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SEGMENT INFORMATION - Summary of Segment Information and Segmented Total Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | $ 2,791,482 |  | $ 3,215,645 | $ 9,216,467 | $ 9,259,596 |
Depreciation and Amortization | (185,500) |  | (413,400) | (524,000) | (1,304,400) |
Other Operating Expenses | (2,075,400) |  | (2,244,900) | (6,851,700) | (6,279,300) |
Operating Income/(Loss) | 530,553 |  | 557,293 | 1,840,787 | 1,675,917 |
Interest Expense | (222,283) |  | (178,174) | (624,140) | (491,509) |
Impairment of Offshore Wind Investment | 0 | $ (401,000) | 0 | (401,000) | 0 |
Other Income, Net | 79,123 |  | 89,831 | 262,980 | 255,253 |
Net Income/(Loss) Attributable to Common Shareholders | 339,663 |  | 349,409 | 846,245 | 1,084,717 |
Cash Flows Used for Investments in Plant |  |  |  | 3,125,617 | 2,352,743 |
Assets | 56,293,343 |  |  | 56,293,343 |  | $ 53,230,900
Other |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | 394,700 |  | 343,500 | 1,217,300 | 1,062,700 |
Depreciation and Amortization | (40,700) |  | (35,400) | (115,500) | (98,800) |
Other Operating Expenses | (315,700) |  | (265,700) | (992,600) | (876,500) |
Operating Income/(Loss) | 38,300 |  | 42,400 | 109,200 | 87,400 |
Interest Expense | (111,400) |  | (69,600) | (297,000) | (169,900) |
Impairment of Offshore Wind Investment |  |  |  | (401,000) |  |
Other Income, Net | 415,900 |  | 429,900 | 1,082,600 | 1,280,100 |
Net Income/(Loss) Attributable to Common Shareholders | 397,000 |  | 379,000 | 621,600 | 1,163,600 |
Cash Flows Used for Investments in Plant |  |  |  | 207,100 | 177,600 |
Assets | 29,019,000 |  |  | 29,019,000 |  | 26,365,200
Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | (753,000) |  | (682,500) | (2,295,100) | (2,088,100) |
Depreciation and Amortization | 2,300 |  | 1,800 | 6,600 | 5,100 |
Other Operating Expenses | 751,200 |  | 681,100 | 2,290,000 | 2,081,900 |
Operating Income/(Loss) | 500 |  | 400 | 1,500 | (1,100) |
Interest Expense | 38,400 |  | 20,000 | 104,800 | 46,300 |
Impairment of Offshore Wind Investment |  |  |  | 0 |  |
Other Income, Net | (412,700) |  | (423,000) | (1,038,000) | (1,251,500) |
Net Income/(Loss) Attributable to Common Shareholders | (373,800) |  | (402,600) | (931,700) | (1,206,300) |
Cash Flows Used for Investments in Plant |  |  |  | 0 | 0 |
Assets | (27,549,600) |  |  | (27,549,600) |  | (24,737,500)
Electric Distribution | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | 2,371,300 |  | 2,795,100 | 7,014,300 | 7,185,800 |
Depreciation and Amortization | (700) |  | (256,900) | 59,300 | (806,700) |
Other Operating Expenses | (2,124,000) |  | (2,261,500) | (6,371,400) | (5,743,200) |
Operating Income/(Loss) | 246,600 |  | 276,700 | 702,200 | 635,900 |
Interest Expense | (76,800) |  | (64,500) | (214,400) | (184,200) |
Impairment of Offshore Wind Investment |  |  |  | 0 |  |
Other Income, Net | 53,500 |  | 59,600 | 155,700 | 160,100 |
Net Income/(Loss) Attributable to Common Shareholders | 173,300 |  | 225,100 | 504,300 | 495,000 |
Cash Flows Used for Investments in Plant |  |  |  | 1,230,300 | 823,900 |
Assets | 28,840,900 |  |  | 28,840,900 |  | 27,365,000
Natural Gas Distribution | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | 218,300 |  | 225,600 | 1,672,600 | 1,569,400 |
Depreciation and Amortization | (38,000) |  | (25,100) | (156,700) | (116,200) |
Other Operating Expenses | (211,100) |  | (226,300) | (1,280,800) | (1,244,300) |
Operating Income/(Loss) | (30,800) |  | (25,800) | 235,100 | 208,900 |
Interest Expense | (19,700) |  | (18,800) | (62,400) | (51,200) |
Impairment of Offshore Wind Investment |  |  |  | 0 |  |
Other Income, Net | 9,200 |  | 11,100 | 27,900 | 31,900 |
Net Income/(Loss) Attributable to Common Shareholders | (33,700) |  | (24,600) | 148,200 | 147,200 |
Cash Flows Used for Investments in Plant |  |  |  | 536,800 | 424,500 |
Assets | 8,404,500 |  |  | 8,404,500 |  | 8,084,900
Electric Transmission | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | 491,600 |  | 468,800 | 1,430,400 | 1,361,600 |
Depreciation and Amortization | (94,500) |  | (85,100) | (276,400) | (250,300) |
Other Operating Expenses | (144,900) |  | (143,700) | (409,400) | (414,300) |
Operating Income/(Loss) | 252,200 |  | 240,000 | 744,600 | 697,000 |
Interest Expense | (43,000) |  | (36,600) | (126,700) | (107,300) |
Impairment of Offshore Wind Investment |  |  |  | 0 |  |
Other Income, Net | 11,900 |  | 10,100 | 30,800 | 28,300 |
Net Income/(Loss) Attributable to Common Shareholders | 160,300 |  | 155,800 | 476,400 | 455,800 |
Cash Flows Used for Investments in Plant |  |  |  | 1,011,300 | 823,300 |
Assets | 14,693,400 |  |  | 14,693,400 |  | 13,369,500
Water Distribution | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | 68,600 |  | 65,100 | 177,000 | 168,200 |
Depreciation and Amortization | (13,900) |  | (12,700) | (41,300) | (37,500) |
Other Operating Expenses | (30,900) |  | (28,800) | (87,500) | (82,900) |
Operating Income/(Loss) | 23,800 |  | 23,600 | 48,200 | 47,800 |
Interest Expense | (9,800) |  | (8,700) | (28,400) | (25,200) |
Impairment of Offshore Wind Investment |  |  |  | 0 |  |
Other Income, Net | 1,300 |  | 2,100 | 4,000 | 6,400 |
Net Income/(Loss) Attributable to Common Shareholders | 16,600 |  | $ 16,700 | 27,400 | 29,400 |
Cash Flows Used for Investments in Plant |  |  |  | 140,100 | $ 103,400 |
Assets | $ 2,885,100 |  |  | $ 2,885,100 |  | $ 2,783,800

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