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Long term debt (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of Long-term Debt | $ 670 | $ 600 | $ 360
Long-term Debt, Current Maturities | 170 | 80 |
Repayments of Long-term Debt | 130 | 260 | $ 0
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 |

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