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Financial Instruments (Aggregate Fair Value and Carrying Value) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Derivative [Line Items]    
Carrying value $ 25,042 $ 26,233
Fair value 23,130 24,373
Foreign Currency Denominated Debt [Member]    
Derivative [Line Items]    
Carrying value 3,229 3,303
Fair value $ 3,081 $ 3,125