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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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