Regulatory Matters - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	$ 3,578	$ 3,716
Total current regulatory assets	1,385	1,395
Total Non-Current Regulatory Assets	2,193	2,321
Total Regulatory Liabilities	3,270	3,174
Total current regulatory liabilities	25	21
Total Non-Current Regulatory Liabilities	3,245	3,153
Regulatory liabilities related to TCJA
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	1,436	1,389
Estimated removal costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	1,338	1,304
Other Regulatory Assets (Liabilities)
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	496	481
Extraordinary gas costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total current regulatory assets	1,175	1,256
Future Amounts Recoverable From Ratepayers
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	712	693
Future Amounts Recoverable From Ratepayers | Benefit obligations
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	392	412
Future Amounts Recoverable From Ratepayers | Asset retirement obligations & other
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	237	240
Future Amounts Recoverable From Ratepayers | Net deferred income taxes
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	83	41
Amounts Deferred For Future Recovery
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	1,716	1,921
Amounts Deferred For Future Recovery | Extraordinary gas costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	1,073	1,528
Amounts Deferred For Future Recovery | Cost recovery riders
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	133	124
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	129	105
Amounts Deferred For Future Recovery | Other Regulatory Assets (Liabilities)
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	129	94
Amounts Deferred For Future Recovery | Gas recovery costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	108	29
Amounts Deferred For Future Recovery | Decoupling
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	3	25
Amounts Deferred For Future Recovery | COVID-19 incremental costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	13	23
Amounts Deferred For Future Recovery | TEEEF costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	182	21
Amounts Deferred For Future Recovery | Unrecognized equity return
Schedule of Regulatory Assets and Liabilities [Line Items]
Unrecognized equity return	(54)	(28)
Amounts Currently Recovered In Customer Rates
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	1,150	1,102
Amounts Currently Recovered In Customer Rates | Benefit obligations
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	18	28
Amounts Currently Recovered In Customer Rates | Extraordinary gas costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	294	66
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	30	43
Amounts Currently Recovered In Customer Rates | Gas recovery costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	79	72
Amounts Currently Recovered In Customer Rates | Unrecognized equity return
Schedule of Regulatory Assets and Liabilities [Line Items]
Unrecognized equity return	(134)	(171)
Amounts Currently Recovered In Customer Rates | Regulatory assets related to TCJA
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	47	48
Amounts Currently Recovered In Customer Rates | Authorized trackers and cost deferrals
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	499	504
Amounts Currently Recovered In Customer Rates | Securitized regulatory assets
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	229	420
Amounts Currently Recovered In Customer Rates | Unamortized loss on reacquired debt and hedging
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	88	92
Amounts Currently Recovered In Customer Rates, Earning Return
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	390
Amounts Currently Recovered In Customer Rates, Not Earning A Return
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	$ 531
Remaining weighted average period for which no return on investment during recovery period is provided	11 years
Houston Electric
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	$ 778	789
Total current regulatory assets	0	0
Total Non-Current Regulatory Assets	778	789
Total Regulatory Liabilities	1,155	1,172
Total current regulatory liabilities	0	20
Total Non-Current Regulatory Liabilities	1,155	1,152
Houston Electric | Regulatory liabilities related to TCJA
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	716	738
Houston Electric | Estimated removal costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	158	229
Houston Electric | Other Regulatory Assets (Liabilities)
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	281	205
Houston Electric | Future Amounts Recoverable From Ratepayers
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	98	74
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	64	45
Houston Electric | Future Amounts Recoverable From Ratepayers | Net deferred income taxes
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	34	29
Houston Electric | Amounts Deferred For Future Recovery
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	322	188
Houston Electric | Amounts Deferred For Future Recovery | Extraordinary gas costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	0	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	113	105
Houston Electric | Amounts Deferred For Future Recovery | Other Regulatory Assets (Liabilities)
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	46	57
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	182	21
Houston Electric | Amounts Deferred For Future Recovery | Unrecognized equity return
Schedule of Regulatory Assets and Liabilities [Line Items]
Unrecognized equity return	(27)	(3)
Houston Electric | Amounts Currently Recovered In Customer Rates
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	358	527
Houston Electric | Amounts Currently Recovered In Customer Rates | Benefit obligations
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	18	24
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	30	43
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 | Unrecognized equity return
Schedule of Regulatory Assets and Liabilities [Line Items]
Unrecognized equity return	(55)	(97)
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	46
Houston Electric | Amounts Currently Recovered In Customer Rates | Authorized trackers and cost deferrals
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	25	24
Houston Electric | Amounts Currently Recovered In Customer Rates | Securitized regulatory assets
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	229	420
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	64	67
Houston Electric | Amounts Currently Recovered In Customer Rates, Earning Return
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	294
Houston Electric | Amounts Currently Recovered In Customer Rates, Not Earning A Return
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	$ 64
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	$ 2,180	2,309
Total current regulatory assets	1,336	1,371
Total Non-Current Regulatory Assets	844	938
Total Regulatory Liabilities	1,826	1,716
Total current regulatory liabilities	25	1
Total Non-Current Regulatory Liabilities	1,801	1,715
CERC Corp | Regulatory liabilities related to TCJA
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	536	573
CERC Corp | Estimated removal costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	1,097	994
CERC Corp | Other Regulatory Assets (Liabilities)
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Liabilities	193	149
CERC Corp | Extraordinary gas costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total current regulatory assets	1,175	1,245
CERC Corp | Future Amounts Recoverable From Ratepayers
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	200	181
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	155	171
CERC Corp | Future Amounts Recoverable From Ratepayers | Net deferred income taxes
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	40	5
CERC Corp | Amounts Deferred For Future Recovery
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	1,324	1,670
CERC Corp | Amounts Deferred For Future Recovery | Extraordinary gas costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	1,073	1,517
CERC Corp | Amounts Deferred For Future Recovery | Cost recovery riders
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	57	51
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	16	0
CERC Corp | Amounts Deferred For Future Recovery | Other Regulatory Assets (Liabilities)
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	67	37
CERC Corp | Amounts Deferred For Future Recovery | Gas recovery costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	108	29
CERC Corp | Amounts Deferred For Future Recovery | Decoupling
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	3	25
CERC Corp | Amounts Deferred For Future Recovery | COVID-19 incremental costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	5	15
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	(5)	(4)
CERC Corp | Amounts Currently Recovered In Customer Rates
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	656	458
CERC Corp | Amounts Currently Recovered In Customer Rates | Benefit obligations
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	0	4
CERC Corp | Amounts Currently Recovered In Customer Rates | Extraordinary gas costs
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	294	66
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	30	59
CERC Corp | Amounts Currently Recovered In Customer Rates | Unrecognized equity return
Schedule of Regulatory Assets and Liabilities [Line Items]
Unrecognized equity return	(49)	(47)
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	2
CERC Corp | Amounts Currently Recovered In Customer Rates | Authorized trackers and cost deferrals
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	369	363
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	12	$ 11
CERC Corp | Amounts Currently Recovered In Customer Rates, Earning Return
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	96
CERC Corp | Amounts Currently Recovered In Customer Rates, Not Earning A Return
Schedule of Regulatory Assets and Liabilities [Line Items]
Total Regulatory Assets	$ 424
Remaining weighted average period for which no return on investment during recovery period is provided	7 years