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Long term debt (Details) - USD ($) $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2023 | Aug. 29, 2023 | Jan. 13, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt | $ 200 | $ 500 | $ 100 | $ 600 | $ 360 | $ 400
Long-term Debt, Current Maturities |  |  |  | 80 | 260 |
Repayments of Long-term Debt |  |  |  | 260 | 0 | $ 160
Pollution Control Revenue Bonds at 2,125% |  |  |  | 98 |  |
Pollution Control Revenue Bonds at 2.375% |  |  |  | 21 |  |
Pollution Control Revenue Bonds, rates at 2.13% and 2.38%, due 2033 |  |  |  | $ 119 | $ 119 |
2030 Member [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  | 50 |  |  |  |
2033 Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  | 150 |  |  |  |
2038 Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  | 100 |  |  |  |
2059 Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  | 100 |  |  |  |
2053 Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  | $ 100 |  |  |  |

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- Definition Represents the current and noncurrent portions of a debt security issued by a state, certain agencies or authorities, a local government, or development corporation to finance the construction of air- or water-pollution control facilities or sewage or solid waste disposal facilities pursuant to federal law. The bonds are backed by the credit of the beneficiary of the financing rather than the credit of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20,22) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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