Revenue from Contract with Customer - EEGH (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from External Customer [Line Items]
Total operating revenue	$ 25,602	$ 26,337	$ 25,150
EEGH
Revenue from External Customer [Line Items]
Customer revenue	2,055	2,009	1,866
Other revenue	4	(3)	4
Total operating revenue	2,059	2,006	1,870
Regulated assets | Retail Gas
Revenue from External Customer [Line Items]
Customer revenue	873	1,022	974
Regulated assets | Wholesale
Revenue from External Customer [Line Items]
Customer revenue	553	1,024	727
Regulated assets | Other
Revenue from External Customer [Line Items]
Customer revenue	136	105	109
Regulated assets | EEGH
Revenue from External Customer [Line Items]
Customer revenue	1,237	1,188	1,099
Regulated assets | EEGH | Retail Gas
Revenue from External Customer [Line Items]
Customer revenue	1,210	1,179	1,044
Regulated assets | EEGH | Wholesale
Revenue from External Customer [Line Items]
Customer revenue	22	8	57
Regulated assets | EEGH | Other
Revenue from External Customer [Line Items]
Customer revenue	5	1	(2)
Nonregulated assets | EEGH
Revenue from External Customer [Line Items]
Customer revenue	$ 818	$ 821	$ 767