XML 137 R108.htm IDEA: XBRL DOCUMENT v3.22.0.1
Short-term Borrowings and Long-term Debt - Schedule of Debt (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
day
Dec. 31, 2020
USD ($)
Long-term debt:    
Unamortized Issuance Costs $ (23) $ (17)
Unamortized Discount (Premium), Net (7) (6)
Long-term Debt 15,558 11,521
Current debt $ 545 1,919
Number of days until commercial paper maturity | day 60  
CenterPoint Energy    
Long-term debt:    
Number of days until commercial paper maturity | day 60  
CERC Corp    
Long-term debt:    
Unamortized Issuance Costs $ (15) (15)
Unamortized Discount (Premium), Net (4) (4)
Long-term Debt 4,380 2,428
Current debt $ 7 24
Number of days until commercial paper maturity | day 30  
Houston Electric    
Long-term debt:    
Unamortized Issuance Costs $ (36) (28)
Unamortized Discount (Premium), Net (18) (14)
Long-term Debt 4,975 4,406
Current debt $ 520 613
VUHI    
Long-term debt:    
Number of days until commercial paper maturity | day 30  
Subordinated Debt ZENS Member    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 2.00%  
Long-term debt:    
Long-Term $ 0 0
Current 10 15
CenterPoint Energy senior notes 0.68% to 4.25% due 2024 to 2049    
Long-term debt:    
Long-Term 3,650 2,700
Current $ 0 500
CenterPoint Energy senior notes 0.68% to 4.25% due 2024 to 2049 | Minimum | CenterPoint Energy    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 0.68%  
CenterPoint Energy senior notes 0.68% to 4.25% due 2024 to 2049 | Maximum | CenterPoint Energy    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 4.25%  
Variable rate term loan    
Long-term debt:    
Long-Term $ 0 0
Current $ 0 700
Variable rate term loan | CenterPoint Energy    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 0.865%  
Bonds Pollution Control Due    
Long-term debt:    
Long-Term $ 68 68
Current $ 0 0
Bonds Pollution Control Due | CenterPoint Energy    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 5.125%  
Commercial paper    
Long-term debt:    
Long-Term $ 1,400 1,078
Current 0 0
Commercial paper | CERC Corp    
Long-term debt:    
Long-Term 899 347
Commercial paper | VUHI    
Long-term debt:    
Long-Term 350 92
Current 0 0
VUHI Senior Notes | CERC Corp    
Long-term debt:    
Long-Term 3,500 2,100
VUHI Senior Notes | VUHI    
Long-term debt:    
Long-Term 377 377
Current $ 0 55
VUHI Senior Notes | Minimum | CERC Corp    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 0.62%  
VUHI Senior Notes | Minimum | VUHI    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 3.72%  
VUHI Senior Notes | Maximum | CERC Corp    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 6.625%  
VUHI Senior Notes | Maximum | VUHI    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 6.10%  
Other Debt    
Long-term debt:    
Long-Term $ 4 6
Current $ 3 12
First mortgage bonds | Houston Electric    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 9.15%  
Long-term debt:    
Long-Term $ 0 0
Current 0 102
General mortgage bonds | Houston Electric    
Long-term debt:    
Long-Term 4,712 3,912
Current $ 300 300
General mortgage bonds | Minimum | Houston Electric    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 2.25%  
General mortgage bonds | Maximum | Houston Electric    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 6.95%  
System restoration bonds | Houston Electric    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 4.243%  
Long-term debt:    
Long-Term $ 0 69
Current 70 66
Transition bonds | Houston Electric    
Long-term debt:    
Long-Term 317 467
Current $ 150 145
Transition bonds | Maximum | Houston Electric    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 3.028%  
Senior Notes | IGC    
Long-term debt:    
Long-Term $ 96 96
Current $ 0 0
Senior Notes | Minimum | IGC    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 6.34%  
Senior Notes | Maximum | IGC    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 7.08%  
SIGECO first mortgage bonds    
Long-term debt:    
Long-Term $ 288 293
Current $ 5 $ 0
SIGECO first mortgage bonds | Minimum | SIGECO    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 0.82%  
SIGECO first mortgage bonds | Maximum | SIGECO    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 6.72%  
Third Party AMAs | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Arkansas and Oklahoma Natural Gas Businesses    
Long-term debt:    
Outstanding obligations related to third party AMAs $ 36  
Third Party AMAs | CERC Corp | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Arkansas and Oklahoma Natural Gas Businesses    
Long-term debt:    
Outstanding obligations related to third party AMAs $ 36