Contractual interest rate for funds borrowed, under the debt agreement.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Debt And Lines Of Credit (Summary of Long-Term Debt Footnotes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt, fair value	$ 7,100	$ 10,500
Variable Rate Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	1.40%	1.30%
Environmental and industrial development bonds – due 2022 – 2035 (b)
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	3.20%	3.50%
Other (c)
Debt Instrument [Line Items]
Fair Value, Debt Instrument, Valuation Techniques, Change in Technique, Quantification of Effect	$ 1	$ 4
Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.00%	3.00%	3.00%
Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	9.50%	9.50%	9.50%