Business Segment Information (Segment Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Financial Information
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,595,522			$ 4,218,615			$ 9,422,607	$ 10,491,737
Income taxes (benefits)	226,997			184,112			282,818	(109,034)
Consolidated net income	669,714	$ 392,014	$ 312,299	555,882	$ 164,011	$ 279,593	1,374,026	999,486
Assets	60,552,147						60,552,147		$ 58,595,191
Utility [Member]
Segment Financial Information
Revenue from Contract with Customer, Excluding Assessed Tax	3,559,240			4,156,616			9,325,977	10,191,041
Income taxes (benefits)	225,989			178,088			304,352	(118,257)
Consolidated net income	754,036			667,162			1,666,701	1,166,866
Assets	64,924,653						64,924,653		61,399,243
Corporate and Other
Segment Financial Information
Revenue from Contract with Customer, Excluding Assessed Tax	36,302			62,009			96,661	300,720
Income taxes (benefits)	1,008			6,024			(21,534)	9,223
Consolidated net income	(3,304)			(55,870)			(74,257)	(36,772)
Assets	839,217						839,217		884,442
Eliminations
Segment Financial Information
Revenue from Contract with Customer, Excluding Assessed Tax	(20)			(10)			(31)	(24)
Income taxes (benefits)	0			0			0	0
Consolidated net income	(81,018)			$ (55,410)			(218,418)	$ (130,608)
Assets	$ (5,211,723)						$ (5,211,723)		$ (3,688,494)