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Leases (Details) $ in Millions | 12 Months Ended | 24 Months Ended
--- | --- | ---
Dec. 31, 2024 USD ($) MW | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 USD ($)
Lease, Cost [Abstract] |  |  |  |
Operating lease cost | $ 6 | $ 6 | $ 6 |
Short-term lease cost | 12 | 31 | 167 |
Total lease cost | 18 | 37 | 173 |
Operating Leases, Lease Income [Abstract] |  |  |  |
Operating lease income | 7 | 6 | 5 |
Variable lease income | 1 | 2 | 2 |
Total lease income | 8 | 8 | 7 |
Assets and Liabilities, Lessee [Abstract] |  |  |  |
Operating ROU assets | 27 | 13 |  |
Finance ROU assets | 430 | 526 |  |
Total leased assets | 457 | 539 |  |
Current operating lease liability | 3 | 3 |  |
Non-current operating lease liability | 25 | 10 |  |
Total leased liabilities | $ 28 | $ 13 |  |
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 |  |
Weighted-Average Remaining Lease Term and Weighted-Average Discount Rate [Abstract] |  |  |  |
Weighted-average remaining lease term (in years) - operating leases | 17 years 8 months 12 days | 4 years 8 months 12 days |  |
Weighted-average discount rate - operating leases | 4.92% | 4.13% |  |
Weighted-average remaining lease term (in years) - finance leases | 4 years 6 months | 5 years 6 months |  |
Weighted-average discount rate - finance leases | 3.60% | 3.60% |  |
Operating Lease Liabilities, Payments Due [Abstract] |  |  |  |
2025 | $ 4 |  |  |
2026 | 4 |  |  |
2027 | 3 |  |  |
2028 | 2 |  |  |
2029 | 2 |  |  |
Thereafter | 30 |  |  |
Total lease payments | 45 |  |  |
Less: Interest | 17 |  |  |
Present value of lease liabilities | 28 | $ 13 |  |
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract] |  |  |  |
2025 | 9 |  |  |
2026 | 9 |  |  |
2027 | 8 |  |  |
2028 | 4 |  |  |
2029 | 1 |  |  |
Thereafter | 1 |  |  |
Total lease payments to be received | 32 |  |  |
Other Information Related to Leases [Abstract] |  |  |  |
Operating cash flows from operating leases included in the measurement of lease liabilities | 5 | 5 | 6 |
Financing cash flows from finance leases included in the measurement of lease liabilities | 0 | 0 | 485 |
Houston Electric |  |  |  |
Lease Disclosure [Line Items] |  |  |  |
Expenses associated with short-term lease | $ 89 | 100 |  |
Number of megawatts of mobile generation | MW | 505 |  |  |
Cash payment |  |  | 485 | $ 664
Escrow deposit | $ 79 |  |  |
Expenses associated with long term lease | 158 | 124 |  |
Lease, Cost [Abstract] |  |  |  |
Operating lease cost | 3 | 3 | 1 |
Short-term lease cost | 11 | 30 | 166 |
Total lease cost | 14 | 33 | 167 |
Operating Leases, Lease Income [Abstract] |  |  |  |
Operating lease income | 0 | 1 | 1 |
Variable lease income | 0 | 0 | 0 |
Total lease income | 0 | 1 | 1 |
Assets and Liabilities, Lessee [Abstract] |  |  |  |
Operating ROU assets | 5 | 6 |  |
Finance ROU assets | 430 | 526 |  |
Total leased assets | 435 | 532 |  |
Current operating lease liability | 1 | 1 |  |
Non-current operating lease liability | 3 | 5 |  |
Total leased liabilities | $ 4 | $ 6 |  |
Weighted-Average Remaining Lease Term and Weighted-Average Discount Rate [Abstract] |  |  |  |
Weighted-average remaining lease term (in years) - operating leases | 2 years 10 months 24 days | 3 years 10 months 24 days |  |
Weighted-average discount rate - operating leases | 4.11% | 4.09% |  |
Weighted-average remaining lease term (in years) - finance leases | 4 years 6 months | 5 years 6 months |  |
Weighted-average discount rate - finance leases | 3.60% | 3.60% |  |
Operating Lease Liabilities, Payments Due [Abstract] |  |  |  |
2025 | $ 2 |  |  |
2026 | 1 |  |  |
2027 | 1 |  |  |
2028 | 0 |  |  |
2029 | 0 |  |  |
Thereafter | 0 |  |  |
Total lease payments | 4 |  |  |
Less: Interest | 0 |  |  |
Present value of lease liabilities | 4 | $ 6 |  |
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract] |  |  |  |
2025 | 1 |  |  |
2026 | 0 |  |  |
2027 | 0 |  |  |
2028 | 0 |  |  |
2029 | 0 |  |  |
Thereafter | 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 | 2 | 2 | 1 |
Financing cash flows from finance leases included in the measurement of lease liabilities | 0 | 0 | 485 |
CERC |  |  |  |
Lease, Cost [Abstract] |  |  |  |
Operating lease cost | 2 | 2 | 2 |
Short-term lease cost | 0 | 0 | 1 |
Total lease cost | 2 | 2 | 3 |
Operating Leases, Lease Income [Abstract] |  |  |  |
Operating lease income | 5 | 4 | 3 |
Variable lease income | 0 | 0 | 0 |
Total lease income | 5 | 4 | 3 |
Assets and Liabilities, Lessee [Abstract] |  |  |  |
Operating ROU assets | 15 | 4 |  |
Finance ROU assets | 0 | 0 |  |
Total leased assets | 15 | 4 |  |
Current operating lease liability | 1 | 1 |  |
Non-current operating lease liability | 14 | 3 |  |
Total leased liabilities | $ 15 | $ 4 |  |
Weighted-Average Remaining Lease Term and Weighted-Average Discount Rate [Abstract] |  |  |  |
Weighted-average remaining lease term (in years) - operating leases | 20 years 7 months 6 days | 3 years 1 month 6 days |  |
Weighted-average discount rate - operating leases | 5.03% | 3.60% |  |
Weighted-average discount rate - finance leases | 0.00% | 0.00% |  |
Operating Lease Liabilities, Payments Due [Abstract] |  |  |  |
2025 | $ 2 |  |  |
2026 | 2 |  |  |
2027 | 1 |  |  |
2028 | 1 |  |  |
2029 | 1 |  |  |
Thereafter | 19 |  |  |
Total lease payments | 26 |  |  |
Less: Interest | 11 |  |  |
Present value of lease liabilities | 15 | $ 4 |  |
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract] |  |  |  |
2025 | 6 |  |  |
2026 | 6 |  |  |
2027 | 7 |  |  |
2028 | 2 |  |  |
2029 | 0 |  |  |
Thereafter | 0 |  |  |
Total lease payments to be received | 21 |  |  |
Other Information Related to Leases [Abstract] |  |  |  |
Operating cash flows from operating leases included in the measurement of lease liabilities | 2 | 2 | 2 |
Financing cash flows from finance leases included in the measurement of lease liabilities | $ 0 | $ 0 | $ 0 |

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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 440 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478522/954-440-50-1 + Details
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- Definition Amount of lease income from operating, direct financing, and sales-type leases. Includes, but is not limited to, variable lease payments, interest income, profit (loss) recognized at commencement, and lease payments paid and payable to lessor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479773/842-30-50-5 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of operating lease income from lease payments paid and payable to lessor. Excludes variable lease payments not included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-6A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479773/842-30-50-5 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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- Definition Indicates line item in statement of financial position that includes current operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-2 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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- Definition Indicates line item in statement of financial position that includes noncurrent operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-2 + Details
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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- Definition Indicates line item in statement of financial position that includes operating lease right-of-use asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-2 + Details
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- Definition Amount of operating lease income from variable lease payments paid and payable to lessor, excluding amount included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479773/842-30-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-6A + Details
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- Definition Weighted average discount rate for operating lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of short-term lease cost, excluding expense for lease with term of one month or less. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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