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Leases (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
MW
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
MW
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Lease, Cost [Abstract]          
Operating lease cost $ 2 $ 1 $ 4 $ 4  
Short-term lease cost 0 15 8 28  
Total lease cost 2 16 12 32  
Operating Leases, Lease Income [Abstract]          
Operating lease income 1 2 4 5  
Variable lease income 0 0 1 1  
Total lease income 1 2 5 6  
Assets and Liabilities, Lessee [Abstract]          
Operating ROU assets 16   16   $ 13
Finance ROU assets 454   454   526
Total leased assets 470   470   539
Current operating lease liability 3   3   3
Non-current operating lease liability 13   13   10
Total leased liabilities $ 16   $ 16   $ 13
Weighted-average remaining lease term (in years) - operating leases 11 years 10 months 24 days   11 years 10 months 24 days   4 years 8 months 12 days
Weighted-average discount rate - operating leases 4.53%   4.53%   4.13%
Weighted-average remaining lease term (in years) - finance leases 4 years 9 months 18 days   4 years 9 months 18 days   5 years 6 months
Weighted-average discount rate - finance leases (as a percent) 3.60%   3.60%   3.60%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other non-current assets   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   Property, Plant and Equipment, Net
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other current liabilities   Other current liabilities   Other current liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other non-current liabilities   Other non-current liabilities   Other non-current liabilities
Operating Lease Liabilities, Payments Due [Abstract]          
Remainder of 2024 $ 1   $ 1    
2025 4   4    
2026 4   4    
2027 2   2    
2028 1   1    
Thereafter 11   11    
Total lease payments 23   23    
Less: Interest 7   7    
Present value of lease liabilities 16   16   $ 13
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]          
Remainder of 2024 0   0    
2025 3   3    
2026 3   3    
2027 2   2    
2028 2   2    
Thereafter 2   2    
Total lease payments to be received 12   12    
Other Information Related to Leases [Abstract]          
Operating cash flows from operating leases included in the measurement of lease liabilities     4 4  
Houston Electric          
Lease Disclosure [Line Items]          
Expenses associated with short-term lease $ 92   $ 92   100
Number of megawatts of mobile generation | MW 505   505    
Escrow deposit $ 84   $ 84    
Expenses associated with long term lease 147   147   124
Lease, Cost [Abstract]          
Operating lease cost 0 1 2 2  
Short-term lease cost 0 14 7 27  
Total lease cost 0 15 9 29  
Operating Leases, Lease Income [Abstract]          
Operating lease income 0 1 0 1  
Variable lease income 0 0 0 0  
Total lease income 0 1 0 1  
Assets and Liabilities, Lessee [Abstract]          
Operating ROU assets 5   5   6
Finance ROU assets 454   454   526
Total leased assets 459   459   532
Current operating lease liability 2   2   1
Non-current operating lease liability 3   3   5
Total leased liabilities $ 5   $ 5   $ 6
Weighted-average remaining lease term (in years) - operating leases 3 years 2 months 12 days   3 years 2 months 12 days   3 years 10 months 24 days
Weighted-average discount rate - operating leases 4.11%   4.11%   4.09%
Weighted-average remaining lease term (in years) - finance leases 4 years 9 months 18 days   4 years 9 months 18 days   5 years 6 months
Weighted-average discount rate - finance leases (as a percent) 3.60%   3.60%   3.60%
Operating Lease Liabilities, Payments Due [Abstract]          
Remainder of 2024 $ 1   $ 1    
2025 2   2    
2026 1   1    
2027 1   1    
2028 0   0    
Thereafter 0   0    
Total lease payments 5   5    
Less: Interest 0   0    
Present value of lease liabilities 5   5   $ 6
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]          
Remainder of 2024 0   0    
2025 1   1    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 0   0    
Total lease payments to be received 1   1    
Other Information Related to Leases [Abstract]          
Operating cash flows from operating leases included in the measurement of lease liabilities     2 1  
CERC          
Lease, Cost [Abstract]          
Operating lease cost 0 0 1 1  
Short-term lease cost 0 0 0 0  
Total lease cost 0 0 1 1  
Operating Leases, Lease Income [Abstract]          
Operating lease income 1 1 3 3  
Variable lease income 0 0 0 0  
Total lease income 1 $ 1 3 3  
Assets and Liabilities, Lessee [Abstract]          
Operating ROU assets 4   4   4
Finance ROU assets 0   0   0
Total leased assets 4   4   4
Current operating lease liability 1   1   1
Non-current operating lease liability 3   3   3
Total leased liabilities $ 4   $ 4   $ 4
Weighted-average remaining lease term (in years) - operating leases 3 years 4 months 24 days   3 years 4 months 24 days   3 years 1 month 6 days
Weighted-average discount rate - operating leases 4.04%   4.04%   3.60%
Weighted-average discount rate - finance leases (as a percent) 0.00%   0.00%   0.00%
Operating Lease Liabilities, Payments Due [Abstract]          
Remainder of 2024 $ 1   $ 1    
2025 2   2    
2026 1   1    
2027 0   0    
2028 0   0    
Thereafter 0   0    
Total lease payments 4   4    
Less: Interest 0   0    
Present value of lease liabilities 4   4   $ 4
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]          
Remainder of 2024 0   0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 0   0    
Total lease payments to be received $ 0   0    
Other Information Related to Leases [Abstract]          
Operating cash flows from operating leases included in the measurement of lease liabilities     $ 1 $ 1