Fair Value Measurements (Schedule of Carrying Values and Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	$ 170	$ 170
Equity Securities, FV-NI and without Readily Determinable Fair Value	0	0
Insurance contracts in nonqualified pension trusts, carrying amount	21	22
Insurance contracts in nonqualified pension trusts, fair value	21	23
Long-term debt, including current installments of long-term debt, carrying amount	13,400	13,953
Long-term debt, including current installments of long-term debt, fair value	13,662	13,419
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Securities, FV-NI and without Readily Determinable Fair Value	0	0
Insurance contracts in nonqualified pension trusts, fair value	21	23
Long-term debt, including current installments of long-term debt, fair value	13,514	13,247
Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Securities, FV-NI and without Readily Determinable Fair Value	0	0
Insurance contracts in nonqualified pension trusts, fair value	0	0
Long-term debt, including current installments of long-term debt, fair value	$ 148	$ 172