Regulatory Matters - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	$ 2,674	$ 3,578
Regulatory assets	161	1,385
Total Non-Current Regulatory Assets	2,513	2,193
Total Regulatory Liabilities	3,247	3,270
Total current regulatory liabilities	39	25
Total Non-Current Regulatory Liabilities	3,208	3,245
Regulatory liabilities related to TCJA
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	1,377	1,436
Estimated removal costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	1,322	1,338
Other Regulatory Assets (Liabilities)
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	548	496
Extraordinary gas costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	86	1,175
Future Amounts Recoverable From Ratepayers
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	765	712
Future Amounts Recoverable From Ratepayers | Benefit obligations
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	379	392
Future Amounts Recoverable From Ratepayers | Asset retirement obligations & other
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	290	237
Future Amounts Recoverable From Ratepayers | Net deferred income taxes
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	96	83
Amounts Deferred For Future Recovery
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	450	1,716
Amounts Deferred For Future Recovery | Extraordinary gas costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets		1,073
Amounts Deferred For Future Recovery | Cost recovery riders
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	113	133
Amounts Deferred For Future Recovery | Hurricane and February 2021 Winter Storm Event restoration costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	149	129
Amounts Deferred For Future Recovery | Other Regulatory Assets (Liabilities)
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	147	129
Amounts Deferred For Future Recovery | Gas recovery costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	27	108
Amounts Deferred For Future Recovery | Decoupling
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	17	3
Amounts Deferred For Future Recovery | COVID-19 incremental costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	12	13
Amounts Deferred For Future Recovery | TEEEF costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	48	182
Amounts Deferred For Future Recovery | Unrecognized equity return
Schedule of Regulatory Assets and Liabilities [Line Items]
Unrecognized equity return	(63)	(54)
Amounts Currently Recovered In Customer Rates
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	1,459	1,150
Amounts Currently Recovered In Customer Rates | Benefit obligations
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	11	18
Amounts Currently Recovered In Customer Rates | Extraordinary gas costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	208	294
Amounts Currently Recovered In Customer Rates | Hurricane and February 2021 Winter Storm Event restoration costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	17	30
Amounts Currently Recovered In Customer Rates | Gas recovery costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	34	79
Amounts Currently Recovered In Customer Rates | TEEEF costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	208
Amounts Currently Recovered In Customer Rates | Unrecognized equity return
Schedule of Regulatory Assets and Liabilities [Line Items]
Unrecognized equity return	(141)	(134)
Amounts Currently Recovered In Customer Rates | Regulatory assets related to TCJA
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	47	47
Amounts Currently Recovered In Customer Rates | Authorized trackers and cost deferrals
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	535	499
Amounts Currently Recovered In Customer Rates | Securitized regulatory assets
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	434	229
Amounts Currently Recovered In Customer Rates | Unamortized loss on reacquired debt and hedging
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	106	88
Amounts Currently Recovered In Customer Rates, Earning Return
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	459
Amounts Currently Recovered In Customer Rates, Not Earning A Return
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	$ 428
Remaining weighted average period for which no return on investment during recovery period is provided	12 years
Houston Electric
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	$ 752	778
Regulatory assets	0	0
Total Non-Current Regulatory Assets	752	778
Total Regulatory Liabilities	1,031	1,155
Total current regulatory liabilities	6	0
Total Non-Current Regulatory Liabilities	1,025	1,155
Houston Electric | Regulatory liabilities related to TCJA
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	695	716
Houston Electric | Estimated removal costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	91	158
Houston Electric | Other Regulatory Assets (Liabilities)
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	245	281
Houston Electric | Future Amounts Recoverable From Ratepayers
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	116	98
Houston Electric | Future Amounts Recoverable From Ratepayers | Benefit obligations
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	0	0
Houston Electric | Future Amounts Recoverable From Ratepayers | Asset retirement obligations & other
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	75	64
Houston Electric | Future Amounts Recoverable From Ratepayers | Net deferred income taxes
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	41	34
Houston Electric | Amounts Deferred For Future Recovery
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	199	322
Houston Electric | Amounts Deferred For Future Recovery | Extraordinary gas costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets		0
Houston Electric | Amounts Deferred For Future Recovery | Cost recovery riders
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	0	0
Houston Electric | Amounts Deferred For Future Recovery | Hurricane and February 2021 Winter Storm Event restoration costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	123	113
Houston Electric | Amounts Deferred For Future Recovery | Other Regulatory Assets (Liabilities)
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	59	46
Houston Electric | Amounts Deferred For Future Recovery | Gas recovery costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	0	0
Houston Electric | Amounts Deferred For Future Recovery | Decoupling
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	0	0
Houston Electric | Amounts Deferred For Future Recovery | COVID-19 incremental costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	8	8
Houston Electric | Amounts Deferred For Future Recovery | TEEEF costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	48	182
Houston Electric | Amounts Deferred For Future Recovery | Unrecognized equity return
Schedule of Regulatory Assets and Liabilities [Line Items]
Unrecognized equity return	(39)	(27)
Houston Electric | Amounts Currently Recovered In Customer Rates
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	437	358
Houston Electric | Amounts Currently Recovered In Customer Rates | Benefit obligations
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	11	18
Houston Electric | Amounts Currently Recovered In Customer Rates | Extraordinary gas costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	0	0
Houston Electric | Amounts Currently Recovered In Customer Rates | Hurricane and February 2021 Winter Storm Event restoration costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	17	30
Houston Electric | Amounts Currently Recovered In Customer Rates | Gas recovery costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	0	0
Houston Electric | Amounts Currently Recovered In Customer Rates | TEEEF costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	208
Houston Electric | Amounts Currently Recovered In Customer Rates | Unrecognized equity return
Schedule of Regulatory Assets and Liabilities [Line Items]
Unrecognized equity return	(36)	(55)
Houston Electric | Amounts Currently Recovered In Customer Rates | Regulatory assets related to TCJA
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	47	47
Houston Electric | Amounts Currently Recovered In Customer Rates | Authorized trackers and cost deferrals
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	44	25
Houston Electric | Amounts Currently Recovered In Customer Rates | Securitized regulatory assets
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	74	229
Houston Electric | Amounts Currently Recovered In Customer Rates | Unamortized loss on reacquired debt and hedging
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	72	64
Houston Electric | Amounts Currently Recovered In Customer Rates, Earning Return
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	365
Houston Electric | Amounts Currently Recovered In Customer Rates, Not Earning A Return
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	$ 72
Remaining weighted average period for which no return on investment during recovery period is provided	28 years
CERC Corp
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	$ 1,011	2,180
Regulatory assets	161	1,336
Total Non-Current Regulatory Assets	850	844
Total Regulatory Liabilities	1,915	1,826
Total current regulatory liabilities	33	25
Total Non-Current Regulatory Liabilities	1,882	1,801
CERC Corp | Regulatory liabilities related to TCJA
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	505	536
CERC Corp | Estimated removal costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	1,150	1,097
CERC Corp | Other Regulatory Assets (Liabilities)
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	260	193
CERC Corp | Extraordinary gas costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	86	1,175
CERC Corp | Future Amounts Recoverable From Ratepayers
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	233	200
CERC Corp | Future Amounts Recoverable From Ratepayers | Benefit obligations
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	5	5
CERC Corp | Future Amounts Recoverable From Ratepayers | Asset retirement obligations & other
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	186	155
CERC Corp | Future Amounts Recoverable From Ratepayers | Net deferred income taxes
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	42	40
CERC Corp | Amounts Deferred For Future Recovery
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	203	1,324
CERC Corp | Amounts Deferred For Future Recovery | Extraordinary gas costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets		1,073
CERC Corp | Amounts Deferred For Future Recovery | Cost recovery riders
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	73	57
CERC Corp | Amounts Deferred For Future Recovery | Hurricane and February 2021 Winter Storm Event restoration costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	26	16
CERC Corp | Amounts Deferred For Future Recovery | Other Regulatory Assets (Liabilities)
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	72	67
CERC Corp | Amounts Deferred For Future Recovery | Gas recovery costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	27	108
CERC Corp | Amounts Deferred For Future Recovery | Decoupling
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	17	3
CERC Corp | Amounts Deferred For Future Recovery | COVID-19 incremental costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	4	5
CERC Corp | Amounts Deferred For Future Recovery | TEEEF costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	0	0
CERC Corp | Amounts Deferred For Future Recovery | Unrecognized equity return
Schedule of Regulatory Assets and Liabilities [Line Items]
Unrecognized equity return	(16)	(5)
CERC Corp | Amounts Currently Recovered In Customer Rates
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	575	656
CERC Corp | Amounts Currently Recovered In Customer Rates | Benefit obligations
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	0	0
CERC Corp | Amounts Currently Recovered In Customer Rates | Extraordinary gas costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	208	294
CERC Corp | Amounts Currently Recovered In Customer Rates | Hurricane and February 2021 Winter Storm Event restoration costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	0	0
CERC Corp | Amounts Currently Recovered In Customer Rates | Gas recovery costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	34	30
CERC Corp | Amounts Currently Recovered In Customer Rates | TEEEF costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	0
CERC Corp | Amounts Currently Recovered In Customer Rates | Unrecognized equity return
Schedule of Regulatory Assets and Liabilities [Line Items]
Unrecognized equity return	(53)	(49)
CERC Corp | Amounts Currently Recovered In Customer Rates | Regulatory assets related to TCJA
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	0	0
CERC Corp | Amounts Currently Recovered In Customer Rates | Authorized trackers and cost deferrals
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	375	369
CERC Corp | Amounts Currently Recovered In Customer Rates | Securitized regulatory assets
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	0	0
CERC Corp | Amounts Currently Recovered In Customer Rates | Unamortized loss on reacquired debt and hedging
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	11	$ 12
CERC Corp | Amounts Currently Recovered In Customer Rates, Earning Return
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	94
CERC Corp | Amounts Currently Recovered In Customer Rates, Not Earning A Return
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	$ 320
Remaining weighted average period for which no return on investment during recovery period is provided	8 years