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SEGMENT INFORMATION - Schedule of Segment Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | $ 9,863,085 | $ 8,904,430 | $ 8,526,470
Depreciation and Amortization | (1,335,000) | (1,159,100) | (1,080,700)
Impairment of Northern Pass Transmission | 0 | 0 | (239,644)
Other Operating Expenses | (6,534,800) | (5,756,600) | (5,615,700)
Operating Income | 1,993,321 | 1,988,734 | 1,590,491
Interest Expense | (582,334) | (538,452) | (533,197)
Interest Income | 25,600 | 4,800 | 12,800
Other Income, Net | 135,700 | 103,800 | 120,000
Income Tax (Expense)/Benefit | (344,223) | (346,186) | (273,499)
Net Income | 1,228,046 | 1,212,686 | 916,572
Net Income Attributable to Noncontrolling Interests | (7,519) | (7,519) | (7,519)
Net Income Attributable to Common Shareholders | 1,220,527 | 1,205,167 | 909,053
Total Assets (as of) | 48,492,144 | 46,099,598 |
Cash Flows Used for Investments in Plant | 3,175,080 | 2,942,996 | 2,911,489
Operating Segments | Electric Distribution |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 7,423,600 | 7,132,300 | 6,976,500
Depreciation and Amortization | (737,800) | (657,000) | (651,300)
Impairment of Northern Pass Transmission |  |  | 0
Other Operating Expenses | (5,970,000) | (5,642,300) | (5,525,100)
Operating Income | 715,800 | 833,000 | 800,100
Interest Expense | (236,400) | (216,000) | (206,400)
Interest Income | 20,700 | 3,200 | 13,300
Other Income, Net | 78,100 | 58,000 | 46,800
Income Tax (Expense)/Benefit | (103,500) | (129,600) | (135,900)
Net Income | 474,700 | 548,600 | 517,900
Net Income Attributable to Noncontrolling Interests | (4,600) | (4,600) | (4,600)
Net Income Attributable to Common Shareholders | 470,100 | 544,000 | 513,300
Total Assets (as of) | 25,411,200 | 24,981,900 |
Cash Flows Used for Investments in Plant | 1,053,300 | 1,079,000 | 1,104,200
Operating Segments | Natural Gas Distribution |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 1,789,600 | 1,208,700 | 1,062,200
Depreciation and Amortization | (142,300) | (87,900) | (68,300)
Impairment of Northern Pass Transmission |  |  | 0
Other Operating Expenses | (1,345,400) | (913,800) | (830,800)
Operating Income | 301,900 | 207,000 | 163,100
Interest Expense | (58,600) | (40,000) | (47,400)
Interest Income | 4,500 | 900 | 100
Other Income, Net | 17,900 | 3,100 | 1,600
Income Tax (Expense)/Benefit | (60,900) | (36,900) | (21,200)
Net Income | 204,800 | 134,100 | 96,200
Net Income Attributable to Noncontrolling Interests | 0 | 0 | 0
Net Income Attributable to Common Shareholders | 204,800 | 134,100 | 96,200
Total Assets (as of) | 7,215,900 | 6,450,500 |
Cash Flows Used for Investments in Plant | 721,100 | 494,400 | 460,200
Operating Segments | Electric Transmission |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 1,634,600 | 1,536,100 | 1,389,000
Depreciation and Amortization | (300,300) | (278,100) | (253,300)
Impairment of Northern Pass Transmission |  |  | (239,600)
Other Operating Expenses | (496,200) | (470,000) | (411,200)
Operating Income | 838,100 | 788,000 | 484,900
Interest Expense | (133,200) | (126,800) | (125,700)
Interest Income | 2,200 | 4,700 | 1,500
Other Income, Net | 19,800 | 23,300 | 29,200
Income Tax (Expense)/Benefit | (179,400) | (183,800) | (130,500)
Net Income | 547,500 | 505,400 | 259,400
Net Income Attributable to Noncontrolling Interests | (2,900) | (2,900) | (2,900)
Net Income Attributable to Common Shareholders | 544,600 | 502,500 | 256,500
Total Assets (as of) | 12,377,800 | 11,695,000 |
Cash Flows Used for Investments in Plant | 1,024,100 | 1,004,600 | 987,000
Operating Segments | Water Distribution |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 211,300 | 215,400 | 214,600
Depreciation and Amortization | (46,100) | (44,200) | (46,900)
Impairment of Northern Pass Transmission |  |  | 0
Other Operating Expenses | (101,400) | (86,600) | (101,000)
Operating Income | 63,800 | 84,600 | 66,700
Interest Expense | (32,000) | (32,900) | (34,600)
Interest Income | 0 | 0 | 0
Other Income, Net | 3,300 | 2,000 | 400
Income Tax (Expense)/Benefit | 1,700 | (12,500) | 2,400
Net Income | 36,800 | 41,200 | 34,900
Net Income Attributable to Noncontrolling Interests | 0 | 0 | 0
Net Income Attributable to Common Shareholders | 36,800 | 41,200 | 34,900
Total Assets (as of) | 2,551,100 | 2,375,200 |
Cash Flows Used for Investments in Plant | 137,200 | 118,800 | 118,000
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 1,354,000 | 1,235,900 | 1,028,500
Depreciation and Amortization | (113,100) | (93,500) | (63,200)
Impairment of Northern Pass Transmission |  |  | 0
Other Operating Expenses | (1,170,400) | (1,071,900) | (891,300)
Operating Income | 70,500 | 70,500 | 74,000
Interest Expense | (168,800) | (161,000) | (170,300)
Interest Income | 46,000 | 37,800 | 48,700
Other Income, Net | 1,363,900 | 1,382,900 | 945,300
Income Tax (Expense)/Benefit | (2,100) | 16,600 | 11,700
Net Income | 1,309,500 | 1,346,800 | 909,400
Net Income Attributable to Noncontrolling Interests | 0 | 0 | 0
Net Income Attributable to Common Shareholders | 1,309,500 | 1,346,800 | 909,400
Total Assets (as of) | 22,674,700 | 22,089,400 |
Cash Flows Used for Investments in Plant | 239,400 | 246,200 | 242,100
Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | (2,550,000) | (2,424,000) | (2,144,300)
Depreciation and Amortization | 4,600 | 1,600 | 2,300
Impairment of Northern Pass Transmission |  |  | 0
Other Operating Expenses | 2,548,600 | 2,428,000 | 2,143,700
Operating Income | 3,200 | 5,600 | 1,700
Interest Expense | 46,600 | 38,300 | 51,200
Interest Income | (47,800) | (41,800) | (50,800)
Other Income, Net | (1,347,300) | (1,365,500) | (903,300)
Income Tax (Expense)/Benefit | 0 | 0 | 0
Net Income | (1,345,300) | (1,363,400) | (901,200)
Net Income Attributable to Noncontrolling Interests | 0 | 0 | 0
Net Income Attributable to Common Shareholders | (1,345,300) | (1,363,400) | (901,200)
Total Assets (as of) | (21,738,600) | (21,492,400) |
Cash Flows Used for Investments in Plant | $ 0 | $ 0 | $ 0

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