Fair Value Measurements (Carrying Amounts and Fair Values of Other Financial Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and current portion of long-term debt	$ 1,695	$ 591
Long-term debt	16,707	19,086
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and current portion of long-term debt	1,672	584
Long-term debt	$ 14,415	$ 16,079