Debt And Lines Of Credit (Summary of Long-Term Debt Footnotes) (Details) - USD ($) $ in Billions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term debt, fair value	$ 5.5	$ 5.2
Variable Rate Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	5.40%	4.60%
Environmental and industrial development bonds – due 2023 – 2028 (b)
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	2.40%	2.40%