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Stock-Based Incentive Compensation Plans and Employee Benefit Plans - Pension and Postretirement Benefits (Details) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2022 USD ($) beneficiary defined_benefit_plan	Dec. 31, 2022 USD ($) defined_benefit_plan	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number Of Additional Plans | defined_benefit_plan	3	3
Components of net periodic costs [Abstract]
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other income (expense), net	Other income (expense), net	Other income (expense), net
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]		Other income (expense), net	Other income (expense), net	Other income (expense), net
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other income (expense), net	Other income (expense), net	Other income (expense), net
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other income (expense), net	Other income (expense), net	Other income (expense), net
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other income (expense), net	Other income (expense), net	Other income (expense), net
Amounts Recognized in Balance Sheets
Other liabilities — benefit obligations	$ (547)	$ (547)	$ (511)
Discount rate period		99 years
Annuity purchase		$ 136
Changes in plan assets and benefit obligations recognized in other comprehensive income
Amortization of net loss		(8)	(7)
Amortization of prior service cost		1	(1)
Settlement		$ (67)	(4)
Defined Benefit Plan, Funded Plan, Closed
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number Of Additional Plans | defined_benefit_plan	2	2
Defined Benefit Plan, Funded Plan, Frozen
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number Of Additional Plans | defined_benefit_plan	1	1
Pension Plan
Components of net periodic costs [Abstract]
Service cost		$ 29	38
Interest cost		73	59	$ 75
Expected return on plan assets		(87)	(103)	(112)
Amortization of net loss		31	36	41
Settlement cost		126	38	2
Net periodic cost (credit)		$ 172	$ 69	49
Assumptions used to determine net periodic benefit (income) cost
Expected return on plan assets (as a percent)		6.50%	5.00%
Change in benefit obligation [Roll Forward]
Benefit obligation, beginning of year		$ 2,298	$ 2,507
Service cost		29	38
Interest cost		73	59	75
Benefits paid		(509)	(285)
Actuarial (gain) loss		(338)	(22)
Plan amendment		0	1
Benefit obligation, end of year	$ 1,553	1,553	2,298	2,507
Change in plan assets [Rollforward]
Fair value of plan assets, beginning of year		2,072	2,135
Employer contributions		35	61
Benefits paid		(509)	(285)
Actual investment return		(386)	161
Fair value of plan assets, end of year	1,212	1,212	2,072	$ 2,135
Funded status, end of year	(341)	(341)	(226)
Amounts Recognized in Balance Sheets
Non-current assets	0	0	6
Current liabilities — other	(7)	(7)	(7)
Other liabilities — benefit obligations	(334)	(334)	(225)
Net liability, end of year	$ (341)	$ (341)	$ (226)
Discount rate (as a percent)	5.15%	5.15%	2.80%
Rate of increase in compensation levels (as a percent)	4.99%	4.99%	4.95%
Interest crediting rate (as a percent)	3.00%	3.00%	2.25%
Pension benefits that have accumulated benefit obligations in excess of plan assets
Accumulated benefit obligation for all defined benefit pension plans	$ 1,548	$ 1,548	$ 2,278
Amounts recognized in accumulated other comprehensive loss
Unrecognized actuarial loss (gain)	70	70	99
Unrecognized prior service cost	0	0	0
Net amount recognized in accumulated other comprehensive loss (gain)	70	70	99
Changes in plan assets and benefit obligations recognized in other comprehensive income
Net loss (gain)		45
Amortization of net loss		(7)
Amortization of prior service cost		0
Settlement		(67)
Total recognized in comprehensive income		(29)
Total expense recognized in net periodic cost and other comprehensive income		142
Pension Plan | Qualified Plan
Change in plan assets [Rollforward]
Employer contributions		27
Pension benefits that have accumulated benefit obligations in excess of plan assets
Accumulated benefit obligation	1,497	1,497	2,216
Projected benefit obligation	1,502	1,502	2,237
Fair value of plan assets	1,212	1,212	2,072
Pension Plan | Nonqualified Plan
Change in plan assets [Rollforward]
Employer contributions		8
Pension benefits that have accumulated benefit obligations in excess of plan assets
Accumulated benefit obligation	51	51	62
Projected benefit obligation	51	51	62
Fair value of plan assets	0	$ 0	$ 0
Pension Plan | CenterPoint Energy
Defined Benefit Plan Disclosure [Line Items]
Decrease in benefit obligation from transfer	138
Decrease in plan assets	$ 136
Change in benefit obligation (as a percent)		9.40%
Number of beneficiaries | beneficiary	1,119
Assumptions used to determine net periodic benefit (income) cost
Discount rate (as a percent)		2.80%	2.45%	3.20%
Expected return on plan assets (as a percent)		5.00%	5.00%	5.75%
Rate of increase in compensation levels (as a percent)		4.95%	5.05%	4.95%
Pension benefits that have accumulated benefit obligations in excess of plan assets
Settlement charge	$ 47
Other Postretirement Benefits Plan
Components of net periodic costs [Abstract]
Service cost		$ 2	$ 2	$ 2
Interest cost		9	9	11
Expected return on plan assets		(5)	(4)	(5)
Amortization of prior service cost		(3)	(4)	(4)
Amortization of net loss		4	0	0
Net periodic cost (credit)		$ (1)	$ 3	$ 4
Assumptions used to determine net periodic benefit (income) cost
Discount rate (as a percent)		2.85%	2.50%	3.25%
Expected return on plan assets (as a percent)		3.22%	3.20%	3.95%
Change in benefit obligation [Roll Forward]
Benefit obligation, beginning of year		$ 336	$ 366
Service cost		2	2	$ 2
Interest cost		9	9	11
Participant contributions		6	7
Benefits paid		(20)	(21)
Early Retiree Reinsurance Program		0	20
Actuarial (gain) loss		(73)	(47)
Plan amendment		3	0
Benefit obligation, end of year	263	263	336	366
Change in plan assets [Rollforward]
Fair value of plan assets, beginning of year		132	134
Employer contributions		8	7
Participant contributions		6	7
Benefits paid		(20)	(21)
Actual investment return		(17)	5
Fair value of plan assets, end of year	109	109	132	134
Funded status, end of year	(154)	(154)	(204)
Amounts Recognized in Balance Sheets
Current liabilities — other	(7)	(7)	(7)
Other liabilities — benefit obligations	(147)	(147)	(197)
Net liability, end of year	$ (154)	$ (154)	$ (204)
Discount rate (as a percent)	5.15%	5.15%	2.85%
Expected return on plan assets (as a percent)		3.66%	3.22%
Pension benefits that have accumulated benefit obligations in excess of plan assets
Prescription drug cost trend rate assumed for the next year - Pre-65		8.00%	8.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50%	4.50%	4.50%
Amounts recognized in accumulated other comprehensive loss
Unrecognized actuarial loss (gain)	$ (36)	$ (36)	$ (23)
Unrecognized prior service cost	13	13	13
Net amount recognized in accumulated other comprehensive loss (gain)	$ (23)	(23)	$ (10)
Changes in plan assets and benefit obligations recognized in other comprehensive income
Net loss (gain)		(13)
Amortization of net loss		(1)
Amortization of prior service cost		1
Settlement		0
Total recognized in comprehensive income		(13)
Total expense recognized in net periodic cost and other comprehensive income		$ (19)
Minimum | Other Postretirement Benefits Plan
Pension benefits that have accumulated benefit obligations in excess of plan assets
Health care cost trend rate assumed for the next year	6.50%	6.50%	6.00%
Maximum | Other Postretirement Benefits Plan
Pension benefits that have accumulated benefit obligations in excess of plan assets
Health care cost trend rate assumed for the next year	23.66%	23.66%	18.71%
Houston Electric
Amounts Recognized in Balance Sheets
Other liabilities — benefit obligations	$ (38)	$ (38)	$ (55)
Changes in plan assets and benefit obligations recognized in other comprehensive income
Amortization of net loss		0	0
Amortization of prior service cost		0	0
Settlement		0	0
Houston Electric | Pension Plan | Qualified Plan
Change in plan assets [Rollforward]
Employer contributions		0
Houston Electric | Pension Plan | Nonqualified Plan
Change in plan assets [Rollforward]
Employer contributions		0
Houston Electric | Other Postretirement Benefits Plan
Components of net periodic costs [Abstract]
Service cost		0	0	0
Interest cost		4	4	5
Expected return on plan assets		(4)	(3)	(4)
Amortization of prior service cost		(4)	(5)	(5)
Amortization of net loss		2	0	0
Net periodic cost (credit)		$ (6)	$ (4)	$ (4)
Assumptions used to determine net periodic benefit (income) cost
Discount rate (as a percent)		2.85%	2.50%	3.25%
Expected return on plan assets (as a percent)		3.32%	3.30%	4.05%
Change in benefit obligation [Roll Forward]
Benefit obligation, beginning of year		$ 148	$ 168
Service cost		0	0	$ 0
Interest cost		4	4	5
Participant contributions		2	2
Benefits paid		(7)	(9)
Early Retiree Reinsurance Program		0	0
Actuarial (gain) loss		(32)	(22)
Plan amendment		0	5
Benefit obligation, end of year	115	115	148	168
Change in plan assets [Rollforward]
Fair value of plan assets, beginning of year		104	106
Employer contributions		1	1
Participant contributions		2	2
Benefits paid		(7)	(9)
Actual investment return		(16)	4
Fair value of plan assets, end of year	84	84	104	106
Funded status, end of year	(31)	(31)	(44)
Amounts Recognized in Balance Sheets
Current liabilities — other	0	0	0
Other liabilities — benefit obligations	(31)	(31)	(44)
Net liability, end of year	$ (31)	$ (31)	$ (44)
Discount rate (as a percent)	5.15%	5.15%	2.85%
Expected return on plan assets (as a percent)		3.75%	3.32%
Pension benefits that have accumulated benefit obligations in excess of plan assets
Prescription drug cost trend rate assumed for the next year - Pre-65		8.00%	8.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50%	4.50%	4.50%
Houston Electric | Minimum | Other Postretirement Benefits Plan
Pension benefits that have accumulated benefit obligations in excess of plan assets
Health care cost trend rate assumed for the next year	6.50%	6.50%	6.00%
Houston Electric | Maximum | Other Postretirement Benefits Plan
Pension benefits that have accumulated benefit obligations in excess of plan assets
Health care cost trend rate assumed for the next year	23.66%	23.66%	18.71%
CERC Corp
Amounts Recognized in Balance Sheets
Other liabilities — benefit obligations	$ (76)	$ (76)	$ (100)
Changes in plan assets and benefit obligations recognized in other comprehensive income
Amortization of net loss		(1)	0
Amortization of prior service cost		1	(1)
Settlement		0	0
CERC Corp | Pension Plan | Qualified Plan
Change in plan assets [Rollforward]
Employer contributions		0
CERC Corp | Pension Plan | Nonqualified Plan
Change in plan assets [Rollforward]
Employer contributions		0
CERC Corp | Other Postretirement Benefits Plan
Components of net periodic costs [Abstract]
Service cost		1	1	1
Interest cost		3	3	4
Expected return on plan assets		(1)	(1)	(1)
Amortization of prior service cost		2	1	1
Amortization of net loss		1	0	0
Net periodic cost (credit)		$ 4	$ 4	$ 5
Assumptions used to determine net periodic benefit (income) cost
Discount rate (as a percent)		2.85%	2.50%	3.25%
Expected return on plan assets (as a percent)		2.86%	2.85%	3.35%
Change in benefit obligation [Roll Forward]
Benefit obligation, beginning of year		$ 118	$ 122
Service cost		1	1	$ 1
Interest cost		3	3	4
Participant contributions		3	3
Benefits paid		(8)	(8)
Early Retiree Reinsurance Program		0	11
Actuarial (gain) loss		(27)	(14)
Plan amendment		2	0
Benefit obligation, end of year	92	92	118	122
Change in plan assets [Rollforward]
Fair value of plan assets, beginning of year		29	28
Employer contributions		4	4
Participant contributions		3	3
Benefits paid		(8)	(8)
Actual investment return		(3)	2
Fair value of plan assets, end of year	25	25	29	28
Funded status, end of year	(67)	(67)	(89)
Amounts Recognized in Balance Sheets
Current liabilities — other	(4)	(4)	(4)
Other liabilities — benefit obligations	(64)	(64)	(85)
Net liability, end of year	$ (68)	$ (68)	$ (89)
Discount rate (as a percent)	5.15%	5.15%	2.85%
Expected return on plan assets (as a percent)		3.35%	2.86%
Pension benefits that have accumulated benefit obligations in excess of plan assets
Prescription drug cost trend rate assumed for the next year - Pre-65		8.00%	8.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50%	4.50%	4.50%
Amounts recognized in accumulated other comprehensive loss
Unrecognized actuarial loss (gain)	$ (28)	$ (28)	$ (18)
Unrecognized prior service cost	11	11	12
Net amount recognized in accumulated other comprehensive loss (gain)	$ (17)	(17)	$ (6)
Changes in plan assets and benefit obligations recognized in other comprehensive income
Net loss (gain)		(16)
Amortization of net loss		(1)
Amortization of prior service cost		1
Settlement		0
Total recognized in comprehensive income		(16)
Total expense recognized in net periodic cost and other comprehensive income		$ (15)
CERC Corp | Minimum | Other Postretirement Benefits Plan
Pension benefits that have accumulated benefit obligations in excess of plan assets
Health care cost trend rate assumed for the next year	6.50%	6.50%	6.00%
CERC Corp | Maximum | Other Postretirement Benefits Plan
Pension benefits that have accumulated benefit obligations in excess of plan assets
Health care cost trend rate assumed for the next year	23.66%	23.66%	18.71%
Operation And Maintenance Expense | Pension Plan
Components of net periodic costs [Abstract]
Service cost		$ 29	$ 39	43
Change in benefit obligation [Roll Forward]
Service cost		$ 29	$ 39	$ 43

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Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate, Annualized Individual Rate, Period

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The assumed prescription drug cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of prescription drugs currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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