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Revenue from Contracts with Customers - EEGH (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Operating revenue	$ 6,686	$ 6,394	$ 13,358	$ 12,760
EEGH
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total Customer Revenue	548	507	1,194	1,084
Other revenue	3	0	9	1
Operating revenue	551	507	1,203	1,085
Contract liability	30		30		$ 43
Contract liability, revenue recognized			17	12
Regulated \| EEGH
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total Customer Revenue	301	285	642	618
Nonregulated \| EEGH
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total Customer Revenue	247	222	552	466
Gas transmission and storage \| Regulated
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total Customer Revenue	119	127	488	485
Gas transmission and storage \| Regulated \| EEGH
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total Customer Revenue	301	285	640	617
Wholesale \| Regulated \| EEGH
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Total Customer Revenue	$ 0	$ 0	$ 2	$ 1