Revenue from Contracts with Customers - EEGH (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue from External Customer [Line Items]
Total Customer Revenue	$ 5,138	$ 4,357	$ 14,049	$ 11,190
Operating revenue	6,968	6,193	19,113	15,332
EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	457	530	1,377	1,594
Operating revenue	456	531	1,379	1,597
Regulated
Revenue from External Customer [Line Items]
Total Customer Revenue	4,430	3,927	12,111	10,109
Regulated | EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	264	337	804	988
Nonregulated | EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	193	193	573	606
Regulated gas transportation and storage [Member] | Regulated
Revenue from External Customer [Line Items]
Total Customer Revenue	100	84	707	422
Regulated gas transportation and storage [Member] | Regulated | EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	249	311	774	957
Wholesale | Regulated
Revenue from External Customer [Line Items]
Total Customer Revenue	203	130	504	266
Wholesale | Regulated | EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	14	25	31	27
Regulated other [Member] | Regulated
Revenue from External Customer [Line Items]
Total Customer Revenue	24	42	80	89
Regulated other [Member] | Regulated | EEGH
Revenue from External Customer [Line Items]
Total Customer Revenue	1	1	(1)	4
Other revenue
Revenue from External Customer [Line Items]
Operating revenue	87	94	326	314
Other revenue | EEGH
Revenue from External Customer [Line Items]
Operating revenue	$ (1)	$ 1	$ 2	$ 3