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Revenue from Contracts with Customers - EEGH (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Revenue from External Customer [Line Items]
Operating revenue	$ 6,672	$ 6,366
EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	646	577
Other revenue	6	1
Operating revenue	652	578
Contract liability	38		$ 43
Contract liability, revenue recognized	11	9
Regulated \| EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	341	333
Nonregulated \| EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	305	244
Gas transmission and storage \| Regulated
Revenue from External Customer [Line Items]
Total Customer Revenue	369	358
Gas transmission and storage \| Regulated \| EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	339	332
Wholesale \| Regulated \| EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	$ 2	$ 1