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Leases (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2024
USD ($)
MW
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Lease, Cost [Abstract]      
Operating lease cost $ 1 $ 2  
Short-term lease cost 2 0  
Total lease cost 3 2  
Operating Leases, Lease Income [Abstract]      
Operating lease income 2 2  
Total lease income 2 2  
Assets and Liabilities, Lessee [Abstract]      
Operating ROU assets 12   $ 13
Finance ROU assets 502   526
Total leased assets 514   539
Current operating lease liability 3   3
Non-current operating lease liability 9   10
Total leased liabilities $ 12   $ 13
Weighted-average remaining lease term (in years) - operating leases 4 years 6 months   4 years 8 months 12 days
Weighted-average discount rate - operating leases 4.15%   4.13%
Weighted-average remaining lease term (in years) - finance leases 5 years 3 months 18 days   5 years 6 months
Weighted-average discount rate - finance leases (as a percent) 3.60%   3.60%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other non-current assets   Other non-current assets
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property, Plant and Equipment, Net   Property, Plant and Equipment, Net
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other current liabilities   Other current liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other non-current liabilities   Other non-current liabilities
Operating Lease Liabilities, Payments Due [Abstract]      
Remainder of 2024 $ 3    
2025 3    
2026 3    
2027 2    
2028 1    
2029 1    
2030 and beyond 1    
Total lease payments 14    
Less: Interest 2    
Present value of lease liabilities 12   $ 13
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]      
Remainder of 2024 5    
2025 7    
2026 7    
2027 7    
2028 7    
2029 7    
2030 and beyond 166    
Total lease payments to be received 206    
Other Information Related to Leases [Abstract]      
Operating cash flows from operating leases included in the measurement of lease liabilities 1 2  
Financing cash flows from finance leases included in the measurement of lease liabilities 0 0  
Houston Electric      
Lease Disclosure [Line Items]      
Expenses associated with short-term lease $ 98   100
Number of megawatts of mobile generation | MW 505    
Escrow deposit $ 92    
Expenses associated with long term lease $ 131   124
Right to terminate, lease costs refunded (as a percent) 75.00%    
Lease, Cost [Abstract]      
Operating lease cost $ 1 1  
Short-term lease cost   (1)  
Short-term lease cost 2    
Total lease cost 3 0  
Operating Leases, Lease Income [Abstract]      
Operating lease income 0 0  
Total lease income 0 0  
Assets and Liabilities, Lessee [Abstract]      
Operating ROU assets 5   6
Finance ROU assets 502   526
Total leased assets 507   532
Current operating lease liability 1   1
Non-current operating lease liability 4   5
Total leased liabilities $ 5   $ 6
Weighted-average remaining lease term (in years) - operating leases 3 years 7 months 6 days   3 years 10 months 24 days
Weighted-average discount rate - operating leases 4.09%   4.09%
Weighted-average remaining lease term (in years) - finance leases 5 years 3 months 18 days   5 years 6 months
Weighted-average discount rate - finance leases (as a percent) 3.60%   3.60%
Operating Lease Liabilities, Payments Due [Abstract]      
Remainder of 2024 $ 2    
2025 2    
2026 1    
2027 1    
2028 0    
2029 0    
2030 and beyond 0    
Total lease payments 6    
Less: Interest 1    
Present value of lease liabilities 5   $ 6
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]      
Remainder of 2024 0    
2025 1    
2026 0    
2027 0    
2028 0    
2029 0    
2030 and beyond 0    
Total lease payments to be received 1    
Other Information Related to Leases [Abstract]      
Operating cash flows from operating leases included in the measurement of lease liabilities 0 0  
Financing cash flows from finance leases included in the measurement of lease liabilities 0 0  
CERC      
Lease, Cost [Abstract]      
Operating lease cost 0 0  
Short-term lease cost 0 0  
Total lease cost 0 0  
Operating Leases, Lease Income [Abstract]      
Operating lease income 1 1  
Total lease income 1 1  
Assets and Liabilities, Lessee [Abstract]      
Operating ROU assets 4   4
Finance ROU assets 0   0
Total leased assets 4   4
Current operating lease liability 1   1
Non-current operating lease liability 3   3
Total leased liabilities $ 4   $ 4
Weighted-average remaining lease term (in years) - operating leases 2 years 10 months 24 days   3 years 1 month 6 days
Weighted-average discount rate - operating leases 3.62%   3.60%
Weighted-average discount rate - finance leases (as a percent) 0.00%   0.00%
Operating Lease Liabilities, Payments Due [Abstract]      
Remainder of 2024 $ 2    
2025 1    
2026 1    
2027 0    
2028 0    
2029 0    
2030 and beyond 0    
Total lease payments 4    
Less: Interest 0    
Present value of lease liabilities 4   $ 4
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]      
Remainder of 2024 3    
2025 5    
2026 5    
2027 5    
2028 5    
2029 6    
2030 and beyond 164    
Total lease payments to be received 193    
Other Information Related to Leases [Abstract]      
Operating cash flows from operating leases included in the measurement of lease liabilities 0 0  
Financing cash flows from finance leases included in the measurement of lease liabilities $ 0 $ 0