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SEGMENT INFORMATION - Summary of Segment Information and Segmented Total Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Operating Revenues $ 4,118,355 $ 3,332,575  
Depreciation and Amortization (835,000) (337,600)  
Operations, Excluding Storm Costs  
Corporate Shared Services  
Storm Costs  
Employee Benefits  
Uncollectible Expense  
Total Operations and Maintenance (487,451) (462,964)  
Utilities Operating Expense, Other Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (1,869,500) (1,686,000)  
Operating Income/(Loss) 926,394 845,973  
Interest Expense (300,849) (250,749)  
Interest Income 34,000 30,000  
Other Income, Net 58,300 61,000  
Income Tax (Expense)/Benefit (165,221) (162,526)  
Income Tax (Expense)/Benefit   (162,600)  
Net Income 552,668 523,728  
Net Income Attributable to Noncontrolling Interests (1,880) (1,880)  
Net Income Attributable to Common Shareholders 550,788 521,848  
Cash Flows Used for Investments in Plant 1,007,400 1,149,400  
Assets 60,194,678   $ 59,594,529
Other      
Segment Reporting Information [Line Items]      
Operating Revenues 439,000 443,600  
Depreciation and Amortization (50,600) (45,700)  
Operations, Excluding Storm Costs  
Corporate Shared Services  
Storm Costs  
Employee Benefits  
Uncollectible Expense  
Total Operations and Maintenance (349,100) (348,600)  
Utilities Operating Expense, Other Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (1,400) (900)  
Operating Income/(Loss) 37,900 48,400  
Interest Expense (178,400) (146,100)  
Interest Income 43,400 54,700  
Other Income, Net 625,700 567,900  
Income Tax (Expense)/Benefit 33,400    
Income Tax (Expense)/Benefit   15,500  
Net Income 562,000 540,400  
Net Income Attributable to Noncontrolling Interests 0 0  
Net Income Attributable to Common Shareholders 562,000 540,400  
Cash Flows Used for Investments in Plant 50,600 43,000  
Assets 28,824,600   29,041,100
Eliminations      
Segment Reporting Information [Line Items]      
Operating Revenues (837,800) (836,600)  
Depreciation and Amortization 2,800 2,500  
Operations, Excluding Storm Costs  
Corporate Shared Services  
Storm Costs  
Employee Benefits  
Uncollectible Expense  
Total Operations and Maintenance 441,000 445,700  
Utilities Operating Expense, Other Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency 394,100 388,400  
Operating Income/(Loss) 100 0  
Interest Expense 43,400 54,700  
Interest Income (43,400) (54,700)  
Other Income, Net (621,100) (559,400)  
Income Tax (Expense)/Benefit 0    
Income Tax (Expense)/Benefit   0  
Net Income (621,000) (559,400)  
Net Income Attributable to Noncontrolling Interests 0 0  
Net Income Attributable to Common Shareholders (621,000) (559,400)  
Cash Flows Used for Investments in Plant 0 0  
Assets (29,600,100)   (29,851,900)
Electric Distribution | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenues 2,777,700 2,261,700  
Depreciation and Amortization (564,700) (109,800)  
Operations, Excluding Storm Costs (101,700) (111,700)  
Corporate Shared Services (116,400) (112,500)  
Storm Costs (19,900) (26,400)  
Employee Benefits (48,600) (44,900)  
Uncollectible Expense (43,700) (35,400)  
Other (27,400) (17,200)  
Total Operations and Maintenance (357,700) (348,100)  
Utilities Operating Expense, Other Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (1,580,600) (1,557,000)  
Operating Income/(Loss) 274,700 246,800  
Interest Expense (91,100) (82,500)  
Interest Income 27,300 24,500  
Other Income, Net 35,300 32,100  
Income Tax (Expense)/Benefit (56,600)    
Income Tax (Expense)/Benefit   (51,600)  
Net Income 189,600 169,300  
Net Income Attributable to Noncontrolling Interests (1,200) (1,200)  
Net Income Attributable to Common Shareholders 188,400 168,100  
Cash Flows Used for Investments in Plant 489,600 471,300  
Assets 32,280,600   32,031,900
Natural Gas Distribution | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenues 1,141,400 906,000  
Depreciation and Amortization (104,500) (83,000)  
Operations, Excluding Storm Costs (46,200) (42,600)  
Corporate Shared Services (30,300) (27,000)  
Storm Costs 0 0  
Employee Benefits (18,600) (17,300)  
Uncollectible Expense (30,000) (16,100)  
Other 2,100 (3,100)  
Total Operations and Maintenance (123,000) (106,100)  
Utilities Operating Expense, Other Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (605,200) (448,500)  
Operating Income/(Loss) 308,700 268,400  
Interest Expense (28,400) (24,500)  
Interest Income 6,700 5,400  
Other Income, Net 5,500 4,700  
Income Tax (Expense)/Benefit (74,100)    
Income Tax (Expense)/Benefit   (63,400)  
Net Income 218,400 190,600  
Net Income Attributable to Noncontrolling Interests 0 0  
Net Income Attributable to Common Shareholders 218,400 190,600  
Cash Flows Used for Investments in Plant 193,900 244,800  
Assets 9,955,800   9,786,700
Electric Transmission | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenues 547,800 507,800  
Depreciation and Amortization (106,800) (101,000)  
Operations, Excluding Storm Costs (31,500) (33,000)  
Corporate Shared Services (21,800) (19,500)  
Storm Costs 0 0  
Employee Benefits (11,700) (12,200)  
Uncollectible Expense 0 0  
Other (10,900) (15,700)  
Total Operations and Maintenance (75,900) (80,400)  
Utilities Operating Expense, Other Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (69,600) (61,500)  
Operating Income/(Loss) 295,500 264,900  
Interest Expense (38,600) (40,900)  
Interest Income 0 100  
Other Income, Net 12,100 14,000  
Income Tax (Expense)/Benefit (68,900)    
Income Tax (Expense)/Benefit   (60,700)  
Net Income 200,100 177,400  
Net Income Attributable to Noncontrolling Interests (700) (700)  
Net Income Attributable to Common Shareholders 199,400 176,700  
Cash Flows Used for Investments in Plant 244,800 358,400  
Assets 16,205,600   16,070,900
Water Distribution | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenues 50,300 50,100  
Depreciation and Amortization (11,200) (600)  
Operations, Excluding Storm Costs  
Corporate Shared Services  
Storm Costs  
Employee Benefits  
Uncollectible Expense  
Total Operations and Maintenance (22,800) (25,500)  
Utilities Operating Expense, Other Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (6,800) (6,500)  
Operating Income/(Loss) 9,500 17,500  
Interest Expense (7,700) (11,400)  
Interest Income 0 0  
Other Income, Net 800 1,700  
Income Tax (Expense)/Benefit 1,000    
Income Tax (Expense)/Benefit   (2,400)  
Net Income 3,600 5,400  
Net Income Attributable to Noncontrolling Interests 0 0  
Net Income Attributable to Common Shareholders 3,600 5,400  
Cash Flows Used for Investments in Plant 28,500 $ 31,900  
Assets $ 2,528,200   $ 2,515,800