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Short-term Borrowings and Long-term Debt (Tables)
 3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Line of Credit Facilities [Table Text Block] Credit Facilities. In February 2021, each of CenterPoint Energy, Houston Electric, CERC Corp. and VUHI replaced their existing revolving credit facilities with new amended and restated credit facilities. The size of the CenterPoint Energy facility decreased from $3.3 billion to $2.4 billion, while the sizes of the Houston Electric, CERC Corp. and VUHI facilities remained unchanged.
The Registrants had the following revolving credit facilities as of March 31, 2021:
Execution
 Date 		RegistrantSize of
Facility
Draw Rate of LIBOR plus (1)
Financial Covenant Limit on Debt for Borrowed Money to Capital Ratio 
Debt for Borrowed Money to Capital
Ratio as of
March 31, 2021 (2)
Termination Date
(in millions)
February 4, 2021CenterPoint Energy $2,400 1.625%65.0%(3)57.4%February 4, 2024
February 4, 2021
CenterPoint Energy (4)
400 1.250%65.0%49.9%February 4, 2024
February 4, 2021Houston Electric300 1.375%67.5%(3)57.9%February 4, 2024
February 4, 2021CERC 900 1.250%65.0%61.5%February 4, 2024
Total
$4,000 

(1)Based on current credit ratings.
(2)As defined in the revolving credit facility agreements, excluding Securitization Bonds.
(3)For CenterPoint Energy and Houston Electric, the financial covenant limit will temporarily increase to 70% if Houston Electric experiences damage from a natural disaster in its service territory and CenterPoint Energy certifies to the administrative agent that Houston Electric has incurred system restoration costs reasonably likely to exceed $100 million in a consecutive 12-month period, all or part of which Houston Electric intends to seek to recover through securitization financing. Such temporary increase in the financial covenant would be in effect from the date CenterPoint Energy delivers its certification until the earliest to occur of (i) the completion of the securitization financing, (ii) the first anniversary of CenterPoint Energy’s certification or (iii) the revocation of such certification.
(4)This credit facility was issued by VUHI, is guaranteed by SIGECO, Indiana Gas and VEDO and includes a $20 million letter of credit sublimit. This credit facility backstops VUHI’s commercial paper program.

The Registrants, including the subsidiaries of CenterPoint Energy discussed above, were in compliance with all financial debt covenants as of March 31, 2021.

The table below reflects the utilization of the Registrants’ respective revolving credit facilities:
March 31, 2021December 31, 2020
RegistrantLoansLetters
of Credit		Commercial
Paper		Weighted Average Interest RateLoansLetters
of Credit		Commercial
Paper		Weighted Average Interest Rate
(in millions, except weighted average interest rate)
CenterPoint Energy (1)
$— $11 $772 0.21 %$— $11 $1,078 0.23 %
CenterPoint Energy (2)
— — 210 0.18 %— — 92 0.22 %
Houston Electric— — — — %— — — — %
CERC — — 573 0.21 %— — 347 0.23 %
Total$— $11 $1,555 $— $11 $1,517 

(1)CenterPoint Energy’s outstanding commercial paper generally has maturities of 60 days or less.
(2)This credit facility was issued by VUHI and is guaranteed by SIGECO, Indiana Gas and VEDO.