Regulatory Matters - EEGH - Regulatory Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Regulatory Liabilities [Line Items]
Total regulatory liabilities	$ 7,369	$ 7,214
Regulatory liabilities, current	299	254
Regulatory liabilities, noncurrent	7,070	6,960
Deferred income taxes
Regulatory Liabilities [Line Items]
Total regulatory liabilities	2,901	3,185
Other postretirement benefit costs
Regulatory Liabilities [Line Items]
Total regulatory liabilities	$ 180	243
Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liability, amortization period	27 years
Total regulatory liabilities	$ 2,578	2,424
EEGH
Regulatory Liabilities [Line Items]
Total regulatory liabilities	722	685
Regulatory liabilities, current	126	40
Regulatory liabilities, noncurrent	596	645
EEGH | Deferred income taxes
Regulatory Liabilities [Line Items]
Total regulatory liabilities	406	468
EEGH | Other postretirement benefit costs
Regulatory Liabilities [Line Items]
Total regulatory liabilities	123	116
EEGH | Provision for rate refunds
Regulatory Liabilities [Line Items]
Total regulatory liabilities	$ 90	0
EEGH | Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liability, amortization period	53 years
Total regulatory liabilities	$ 82	73
Regulatory liabilities, noncurrent	82	73
EEGH | Other
Regulatory Liabilities [Line Items]
Total regulatory liabilities	$ 21	$ 28