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Leases (Details)
$ in Millions
 12 Months Ended 24 Months Ended
Dec. 31, 2023
USD ($)
MW
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
Lease, Cost [Abstract]        
Operating lease cost $ 6 $ 6 $ 8  
Short-term lease cost 31 167 119  
Total lease cost 37 173 127  
Operating Leases, Lease Income [Abstract]        
Operating lease income 6 5 6  
Variable lease income 2 2 1  
Total lease income 8 7 7  
Assets and Liabilities, Lessee [Abstract]        
Operating ROU assets 13 19   $ 19
Finance ROU assets 526 621   621
Total leased assets 539 640   640
Current operating lease liability 3 5   5
Non-current operating lease liability 10 14   14
Total leased liabilities $ 13 $ 19   $ 19
Weighted-average remaining lease term (in years) - operating leases 4 years 8 months 12 days 4 years 3 months 18 days   4 years 3 months 18 days
Weighted-average discount rate - operating leases (as a percent) 4.13% 3.80%   3.80%
Weighted-average remaining lease term (in years) - finance leases 5 years 6 months 6 years 6 months   6 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 Property, plant and equipment   Property, plant and equipment
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Other   Other
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Other   Other
Operating Lease Liabilities, Payments Due [Abstract]        
2024 $ 4      
2025 3      
2026 3      
2027 2      
2028 1      
2029 and beyond 2      
Total lease payments 15      
Less: Interest 2      
Present value of lease liabilities 13 $ 19   $ 19
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]        
2024 6      
2025 8      
2026 8      
2027 7      
2028 7      
2029 and beyond 173      
Total lease payments to be received 209      
Other Information Related to Leases [Abstract]        
Operating cash flows from operating leases included in the measurement of lease liabilities 5 6 6  
Financing cash flows from finance leases included in the measurement of lease liabilities 0 485 179  
Houston Electric        
Lease Disclosure [Line Items]        
Expenses associated with short-term lease $ 100 103   103
Number of megawatts of mobile generation | MW 505      
Cash payment   485   664
Escrow deposit $ 97      
Expenses associated with long term lease $ 124 60   60
Right to terminate, lease costs refunded (as a percent) 75.00%      
Lease, Cost [Abstract]        
Operating lease cost $ 3 1 1  
Short-term lease cost 30 166 118  
Total lease cost 33 167 119  
Operating Leases, Lease Income [Abstract]        
Operating lease income 1 1 1  
Variable lease income 0 0 0  
Total lease income 1 1 1  
Assets and Liabilities, Lessee [Abstract]        
Operating ROU assets 6 6   6
Finance ROU assets 526 621   621
Total leased assets 532 627   627
Current operating lease liability 1 1   1
Non-current operating lease liability 5 5   5
Total leased liabilities $ 6 $ 6   $ 6
Weighted-average remaining lease term (in years) - operating leases 3 years 10 months 24 days 4 years 9 months 18 days   4 years 9 months 18 days
Weighted-average discount rate - operating leases (as a percent) 4.09% 4.01%   4.01%
Weighted-average remaining lease term (in years) - finance leases 5 years 6 months 6 years 6 months   6 years 6 months
Weighted-average discount rate - finance leases (as a percent) 3.60% 3.60%   3.60%
Operating Lease Liabilities, Payments Due [Abstract]        
2024 $ 2      
2025 2      
2026 1      
2027 1      
2028 0      
2029 and beyond 0      
Total lease payments 6      
Less: Interest 0      
Present value of lease liabilities 6 $ 6   $ 6
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]        
2024 1      
2025 1      
2026 0      
2027 0      
2028 0      
2029 and beyond 0      
Total lease payments to be received 2      
Other Information Related to Leases [Abstract]        
Operating cash flows from operating leases included in the measurement of lease liabilities 2 1 1  
Financing cash flows from finance leases included in the measurement of lease liabilities 0 485 179  
CERC Corp        
Lease, Cost [Abstract]        
Operating lease cost 2 2 4  
Short-term lease cost 0 1 0  
Total lease cost 2 3 4  
Operating Leases, Lease Income [Abstract]        
Operating lease income 4 3 3  
Variable lease income 0 0 0  
Total lease income 4 3 3  
Assets and Liabilities, Lessee [Abstract]        
Operating ROU assets 4 5   5
Finance ROU assets 0 0   0
Total leased assets 4 5   5
Current operating lease liability 1 2   2
Non-current operating lease liability 3 4   4
Total leased liabilities $ 4 $ 6   $ 6
Weighted-average remaining lease term (in years) - operating leases 3 years 1 month 6 days 3 years 10 months 24 days   3 years 10 months 24 days
Weighted-average discount rate - operating leases (as a percent) 3.60% 3.58%   3.58%
Weighted-average discount rate - finance leases (as a percent) 0.00% 0.00%   0.00%
Operating Lease Liabilities, Payments Due [Abstract]        
2024 $ 2      
2025 1      
2026 1      
2027 0      
2028 0      
2029 and beyond 0      
Total lease payments 4      
Less: Interest 0      
Present value of lease liabilities 4 $ 6   $ 6
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]        
2024 4      
2025 5      
2026 5      
2027 5      
2028 5      
2029 and beyond 170      
Total lease payments to be received 194      
Other Information Related to Leases [Abstract]        
Operating cash flows from operating leases included in the measurement of lease liabilities 2 2 3  
Financing cash flows from finance leases included in the measurement of lease liabilities $ 0 $ 0 $ 0