Financial Information by Business Segment - Schedule of Segment Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Operating segments information
Segment operating income	$ 603,210	$ (281,840)	$ 2,233,498	$ (96,149)
Unallocated amounts:
Corporate selling, general and administrative	98,720	88,470	271,770	228,730
(Gain) loss on sale/exchange of long-lived assets	(5,623)	10,117	(2,402)	(309,865)
Corporate other operating expenses	34,338	290,174	224,302	354,337
Income from investments	(44,638)	(34,242)	(138,274)	(36,674)
Other income	(472)	(3,960)	(3,711)	(23,596)
Loss on debt extinguishment	1,909	365	19,478	5,651
Interest expense, net	109,929	158,299	333,166	268,390
Income (loss) before income taxes	536,482	(402,302)	2,022,839	(309,920)
MVP Joint Venture | Transmission
Unallocated amounts:
Equity earnings from Company's investments	42,900	35,600	108,900	35,600
Operating Segments
Operating segments information
Segment operating income	658,353	10,440	2,487,061	251,839
Unallocated amounts:
Corporate selling, general and administrative	83,057	79,810	224,279	220,070
(Gain) loss on sale/exchange of long-lived assets	(5,601)	10,117	(2,380)	(309,865)
Corporate other operating expenses	1,884	10,206	36,977	23,650
Operating Segments | Transmission
Operating segments information
Segment operating income	85,387	54,568	278,593	54,568
Unallocated amounts:
Corporate selling, general and administrative	8,728	5,492	26,254	5,492
(Gain) loss on sale/exchange of long-lived assets	0	409	349	409
Corporate other operating expenses	0	0	(536)	0
Intersegment eliminations and other
Operating segments information
Segment operating income	686	0	2,075	0
Unallocated amounts
Operating segments information
Segment operating income	(55,143)	(292,280)	(253,563)	(347,988)
Unallocated revenue	(10)	(20)	(121)	(33)
Unallocated amounts:
Corporate selling, general and administrative	15,663	8,660	47,491	8,660
Corporate depreciation and amortization	6,372	3,672	16,815	8,674
(Gain) loss on sale/exchange of long-lived assets	(22)	0	(22)	0
Corporate other operating expenses	32,454	279,968	187,325	330,687
Income from investments	(44,638)	(34,242)	(138,274)	(36,674)
Other income	(472)	(3,960)	(3,711)	(23,596)
Loss on debt extinguishment	1,909	365	19,478	5,651
Interest expense, net	$ 109,929	$ 158,299	$ 333,166	$ 268,390