Revenue from Contracts with Customers - EEGH (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue from External Customer [Line Items]
Operating revenue	$ 7,500	$ 6,968	$ 20,142	$ 19,113
EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	551	457	1,541	1,379
Other revenue	(4)	(1)	(8)	0
Operating revenue	547	456	1,533	1,379
Regulated
Revenue from External Customer [Line Items]
Total Customer Revenue	5,055	4,430	13,159	12,111
Regulated | EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	297	264	868	806
Nonregulated | EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	254	193	673	573
Gas transportation and storage | Regulated
Revenue from External Customer [Line Items]
Total Customer Revenue	118	100	670	707
Gas transportation and storage | Regulated | EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	296	249	867	774
Wholesale | Regulated
Revenue from External Customer [Line Items]
Total Customer Revenue	310	203	733	504
Wholesale | Regulated | EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	0	14	0	31
Other | Regulated
Revenue from External Customer [Line Items]
Total Customer Revenue	24	24	74	80
Other | Regulated | EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	$ 1	$ 1	$ 1	$ 1