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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | $ 2,629,342 | $ 2,572,641 | $ 6,424,985 | $ 6,043,951 |
Depreciation and Amortization | (101,500) | (364,600) | (338,500) | (891,000) |
Other Operating Expenses | (1,967,100) | (1,752,400) | (4,776,300) | (4,034,400) |
Operating Income | 560,662 | 455,569 | 1,310,234 | 1,118,623 |
Interest Expense | (207,313) | (160,090) | (401,858) | (313,334) |
Impairment of Offshore Wind Investment | (401,000) | 0 | (401,000) | 0 |
Other Income, Net | 94,875 | 93,861 | 183,857 | 165,422 |
Net Income Attributable to Common Shareholders | 15,422 | 291,862 | 506,581 | 735,309 |
Cash Flows Used for Investments in Plant |  |  | 2,039,512 | 1,549,081 |
Assets | 54,539,745 |  | 54,539,745 |  | $ 53,230,900
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 408,800 | 335,700 | 822,700 | 719,300 |
Depreciation and Amortization | (38,000) | (33,200) | (74,800) | (63,400) |
Other Operating Expenses | (337,200) | (279,400) | (676,900) | (610,900) |
Operating Income | 33,600 | 23,100 | 71,000 | 45,000 |
Interest Expense | (100,600) | (53,500) | (185,700) | (100,300) |
Impairment of Offshore Wind Investment | (401,000) |  | (401,000) |  |
Other Income, Net | 100,900 | 354,300 | 666,800 | 850,200 |
Net Income Attributable to Common Shareholders | (292,400) | 316,000 | 224,700 | 784,700 |
Cash Flows Used for Investments in Plant |  |  | 139,100 | 122,700 |
Assets | 27,475,000 |  | 27,475,000 |  | 26,365,200
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | (781,200) | (695,900) | (1,542,100) | (1,405,700) |
Depreciation and Amortization | 2,200 | 1,600 | 4,300 | 3,300 |
Other Operating Expenses | 779,500 | 692,100 | 1,538,800 | 1,400,800 |
Operating Income | 500 | (2,200) | 1,000 | (1,600) |
Interest Expense | 34,400 | 16,300 | 66,400 | 26,400 |
Impairment of Offshore Wind Investment | 0 |  | 0 |  |
Other Income, Net | (74,600) | (335,400) | (625,300) | (828,500) |
Net Income Attributable to Common Shareholders | (39,700) | (321,300) | (557,900) | (803,700) |
Cash Flows Used for Investments in Plant |  |  | 0 | 0 |
Assets | (25,829,100) |  | (25,829,100) |  | (24,737,500)
Electric Distribution | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 2,054,400 | 2,004,400 | 4,643,000 | 4,390,700 |
Depreciation and Amortization | 82,100 | (198,100) | 60,000 | (549,700) |
Other Operating Expenses | (1,905,200) | (1,636,100) | (4,247,400) | (3,481,700) |
Operating Income | 231,300 | 170,200 | 455,600 | 359,300 |
Interest Expense | (68,200) | (60,300) | (137,600) | (119,800) |
Impairment of Offshore Wind Investment | 0 |  | 0 |  |
Other Income, Net | 47,900 | 53,000 | 102,100 | 100,500 |
Net Income Attributable to Common Shareholders | 165,500 | 129,000 | 331,000 | 269,900 |
Cash Flows Used for Investments in Plant |  |  | 817,300 | 541,800 |
Assets | 27,932,600 |  | 27,932,600 |  | 27,365,000
Natural Gas Distribution | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 409,100 | 416,200 | 1,454,300 | 1,343,800 |
Depreciation and Amortization | (41,700) | (39,100) | (118,700) | (91,100) |
Other Operating Expenses | (339,400) | (360,700) | (1,069,800) | (1,018,000) |
Operating Income | 28,000 | 16,400 | 265,800 | 234,700 |
Interest Expense | (21,500) | (16,700) | (42,700) | (32,500) |
Impairment of Offshore Wind Investment | 0 |  | 0 |  |
Other Income, Net | 9,700 | 10,600 | 18,700 | 20,800 |
Net Income Attributable to Common Shareholders | 11,700 | 7,700 | 181,900 | 171,700 |
Cash Flows Used for Investments in Plant |  |  | 371,500 | 275,400 |
Assets | 8,089,800 |  | 8,089,800 |  | 8,084,900
Electric Transmission | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 480,100 | 457,600 | 938,800 | 892,800 |
Depreciation and Amortization | (92,000) | (83,300) | (181,900) | (165,300) |
Other Operating Expenses | (136,200) | (141,300) | (264,500) | (270,500) |
Operating Income | 251,900 | 233,000 | 492,400 | 457,000 |
Interest Expense | (42,200) | (37,500) | (83,700) | (70,600) |
Impairment of Offshore Wind Investment | 0 |  | 0 |  |
Other Income, Net | 9,500 | 9,300 | 18,900 | 18,200 |
Net Income Attributable to Common Shareholders | 161,000 | 151,500 | 316,100 | 300,000 |
Cash Flows Used for Investments in Plant |  |  | 636,900 | 543,600 |
Assets | 14,054,200 |  | 14,054,200 |  | 13,369,500
Water Distribution | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 58,100 | 54,600 | 108,300 | 103,100 |
Depreciation and Amortization | (14,100) | (12,500) | (27,400) | (24,800) |
Other Operating Expenses | (28,600) | (27,000) | (56,500) | (54,100) |
Operating Income | 15,400 | 15,100 | 24,400 | 24,200 |
Interest Expense | (9,200) | (8,400) | (18,600) | (16,500) |
Impairment of Offshore Wind Investment | 0 |  | 0 |  |
Other Income, Net | 1,500 | 2,100 | 2,700 | 4,200 |
Net Income Attributable to Common Shareholders | 9,300 | $ 9,000 | 10,800 | 12,700 |
Cash Flows Used for Investments in Plant |  |  | 74,700 | $ 65,600 |
Assets | $ 2,817,200 |  | $ 2,817,200 |  | $ 2,783,800

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