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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

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