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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | $ 2,572,641 | $ 2,122,538 | $ 6,043,951 | $ 4,948,378 |
Depreciation and Amortization | (364,600) | (280,200) | (891,000) | (659,000) |
Other Operating Expenses | (1,752,400) | (1,390,700) | (4,034,400) | (3,252,200) |
Operating Income | 455,569 | 451,605 | 1,118,623 | 1,037,173 |
Interest Expense | (160,090) | (145,435) | (313,334) | (283,201) |
Other Income, Net | 93,861 | 46,619 | 165,422 | 80,820 |
Net Income Attributable to Common Shareholders | 291,862 | 264,520 | 735,309 | 630,663 |
Cash Flows Used for Investments in Plant |  |  | 1,549,081 | 1,423,223 |
Assets | 49,916,240 |  | 49,916,240 |  | $ 48,492,144
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 335,700 | 330,000 | 719,300 | 673,000 |
Depreciation and Amortization | (33,200) | (28,400) | (63,400) | (55,700) |
Other Operating Expenses | (279,400) | (285,700) | (610,900) | (585,200) |
Operating Income | 23,100 | 15,900 | 45,000 | 32,100 |
Interest Expense | (53,500) | (41,800) | (100,300) | (83,400) |
Other Income, Net | 354,300 | 309,200 | 850,200 | 733,400 |
Net Income Attributable to Common Shareholders | 316,000 | 282,700 | 784,700 | 677,600 |
Cash Flows Used for Investments in Plant |  |  | 122,700 | 109,900 |
Assets | 23,833,900 |  | 23,833,900 |  | 22,674,700
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | (695,900) | (659,800) | (1,405,700) | (1,304,900) |
Depreciation and Amortization | 1,600 | 1,100 | 3,300 | 2,100 |
Other Operating Expenses | 692,100 | 660,300 | 1,400,800 | 1,305,200 |
Operating Income | (2,200) | 1,600 | (1,600) | 2,400 |
Interest Expense | 16,300 | 12,800 | 26,400 | 24,400 |
Other Income, Net | (335,400) | (304,800) | (828,500) | (725,800) |
Net Income Attributable to Common Shareholders | (321,300) | (290,400) | (803,700) | (699,000) |
Cash Flows Used for Investments in Plant |  |  | 0 | 0 |
Assets | (23,038,200) |  | (23,038,200) |  | (21,738,600)
Electric Distribution | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 2,004,400 | 1,676,500 | 4,390,700 | 3,576,900 |
Depreciation and Amortization | (198,100) | (132,300) | (549,700) | (354,300) |
Other Operating Expenses | (1,636,100) | (1,360,300) | (3,481,700) | (2,890,800) |
Operating Income | 170,200 | 183,900 | 359,300 | 331,800 |
Interest Expense | (60,300) | (61,100) | (119,800) | (114,400) |
Other Income, Net | 53,000 | 29,900 | 100,500 | 50,600 |
Net Income Attributable to Common Shareholders | 129,000 | 121,600 | 269,900 | 214,900 |
Cash Flows Used for Investments in Plant |  |  | 541,800 | 510,400 |
Assets | 26,238,100 |  | 26,238,100 |  | 25,411,200
Natural Gas Distribution | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 416,200 | 311,800 | 1,343,800 | 1,092,300 |
Depreciation and Amortization | (39,100) | (34,600) | (91,100) | (80,300) |
Other Operating Expenses | (360,700) | (257,700) | (1,018,000) | (793,600) |
Operating Income | 16,400 | 19,500 | 234,700 | 218,400 |
Interest Expense | (16,700) | (14,600) | (32,500) | (28,500) |
Other Income, Net | 10,600 | 4,600 | 20,800 | 8,500 |
Net Income Attributable to Common Shareholders | 7,700 | 4,100 | 171,700 | 151,600 |
Cash Flows Used for Investments in Plant |  |  | 275,400 | 305,900 |
Assets | 7,351,400 |  | 7,351,400 |  | 7,215,900
Electric Transmission | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 457,600 | 411,200 | 892,800 | 811,900 |
Depreciation and Amortization | (83,300) | (74,500) | (165,300) | (148,000) |
Other Operating Expenses | (141,300) | (121,900) | (270,500) | (237,300) |
Operating Income | 233,000 | 214,800 | 457,000 | 426,600 |
Interest Expense | (37,500) | (32,600) | (70,600) | (65,300) |
Other Income, Net | 9,300 | 6,800 | 18,200 | 12,200 |
Net Income Attributable to Common Shareholders | 151,500 | 137,600 | 300,000 | 273,000 |
Cash Flows Used for Investments in Plant |  |  | 543,600 | 443,200 |
Assets | 12,938,600 |  | 12,938,600 |  | 12,377,800
Water Distribution | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 54,600 | 52,800 | 103,100 | 99,200 |
Depreciation and Amortization | (12,500) | (11,500) | (24,800) | (22,800) |
Other Operating Expenses | (27,000) | (25,400) | (54,100) | (50,500) |
Operating Income | 15,100 | 15,900 | 24,200 | 25,900 |
Interest Expense | (8,400) | (8,100) | (16,500) | (16,000) |
Other Income, Net | 2,100 | 900 | 4,200 | 1,900 |
Net Income Attributable to Common Shareholders | 9,000 | $ 8,900 | 12,700 | 12,600 |
Cash Flows Used for Investments in Plant |  |  | 65,600 | $ 53,800 |
Assets | $ 2,592,400 |  | $ 2,592,400 |  | $ 2,551,100

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