Business Segment Information (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Segment Financial Information Abstract
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,794,628	$ 2,981,059
Income Tax Expense (Benefit)	20,994	(78,975)
Consolidated net income	76,536	312,299
Assets	61,629,856		$ 59,703,396
Utility [Member]
Segment Financial Information Abstract
Revenue from Contract with Customer, Excluding Assessed Tax	2,772,173	2,947,992
Income Tax Expense (Benefit)	34,548	(66,126)
Consolidated net income	195,980	398,167
Assets	65,760,486		63,887,038
Corporate and Other [Member]
Segment Financial Information Abstract
Revenue from Contract with Customer, Excluding Assessed Tax	22,476	33,070
Income Tax Expense (Benefit)	(13,554)	(12,849)
Consolidated net income	(39,883)	(30,394)
Assets	892,773		836,598
Eliminations [Member]
Segment Financial Information Abstract
Revenue from Contract with Customer, Excluding Assessed Tax	(21)	(3)
Income Tax Expense (Benefit)	0	0
Consolidated net income	(79,561)	$ (55,474)
Assets	$ (5,023,403)		$ (5,020,240)