Revenue from Contract with Customer - EEGH (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from External Customer [Line Items]
Total operating revenue	$ 26,337	$ 25,150	$ 20,952
EEGH
Revenue from External Customer [Line Items]
Customer revenue	2,009	1,866	2,087
Other revenue	(3)	4	3
Total operating revenue	2,006	1,870	2,090
Regulated assets | Retail Gas
Revenue from External Customer [Line Items]
Customer revenue	1,022	974	619
Regulated assets | Wholesale
Revenue from External Customer [Line Items]
Customer revenue	1,024	727	366
Regulated assets | Other
Revenue from External Customer [Line Items]
Customer revenue	105	109	110
Regulated assets | EEGH
Revenue from External Customer [Line Items]
Customer revenue	1,188	1,099	1,289
Regulated assets | EEGH | Retail Gas
Revenue from External Customer [Line Items]
Customer revenue	1,179	1,044	1,242
Regulated assets | EEGH | Wholesale
Revenue from External Customer [Line Items]
Customer revenue	8	57	43
Regulated assets | EEGH | Other
Revenue from External Customer [Line Items]
Customer revenue	1	(2)	4
Nonregulated assets | EEGH
Revenue from External Customer [Line Items]
Customer revenue	$ 821	$ 767	$ 798