Financial Instruments (Aggregate Fair Value and Carrying Value) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Carrying value	$ 25,098	$ 26,680
Fair value	21,325	22,928
Foreign currency denominated debt included in long-term debt:
Carrying value	25,098	26,680
Foreign Currency Denominated Debt [Member]
Derivative [Line Items]
Carrying value	3,164	4,540
Foreign currency denominated debt included in long-term debt:
Carrying value	3,164	4,540
Fair value	$ 2,867	$ 4,165