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Equity (CenterPoint Energy) (Tables)
 12 Months Ended
Dec. 31, 2020
Stockholders' Equity Note [Abstract]  
Dividends Declared [Table Text Block]
CenterPoint Energy declared and paid dividends on its Common Stock during 2020, 2019 and 2018 as presented in the table below:
Declaration DateRecord DatePayment Date
Per Share (1)
Total
(in millions)
December 10, 2020February 18, 2021March 11, 2021$0.1600 $88 
October 29, 2020November 19, 2020December 10, 20200.1500 83 
July 29, 2020August 20, 2020September 10, 20200.1500 82 
April 24, 2020May 21, 2020June 11, 20200.1500 82 
February 3, 2020February 20, 2020March 12, 20200.2900 145 
Total 2020$0.9000 $480 
October 17, 2019November 21, 2019December 12, 2019$0.2875 $144 
July 31, 2019August 15, 2019September 12, 20190.2875 145 
April 25, 2019May 16, 2019June 13, 20190.2875 144 
Total 2019$0.8625 $433 
Declaration DateRecord DatePayment Date
Per Share (1)
Total
(in millions)
December 12, 2018February 21, 2019March 14, 2019$0.2875 $144 
October 23, 2018November 15, 2018December 13, 20180.2775 139 
July 26, 2018August 16, 2018September 13, 20180.2775 120 
April 26, 2018May 17, 2018June 14, 20180.2775 120 
Total 2018$1.1200 $523 
(1)On April 1, 2020, in response to the reduction in cash flow related to the reduction in Enable quarterly common unit distributions announced by Enable on April 1, 2020, CenterPoint Energy announced a reduction of its quarterly Common Stock dividend per share from $0.2900 to $0.1500.

CenterPoint Energy declared and paid dividends on its Series A Preferred Stock during 2020, 2019 and 2018 as presented in the table below:
Declaration DateRecord DatePayment DatePer ShareTotal
(in millions)
December 10, 2020February 15, 2021March 1, 2021$30.6250 $24 
July 29, 2020August 14, 2020September 1, 202030.6250 24 
February 3, 2020February 14, 2020March 2, 202030.6250 25 
Total 2020$91.8750 $73 
July 31, 2019August 15, 2019September 3, 2019$30.6250 $24 
Total 2019$30.6250 $24 
December 12, 2018February 15, 2019March 1, 2019$32.1563 $26 
Total 2018$32.1563 $26 

CenterPoint Energy declared dividends on its Series B Preferred Stock during 2020, 2019 and 2018 as presented in the table below:
Declaration DateRecord DatePayment DatePer ShareTotal
(in millions)
December 10, 2020February 15, 2021March 1, 2021$17.5000 $17 
October 29, 2020November 13, 2020December 1, 202017.5000 17 
July 29, 2020August 14, 2020September 1, 202017.5000 17 
April 24, 2020May 15, 2020June 1, 202017.5000 17 
February 3, 2020February 14, 2020March 2, 202017.5000 17 
Total 2020$87.5000 $85 
October 17, 2019November 15, 2019December 2, 2019$17.5000 $17 
July 31, 2019August 15, 2019September 3, 201917.5000 17 
April 25, 2019May 15, 2019June 3, 201917.5000 17 
Total 2019$52.5000 $51 
December 12, 2018February 15, 2019March 1, 2019$17.5000 $17 
October 23, 2018November 15, 2018December 1, 201811.6667 11 
Total 2018$29.1667 $28 
CenterPoint Energy declared and paid dividends on its Series C Preferred Stock during 2020 as presented in the table below:
Declaration Date(1)Record DatePayment DatePer ShareTotal
(in millions)
December 10, 2020February 18, 2021March 11, 2021$0.1600 $7 
October 29, 2020November 19, 2020December 10, 20200.1500 6 
July 29, 2020August 20, 2020September 10, 20200.1500 7 
April 24, 2020May 21, 2020June 11, 20200.1500 7 
Total 2020$0.6100 $27 

(1)Declaration date for dividends on Common Stock. The Series C Preferred Stock is entitled to participate in any dividend or distribution (excluding those payable in Common Stock) with the Common Stock on a pari passu, pro rata, as-converted basis. The per share amount reflects the dividend per share of Common Stock as if the Series C Preferred Stock were converted into Common Stock. The Series C Preferred Stock are expected to convert to Common Stock on or around May 7, 2021.

There were no Series C Preferred Stock outstanding or dividends declared in 2019 or 2018.

Dividend Requirement on Preferred Stock
Year Ended December 31,
202020192018
(in millions)
Series A Preferred Stock$49 $49 $18 
Series B Preferred Stock68 68 17 
Series C Preferred Stock27 — — 
Preferred dividend requirement
144 117 35 
Amortization of beneficial conversion feature32 — — 
Total income allocated to preferred shareholders
$176 $117 $35 
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Amounts recognized in accumulated other comprehensive loss (gain) consist of the following:
 December 31,
 20202019
 Pension
Benefits		Postretirement
Benefits		Pension
Benefits		Postretirement
Benefits
CenterPoint EnergyCenterPoint EnergyCERCCenterPoint EnergyCenterPoint EnergyCERC
 (in millions)
Unrecognized actuarial loss (gain)$109 $(14)$(12)$105 $(16)$(12)
Unrecognized prior service cost— 7 7 — 7 7 
Net amount recognized in accumulated other comprehensive loss (gain)
$109 $(7)$(5)$105 $(9)$(5)
Changes in accumulated comprehensive income (loss) are as follows:
Year Ended December 31,
20202019
CenterPoint EnergyHouston ElectricCERCCenterPoint EnergyHouston ElectricCERC
(in millions)
Beginning Balance$(98)$(15)$10 $(108)$(14)$5 
Other comprehensive income (loss) before reclassifications:
Remeasurement of pension and other postretirement plans(12)— — 7 — 7 
Deferred loss from interest rate derivatives (1)
— — — (3)(1)— 
Reclassified to earnings— — — 1 — — 
Other comprehensive loss from unconsolidated affiliates(2)— — (1)— — 
Amounts reclassified from accumulated other comprehensive loss:
Prior service cost (2)
— — 1 1 — — 
Actuarial losses (2)
7 — — 8 — — 
Reclassification of deferred loss from cash flow hedges (3)
19 19 — — — — 
Tax benefit (expense)(4)(4)(1)(3)— (2)
Net current period other comprehensive income (loss)8 15 — 10 (1)5 
Ending Balance$(90)$— $10 $(98)$(15)$10 

(1)Gains and losses are reclassified from Accumulated other comprehensive income into income when the hedged transactions affect earnings. The reclassification amounts are included in Interest and other finance charges in each of the Registrant’s respective Statements of Consolidated Income. Amounts are $-0- and $1 million for the years ended December 31, 2020 and 2019, respectively.

(2)Amounts are included in the computation of net periodic cost and are reflected in Other, net in each of the Registrants’ respective Statements of Consolidated Income.

(3)The cost of debt approved by the PUCT as part of Houston Electric’s Stipulation and Settlement Agreement included unrealized gains and losses on interest rate hedges. Accordingly, deferred gains and losses on interest rate hedges were reclassified to regulatory assets or liabilities, as appropriate.
Convertible Debt [Table Text Block]
The following table illustrates the conversion rate per share of the Series B Preferred Stock, subject to certain anti-dilution adjustments:
Applicable Market Value of the Common StockConversion Rate per Share of Series B Preferred Stock
Greater than $32.6990 (threshold appreciation price)
30.5820 shares of Common Stock
Equal to or less than $32.6990 but greater than or equal to $27.2494
Between 30.5820 and 36.6980 shares of Common Stock, determined by dividing $1,000 by the applicable market value
Less than $27.2494 (initial price)
36.6980 shares of Common Stock

The following table illustrates the conversion rate per depositary share, subject to certain anti-dilution adjustments:
Applicable Market Value of the Common StockConversion Rate per Depository Share
Greater than $32.6990 (threshold appreciation price)
1.5291 shares of Common Stock
Equal to or less than $32.6990 but greater than or equal to $27.2494
Between 1.5291 and 1.8349 shares of Common Stock, determined by dividing $50 by the applicable market value
Less than $27.2494 (initial price)
1.8349 shares of Common Stock