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Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 6 $ 8
Interest cost 19 15
Expected return on plan assets (19) (25)
Amortization of net loss 7 7
Settlement cost (benefit) 1 0
Net periodic cost (benefit) 14 5
Total contributions expected in current year 7  
Total contributions to the plans during the period 2  
Pension Benefits | Houston Electric    
Defined Benefit Plan Disclosure [Line Items]    
Total contributions expected in current year 0  
Total contributions to the plans during the period 0  
Pension Benefits | CERC    
Defined Benefit Plan Disclosure [Line Items]    
Total contributions expected in current year 0  
Total contributions to the plans during the period 0  
Other Postretirement Benefits Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 1
Interest cost 3 2
Expected return on plan assets (1) (1)
Amortization of prior service cost (credit) 0 (1)
Amortization of net loss (2) (1)
Net periodic cost (benefit) 0 0
Total contributions expected in current year 8  
Total contributions to the plans during the period 2  
Other Postretirement Benefits Plan | Houston Electric    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 1 1
Expected return on plan assets (1) (1)
Amortization of prior service cost (credit) (1) (1)
Amortization of net loss (1) (1)
Net periodic cost (benefit) (2) (2)
Total contributions expected in current year 1  
Total contributions to the plans during the period 0  
Other Postretirement Benefits Plan | CERC    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 1 1
Expected return on plan assets 0 0
Amortization of prior service cost (credit) 1 0
Amortization of net loss (1) 0
Net periodic cost (benefit) 1 $ 1
Total contributions expected in current year 4  
Total contributions to the plans during the period $ 1