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Short-term Borrowings and Long-term Debt - Schedule of Debt (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
day
Dec. 31, 2021
USD ($)
Long-term debt:    
Unamortized debt issuance costs $ (15) $ (23)
Unamortized discount and premium, net (6) (7)
Long-term debt 14,836 15,558
Current debt $ 2,020 545
Number of days until commercial paper maturity | day 60  
Third Party | 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
CenterPoint Energy    
Long-term debt:    
Number of days until commercial paper maturity | day 60  
Houston Electric    
Long-term debt:    
Unamortized debt issuance costs $ (50) (36)
Unamortized discount and premium, net (27) (18)
Long-term debt 6,197 4,975
Current debt 156 520
CERC Corp    
Long-term debt:    
Current 1,331  
Unamortized debt issuance costs (22) (15)
Unamortized discount and premium, net (4) (4)
Long-term debt 3,495 5,552
Current debt $ 1,842 7
Number of days until commercial paper maturity | day 30  
CERC Corp | Term Loan    
Long-term debt:    
Current debt $ 500  
CERC Corp | Inventory Financing    
Long-term debt:    
Current debt 11 7
CERC Corp | Third Party    
Long-term debt:    
Current debt 511 7
CERC Corp | Third Party | 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
IGC and VEDO    
Long-term debt:    
Long-term debt $ 1,076  
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 7 10
CenterPoint Energy senior notes 1.45% to 4.61% due 2024 to 2049    
Long-term debt:    
Long-Term 3,050 3,650
Current $ 0 0
CenterPoint Energy senior notes 1.45% to 4.61% due 2024 to 2049 | CenterPoint Energy | Minimum    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 1.45%  
CenterPoint Energy senior notes 1.45% to 4.61% due 2024 to 2049 | CenterPoint Energy | Maximum    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 4.61%  
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 $ 1,770 1,400
Current 0 0
Commercial paper | VUHI    
Long-term debt:    
Long-Term 0 350
Current 0 0
Commercial paper | CERC Corp    
Long-term debt:    
Long-Term 805 899
VUHI Senior Notes | VUHI    
Long-term debt:    
Long-Term 0 377
Current 0 0
VUHI Senior Notes | CERC Corp    
Long-term debt:    
Long-Term 2,620 3,500
Current $ 1,331  
VUHI Senior Notes | CERC Corp | Minimum    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 0.70%  
VUHI Senior Notes | CERC Corp | Maximum    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 6.625%  
SIGECO first mortgage bonds    
Long-term debt:    
Long-Term $ 277 288
Current $ 11 5
SIGECO first mortgage bonds | SIGECO | Minimum    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 0.875%  
SIGECO first mortgage bonds | SIGECO | Maximum    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 6.72%  
Other Debt    
Long-term debt:    
Long-Term $ 0 4
Current 4 3
Third Party | CERC Corp    
Long-term debt:    
Long-term debt 3,495 4,476
General mortgage bonds | Houston Electric    
Long-term debt:    
Long-Term 6,112 4,712
Current $ 0 300
General mortgage bonds | Houston Electric | Minimum    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 2.35%  
General mortgage bonds | Houston Electric | Maximum    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 6.95%  
Other | Houston Electric    
Long-term debt:    
Long-Term $ 1 0
Current $ 0 0
System restoration bonds | Houston Electric    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 4.243%  
Long-term debt:    
Long-Term $ 0 0
Current 0 70
Transition bonds | Houston Electric    
Long-term debt:    
Long-Term 161 317
Current $ 156 150
Transition bonds | Houston Electric | Maximum    
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 | IGC | Minimum    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 6.34%  
Senior Notes | IGC | Maximum    
Debt Instrument [Line Items]    
Debt instrument interest rate (as a percent) 7.08%