Supplementary Financial Information - Schedule of Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
NDT net income (loss)	$ 107	$ 40	$ 97	$ 75
Insurance settlements	80	0	80	1
Gain on sale of land	0	0	0	1
Gain on TRA settlement	0	0	0	10
Interest income	4	18	10	41
All other	0	1	(1)	18
Total other income, net	191	59	186	146
Other income, net	191	$ 59	$ 186	$ 146
Martin Lake Incident | ERCOT
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total other income, net	80
Other income, net	$ 80