Revenue from Contracts with Customers - EEGH (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue from External Customer [Line Items]
Total Customer Revenue	$ 4,719	$ 4,712
Operating revenue	6,030	6,081
EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	488	486
Operating revenue	482	486
Regulated
Revenue from External Customer [Line Items]
Total Customer Revenue	4,115	4,094
Regulated | EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	285	296
Nonregulated | EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	203	190
Gas transportation and storage | Regulated
Revenue from External Customer [Line Items]
Total Customer Revenue	388	498
Gas transportation and storage | Regulated | EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	285	279
Wholesale | Regulated
Revenue from External Customer [Line Items]
Total Customer Revenue	236	193
Wholesale | Regulated | EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	0	17
Other revenue
Revenue from External Customer [Line Items]
Operating revenue	104	137
Other revenue | EEGH
Revenue from External Customer [Line Items]
Operating revenue	$ (6)	$ 0