Regulatory Matters - EEGH - Regulatory Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Regulatory Assets [Line Items]
Total regulatory assets	$ 5,565	$ 5,062
Regulatory assets, current	1,398	1,319
Regulatory assets, noncurrent	4,167	3,743
Regulatory assets not earning a return on investment	3,200	2,300
EEGH
Regulatory Assets [Line Items]
Total regulatory assets	54	48
Regulatory assets, current	9	8
Regulatory assets, noncurrent	45	40
Regulatory assets not earning a return on investment	$ 48	44
EEGH | Employee benefit plans
Regulatory Assets [Line Items]
Regulatory asset, amortization period	11 years
Total regulatory assets	$ 33	32
EEGH | Other
Regulatory Assets [Line Items]
Total regulatory assets	$ 21	$ 16