income | 217,800 |  | 231,300 | 464,700 | 455,600
Interest Expense | (90,900) |  | (68,200) | (173,400) | (137,600)
Impairment of Offshore Wind Investment |  |  | 0 |  | 0
Other Income, Net | 67,000 |  | 47,900 | 123,500 | 102,100
Net Income Attributable to Common Shareholders | 149,700 |  | 165,500 | 317,900 | 331,000
Cash Flows Used for Investments in Plant |  |  |  | 883,600 | 817,300
Assets | 30,943,900 | 29,426,400 |  | 30,943,900 |
Natural Gas Distribution | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 393,500 |  | 409,100 | 1,299,500 | 1,454,300
Depreciation and Amortization | (50,100) |  | (41,700) | (133,200) | (118,700)
Other Operating Expenses | (295,200) |  | (339,400) | (849,800) | (1,069,800)
Operating Income | 48,200 |  | 28,000 | 316,500 | 265,800
Interest Expense | (22,300) |  | (21,500) | (46,800) | (42,700)
Impairment of Offshore Wind Investment |  |  | 0 |  | 0
Other Income, Net | 10,900 |  | 9,700 | 21,000 | 18,700
Net Income Attributable to Common Shareholders | 27,100 |  | 11,700 | 217,600 | 181,900
Cash Flows Used for Investments in Plant |  |  |  | 467,900 | 371,500
Assets | 9,036,600 | 8,775,300 |  | 9,036,600 |
Electric Transmission | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 534,100 |  | 480,100 | 1,041,900 | 938,800
Depreciation and Amortization | (98,800) |  | (92,000) | (199,800) | (181,900)
Other Operating Expenses | (147,100) |  | (136,200) | (289,000) | (264,500)
Operating Income | 288,200 |  | 251,900 | 553,100 | 492,400
Interest Expense | (46,000) |  | (42,200) | (86,900) | (83,700)
Impairment of Offshore Wind Investment |  |  | 0 |  | 0
Other Income, Net | 12,200 |  | 9,500 | 26,300 | 18,900
Net Income Attributable to Common Shareholders | 189,000 |  | 161,000 | 365,700 | 316,100
Cash Flows Used for Investments in Plant |  |  |  | 668,100 | 636,900
Assets | 15,417,300 | 14,806,500 |  | 15,417,300 |
Water Distribution | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 57,500 |  | 58,100 | 107,700 | 108,300
Depreciation and Amortization | (10,800) |  | (14,100) | (11,500) | (27,400)
Other Operating Expenses | (30,900) |  | (28,600) | (63,000) | (56,500)
Operating Income | 15,800 |  | 15,400 | 33,200 | 24,400
Interest Expense | (9,700) |  | (9,200) | (21,100) | (18,600)
Impairment of Offshore Wind Investment |  |  | 0 |  | 0
Other Income, Net | 600 |  | 1,500 | 2,300 | 2,700
Net Income Attributable to Common Shareholders | 8,000 |  | $ 9,300 | 13,400 | 10,800
Cash Flows Used for Investments in Plant |  |  |  | 75,700 | $ 74,700
Assets | $ 3,018,600 | $ 2,944,800 |  | $ 3,018,600 |

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