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Leases Lease Obligations (Tables) | 12 Months Ended
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Dec. 31, 2023
Leases [Abstract] |
Lease, Cost [Table Text Block] | The components of lease cost were as follows (in millions):
| 2023 |  | 2022 |  |
Operating lease cost | $ | 4 |  |  | $ | 4 |  |  |
Finance lease cost: |  |  |  |  |
Amortization of right-of-use assets | $ | 14 |  |  | $ | 14 |  |  |
Interest on lease liabilities | 15 |  |  | 15 |  |  |
Total finance lease cost | $ | 29 |  |  | $ | 29 |  |  |
Variable lease cost | $ | 33 |  |  | $ | 31 |  |  |
Lessee, Operating Leases | Supplemental information related to amounts and presentation of leases in the consolidated balance sheets is presented below (in millions):
| Balance Sheet Classification |  | As of December 31,
|  | 2023 |  | 2022
Operating Leases: |  |  |  |  |
Operating lease right-of-use assets | Other noncurrent assets |  | $ | 18 |  |  | $ | 22 |
Current liabilities | Accrued expenses and other current liabilities |  | $ | 3 |  |  | $ | 4 |
Noncurrent liabilities | Other noncurrent liabilities |  | 16 |  |  | 18 |
Total operating lease liabilities * |  |  | $ | 19 |  |  | $ | 22 |
Finance Leases: |  |  |  |  |
Finance lease right-of-use assets | Electric utility plant, net |  | $ | 291 |  |  | $ | 305 |
Current liabilities | Current portion of finance lease obligations |  | $ | 20 |  |  | $ | 20 |
Noncurrent liabilities | Finance lease obligations, net of current portion |  | 289 |  |  | 294 |
Total finance lease liabilities * |  |  | $ | 309 |  |  | $ | 314 |
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block] | As of December 31, 2023, maturities of lease liabilities were as follows (in millions):
| Operating Leases |  | Finance Leases
2024 | $ | 3 |  |  | $ | 20 |
2025 | 1 |  |  | 27 |
2026 | 1 |  |  | 27 |
2027 | 1 |  |  | 27 |
2028 | 1 |  |  | 26 |
Thereafter | 40 |  |  | 356 |
Total lease payments | 47 |  |  | 483 |
Less imputed interest | (28) |  |  | (174) |
Total | $ | 19 |  |  | $ | 309 |
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] | Supplemental cash flow information related to leases for the years indicated was as follows (in millions):
| 2023 |  | 2022 |  | 2021
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |
Operating cash flows from operating leases | $ | 4 |  |  | $ | 4 |  |  | $ | 8 |
Operating cash flows from finance leases | 15 |  |  | 15 |  |  | 11 |
Financing cash flows from finance leases | 6 |  |  | 7 |  |  | 6 |
Right-of-use assets obtained in leasing arrangements: |  |  |  |  |
Operating leases | $ | — |  |  | $ | — |  |  | $ | (12) |
Finance leases | — |  |  | 29 |  |  | 153 |

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- Definition Tabular disclosure of undiscounted cash flows of finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to finance lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-6 + Details
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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//842-20/tableOfContent + Details
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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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