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Related Party Transactions (Houston Electric and CERC) (Tables)
 3 Months Ended
Mar. 31, 2022
Related Party Transactions [Abstract]  
Schedule of Money Pool Investment and Borrowing
The table below summarizes CenterPoint Energy money pool activity:
March 31, 2022December 31, 2021
Houston ElectricCERCHouston ElectricCERC
 (in millions, except interest rates)
Money pool investments (borrowings) (1)
$354 $— $(512)$(224)
Weighted average interest rate
0.55 %0.55 %0.34 %0.34 %

(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 March 31,
20222021
Houston ElectricCERCHouston ElectricCERC
(in millions)
Corporate service charges$39 $45 $43 $50 
Net affiliate service charges (billings)(6)6 (1)1 

The table below presents transactions among Houston Electric, CERC and their parent, CenterPoint Energy.
Three Months Ended March 31,
20222021
Houston ElectricCERCHouston ElectricCERC
(in millions)
Cash dividends paid to parent$37 $23 $— $— 
Cash dividend paid to parent related to the sale of the Arkansas and Oklahoma Natural Gas businesses— 720 — — 
Cash contribution from parent 637 — — — 
Non-cash capital contribution from parent in payment for property, plant and equipment below38 46 — — 
Payable to parent for property, plant and equipment below52 41 — — 
Property, plant and equipment from parent (1)
90 87 — — 

(1) Property, plant and equipment purchased from CenterPoint Energy at its net carrying value on the date of purchase.