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Related Party Transactions (Houston Electric and CERC) (Tables)
 6 Months Ended
Jun. 30, 2021
Related Party Transactions [Abstract]  
Schedule of Money Pool Investment and Borrowing
The table below summarizes CenterPoint Energy money pool activity:
June 30, 2021December 31, 2020
Houston ElectricCERCHouston ElectricCERC
 (in millions, except interest rates)
Money pool investments (borrowings) (1)
$97 $— $(8)$— 
Weighted average interest rate
0.18 %0.18 %0.24 %0.24 %

(1)Included in Accounts and notes receivable (payable)–affiliated companies on Houston Electric’s and CERC’s respective Condensed Consolidated Balance Sheets.
Schedule of Related Party Transactions
Amounts charged for these services were as follows and are included primarily in operation and maintenance expenses:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Houston ElectricCERCHouston ElectricCERCHouston ElectricCERCHouston ElectricCERC
(in millions)
Corporate service charges$47 $52 $45 $49 $90 $102 $94 $104 
Net affiliate service charges (billings)(1)1 (4)4 (2)2 (10)10 

The table below presents transactions among Houston Electric, CERC and their parent, CenterPoint Energy.
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Houston ElectricCERCHouston ElectricCERCHouston ElectricCERCHouston ElectricCERC
(in millions)
Cash dividends paid to parent$— $— $20 $40 $— $— $405 $72 
Capital distribution to parent associated with the sale of CES
— — — 286 — — — 286