Business Segment Information (Segment Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Segment Financial Information
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,981,059	$ 2,877,925
Income taxes (benefits)	(78,975)	66,497
Consolidated net income	312,299	279,593
Assets	59,203,276		$ 58,595,191
Utility [Member]
Segment Financial Information
Revenue from Contract with Customer, Excluding Assessed Tax	2,947,992	2,728,156
Income taxes (benefits)	(66,126)	75,359
Consolidated net income	398,167	343,156
Assets	63,443,534		61,399,243
All Other [Member]
Segment Financial Information
Revenue from Contract with Customer, Excluding Assessed Tax	33,070	149,777
Income taxes (benefits)	(12,849)	(8,862)
Consolidated net income	(30,394)	(31,617)
Assets	860,341		884,442
Eliminations
Segment Financial Information
Revenue from Contract with Customer, Excluding Assessed Tax	(3)	(8)
Income taxes (benefits)	0	0
Consolidated net income	(55,474)	$ (31,946)
Assets	$ (5,100,599)		$ (3,688,494)