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Long term debt (Tables) | 12 Months Ended
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Dec. 31, 2024
Long-Term Debt, Unclassified [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] | Long-term debt consists of the following (dollars in millions):
| As of December 31,
| 2024 |  | 2023
First Mortgage Bonds, rates range from 1.82% to 6.88%, with a weighted average rate of 4.52% in 2024 and 4.32% in 2023, due at various dates through 2059. | $ | 4,250 |  |  | $ | 3,880 |
Unsecured term bank loan, variable rate of 5.30% at December 31, 2024 | 170 |  |  | — |
Pollution Control Revenue Bonds, rates at 2.13% and 2.38%, due 2033 | 119 |  |  | 119 |
Total long-term debt | 4,539 |  |  | 3,999 |
Less: Unamortized debt expense | (15) |  |  | (14) |
Less: Current portion of long-term debt | (170) |  |  | (80) |
Long-term debt, net of current portion | $ | 4,354 |  |  | $ | 3,905 |
Schedule of Maturities of Long-term Debt [Table Text Block] | As of December 31, 2024, the future minimum principal payments on long-term debt are as follows (in millions):
Years ending December 31: |  |
2025 |  | $ | 170 |
2026 |  | — |
2027 |  | 160 |
2028 |  | 100 |
2029 |  | 200 |
Thereafter |  | 3,909 |
|  | $ | 4,539 |
Lessee, Operating Lease, Liability, Maturity | As of December 31, 2024, the future minimum payments on the financing arrangement are as follows (in millions):
Years ending December 31: |  |
2025 |  | $ | 5 |
2026 |  | 5 |
2027 |  | 5 |
2028 |  | 5 |
2029 |  | 5 |
Thereafter |  | 59 |
Total Payments |  | 84 |
Less: Imputed Interest |  | (52) |
Present value of minimum payments |  | $ | 32 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69E -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69E Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-8 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-6 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-7 + Details
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