Financial Instruments (Aggregate Fair Value and Carrying Value) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Carrying value	$ 27,680	$ 28,044
Fair value	23,956	30,459
Foreign currency denominated debt included in long-term debt above:
Carrying value	27,680	28,044
Foreign Currency Denominated Debt [Member]
Derivative [Line Items]
Carrying value	4,444	4,817
Foreign currency denominated debt included in long-term debt above:
Carrying value	4,444	4,817
Fair value	$ 4,150	$ 5,114