Business Segment Information (Segment Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Segment Financial Information
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,846,026		$ 3,395,196		$ 5,827,085	$ 6,273,122
Income taxes (benefits)	134,796		(359,643)		55,821	(293,145)
Consolidated net income	392,014	$ 312,299	164,011	$ 279,593	704,312	443,604
Assets	59,717,236				59,717,236		$ 58,595,191
Utility [Member]
Segment Financial Information
Revenue from Contract with Customer, Excluding Assessed Tax	2,818,747		3,306,269		5,766,738	6,034,425
Income taxes (benefits)	144,489		(371,704)		78,363	(296,346)
Consolidated net income	514,498		156,548		912,664	499,704
Assets	64,059,477				64,059,477		61,399,243
All Other [Member]
Segment Financial Information
Revenue from Contract with Customer, Excluding Assessed Tax	27,287		88,933		60,358	238,711
Income taxes (benefits)	(9,693)		12,061		(22,542)	3,201
Consolidated net income	(40,559)		50,714		(70,953)	19,097
Assets	855,229				855,229		884,442
Eliminations
Segment Financial Information
Revenue from Contract with Customer, Excluding Assessed Tax	(8)		(6)		(11)	(14)
Income taxes (benefits)	0		0		0	0
Consolidated net income	(81,925)		$ (43,251)		(137,399)	$ (75,197)
Assets	$ (5,197,470)				$ (5,197,470)		$ (3,688,494)