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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 ($) beneficiary | Dec. 31, 2023 USD ($) defined_benefit_plan | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Number Of Additional Plans | defined_benefit_plan |  | 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) | $ (572) | $ (547) |
Discount rate period |  | 99 years |  |
Annuity purchase |  | $ 136 |  |
Changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |  |
Amortization of net loss |  | (1) | (8) |
Amortization of prior service cost |  | (1) | 1 |
Settlement |  | $ 0 | (67) |
Defined Benefit Plan, Funded Plan, Closed |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Number Of Additional Plans | defined_benefit_plan |  | 2 |  |
Defined Benefit Plan, Funded Plan, Frozen |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Number Of Additional Plans | defined_benefit_plan |  | 1 |  |
Pension Plan |  |  |  |
Components of net periodic costs [Abstract] |  |  |  |
Service cost |  | $ 25 | 29 |
Interest cost |  | 76 | 73 | $ 59
Expected return on plan assets |  | (76) | (87) | (103)
Amortization of net loss |  | 28 | 31 | 36
Settlement cost |  | 0 | 126 | 38
Net periodic cost (credit) |  | $ 53 | $ 172 | 69
Assumptions used to determine net periodic benefit (income) cost |  |  |  |
Expected return on plan assets (as a percent) |  | 6.50% | 6.50% |
Change in benefit obligation [Roll Forward] |  |  |  |
Benefit obligation, beginning of year |  | $ 1,553 | $ 2,298 |
Service cost |  | 25 | 29 |
Interest cost |  | 76 | 73 | 59
Benefits paid |  | (147) | (509) |
Actuarial (gain) loss |  | 41 | (338) |
Plan amendment |  | 0 | 0 |
Benefit obligation, end of year | 1,553 | 1,548 | 1,553 | 2,298
Change in plan assets [Rollforward] |  |  |  |
Fair value of plan assets, beginning of year |  | 1,212 | 2,072 |
Employer contributions |  | 32 | 35 |
Benefits paid |  | (147) | (509) |
Actual investment return |  | 107 | (386) |
Fair value of plan assets, end of year | 1,212 | 1,204 | 1,212 | $ 2,072
Funded status, end of year | (341) | (344) | (341) |
Amounts Recognized in Balance Sheets |  |  |  |
Non-current assets | 0 | 4 | 0 |
Current liabilities — other | (7) | (7) | (7) |
Other liabilities — benefit obligations | (334) | (341) | (334) |
Net liability, end of year | $ (341) | $ (344) | $ (341) |
Discount rate (as a percent) | 5.15% | 4.95% | 5.15% |
Rate of increase in compensation levels (as a percent) | 4.99% | 4.97% | 4.99% |
Interest crediting rate (as a percent) | 3.00% | 3.00% | 3.00% |
Pension benefits that have accumulated benefit obligations in excess of plan assets |  |  |  |
Accumulated benefit obligation for all defined benefit pension plans | $ 1,548 | $ 1,544 | $ 1,548 |
Amounts recognized in accumulated other comprehensive loss |  |  |  |
Unrecognized actuarial loss (gain) | 70 | 69 | 70 |
Unrecognized prior service cost | 0 | 0 | 0 |
Net amount recognized in accumulated other comprehensive loss (gain) | 70 | 69 | 70 |
Changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |  |
Net loss (gain) |  | 2 |  |
Amortization of net loss |  | (3) |  |
Amortization of prior service cost |  | 0 |  |
Settlement |  | 0 |  |
Total recognized in comprehensive income |  | (1) |  |
Total expense recognized in net periodic cost and other comprehensive income |  | 52 |  |
Pension Plan | Qualified Plan |  |  |  |
Change in plan assets [Rollforward] |  |  |  |
Employer contributions |  | 24 |  |
Pension benefits that have accumulated benefit obligations in excess of plan assets |  |  |  |
Accumulated benefit obligation | 1,497 | 1,496 | 1,497 |
Projected benefit obligation | 1,502 | 1,500 | 1,502 |
Fair value of plan assets | 1,212 | 1,204 | 1,212 |
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 | 48 | 51 |
Projected benefit obligation | 51 | 48 | 51 |
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) |  | 5.15% | 2.80% | 2.45%
Expected return on plan assets (as a percent) |  | 6.50% | 5.00% | 5.00%
Rate of increase in compensation levels (as a percent) |  | 4.99% | 4.95% | 5.05%
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 |  | $ 1 | $ 2 | $ 2
Interest cost |  | 13 | 9 | 9
Expected return on plan assets |  | (5) | (5) | (4)
Amortization of prior service cost |  | (2) | (3) | (4)
Amortization of net loss |  | 8 | 4 | 0
Net periodic cost (credit) |  | $ (1) | $ (1) | $ 3
Assumptions used to determine net periodic benefit (income) cost |  |  |  |
Discount rate (as a percent) |  | 5.15% | 2.85% | 2.50%
Expected return on plan assets (as a percent) |  | 5.13% | 3.22% | 3.20%
Change in benefit obligation [Roll Forward] |  |  |  |
Benefit obligation, beginning of year |  | $ 263 | $ 336 |
Service cost |  | 1 | 2 | $ 2
Interest cost |  | 13 | 9 | 9
Participant contributions |  | 6 | 6 |
Benefits paid |  | (20) | (20) |
Actuarial (gain) loss |  | 0 | (73) |
Plan amendment |  | 0 | 3 |
Benefit obligation, end of year | 263 | 263 | 263 | 336
Change in plan assets [Rollforward] |  |  |  |
Fair value of plan assets, beginning of year |  | 109 | 132 |
Employer contributions |  | 7 | 8 |
Participant contributions |  | 6 | 6 |
Benefits paid |  | (20) | (20) |
Actual investment return |  | 10 | (17) |
Fair value of plan assets, end of year | 109 | 112 | 109 | 132
Funded status, end of year | (154) | (151) | (154) |
Amounts Recognized in Balance Sheets |  |  |  |
Current liabilities — other | (7) | (7) | (7) |
Other liabilities — benefit obligations | (147) | (144) | (147) |
Net liability, end of year | $ (154) | $ (151) | $ (154) |
Discount rate (as a percent) | 5.15% | 4.95% | 5.15% |
Expected return on plan assets (as a percent) |  | 5.13% | 3.66% |
Pension benefits that have accumulated benefit obligations in excess of plan assets |  |  |  |
Prescription drug cost trend rate assumed for the next year - Pre-65 |  | 9.00% | 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) | $ (34) | $ (36) |
Unrecognized prior service cost | 13 | 12 | 13 |
Net amount recognized in accumulated other comprehensive loss (gain) | $ (23) | (22) | $ (23) |
Changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |  |
Net loss (gain) |  | 0 |  |
Amortization of net loss |  | 2 |  |
Amortization of prior service cost |  | (1) |  |
Settlement |  | 0 |  |
Total recognized in comprehensive income |  | 1 |  |
Total expense recognized in net periodic cost and other comprehensive income |  | $ 0 |  |
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% | 7.25% | 6.50% |
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% | 22.76% | 23.66% |
Houston Electric |  |  |  |
Amounts Recognized in Balance Sheets |  |  |  |
Other liabilities — benefit obligations | $ (38) | $ (32) | $ (38) |
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 |  | 5 | 4 | 4
Expected return on plan assets |  | (4) | (4) | (3)
Amortization of prior service cost |  | (5) | (4) | (5)
Amortization of net loss |  | 4 | 2 | 0
Net periodic cost (credit) |  | $ (8) | $ (6) | $ (4)
Assumptions used to determine net periodic benefit (income) cost |  |  |  |
Discount rate (as a percent) |  | 5.15% | 2.85% | 2.50%
Expected return on plan assets (as a percent) |  | 5.26% | 3.32% | 3.30%
Change in benefit obligation [Roll Forward] |  |  |  |
Benefit obligation, beginning of year |  | $ 115 | $ 148 |
Service cost |  | 0 | 0 | $ 0
Interest cost |  | 5 | 4 | 4
Participant contributions |  | 2 | 2 |
Benefits paid |  | (8) | (7) |
Actuarial (gain) loss |  | (1) | (32) |
Plan amendment |  | 0 | 0 |
Benefit obligation, end of year | 115 | 113 | 115 | 148
Change in plan assets [Rollforward] |  |  |  |
Fair value of plan assets, beginning of year |  | 84 | 104 |
Employer contributions |  | 0 | 1 |
Participant contributions |  | 2 | 2 |
Benefits paid |  | (8) | (7) |
Actual investment return |  | 8 | (16) |
Fair value of plan assets, end of year | 84 | 86 | 84 | 104
Funded status, end of year | (31) | (27) | (31) |
Amounts Recognized in Balance Sheets |  |  |  |
Current liabilities — other | 0 | 0 | 0 |
Other liabilities — benefit obligations | (31) | (27) | (31) |
Net liability, end of year | $ (31) | $ (27) | $ (31) |
Discount rate (as a percent) | 5.15% | 4.95% | 5.15% |
Expected return on plan assets (as a percent) |  | 5.26% | 3.75% |
Pension benefits that have accumulated benefit obligations in excess of plan assets |  |  |  |
Prescription drug cost trend rate assumed for the next year - Pre-65 |  | 9.00% | 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% | 7.25% | 6.50% |
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% | 22.76% | 23.66% |
CERC Corp |  |  |  |
Amounts Recognized in Balance Sheets |  |  |  |
Other liabilities — benefit obligations | $ (76) | $ (74) | $ (76) |
Changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |  |
Amortization of net loss |  | (2) | (1) |
Amortization of prior service cost |  | 2 | 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 |  | 5 | 3 | 3
Expected return on plan assets |  | (1) | (1) | (1)
Amortization of prior service cost |  | 2 | 2 | 1
Amortization of net loss |  | 3 | 1 | 0
Net periodic cost (credit) |  | $ 4 | $ 4 | $ 4
Assumptions used to determine net periodic benefit (income) cost |  |  |  |
Discount rate (as a percent) |  | 5.15% | 2.85% | 2.50%
Expected return on plan assets (as a percent) |  | 4.69% | 2.86% | 2.85%
Change in benefit obligation [Roll Forward] |  |  |  |
Benefit obligation, beginning of year |  | $ 92 | $ 118 |
Service cost |  | 1 | 1 | $ 1
Interest cost |  | 5 | 3 | 3
Participant contributions |  | 3 | 3 |
Benefits paid |  | (8) | (8) |
Actuarial (gain) loss |  | 0 | (27) |
Plan amendment |  | 0 | 2 |
Benefit obligation, end of year | 92 | 93 | 92 | 118
Change in plan assets [Rollforward] |  |  |  |
Fair value of plan assets, beginning of year |  | 25 | 29 |
Employer contributions |  | 4 | 4 |
Participant contributions |  | 3 | 3 |
Benefits paid |  | (8) | (8) |
Actual investment return |  | 2 | (3) |
Fair value of plan assets, end of year | 25 | 26 | 25 | 29
Funded status, end of year | (67) | (67) | (67) |
Amounts Recognized in Balance Sheets |  |  |  |
Current liabilities — other | (4) | (4) | (4) |
Other liabilities — benefit obligations | (64) | (63) | (64) |
Net liability, end of year | $ (68) | $ (67) | $ (68) |
Discount rate (as a percent) | 5.15% | 4.95% | 5.15% |
Expected return on plan assets (as a percent) |  | 4.69% | 3.35% |
Pension benefits that have accumulated benefit obligations in excess of plan assets |  |  |  |
Prescription drug cost trend rate assumed for the next year - Pre-65 |  | 9.00% | 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) | $ (27) | $ (28) |
Unrecognized prior service cost | 11 | 10 | 11 |
Net amount recognized in accumulated other comprehensive loss (gain) | $ (17) | (17) | $ (17) |
Changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |  |
Net loss (gain) |  | 1 |  |
Amortization of net loss |  | (2) |  |
Amortization of prior service cost |  | 1 |  |
Settlement |  | 0 |  |
Total recognized in comprehensive income |  | 0 |  |
Total expense recognized in net periodic cost and other comprehensive income |  | $ 4 |  |
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% | 7.25% | 6.50% |
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% | 22.76% | 23.66% |
Operation And Maintenance Expense | Pension Plan |  |  |  |
Components of net periodic costs [Abstract] |  |  |  |
Service cost |  | $ 25 | $ 29 | 39
Change in benefit obligation [Roll Forward] |  |  |  |
Service cost |  | $ 25 | $ 29 | $ 39

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- Definition Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Expected Long-term Rate of Return on Plan Assets + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) From Settlement, Reclassification Adjustment from AOCI, before Tax + References No definition available. + Details
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- Definition Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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