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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 |

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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://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//1943274/2147480327/954-440-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not 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 -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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479016/842-30-45-3 + 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 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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