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Financial Instruments (Aggregate Notional Amounts, Aggregate Fair Values and Carrying Values) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Carrying value | $ 28,127 | $ 29,471
Foreign Currency Denominated Debt [Member] |  |
Derivative [Line Items] |  |
Carrying value | 4,905 | 5,171
Fair value | 5,288 | 5,687
Foreign Currency Contract [Member] | Net Investment Hedging [Member] |  |
Derivative [Line Items] |  |
Foreign currency contracts (notional amounts) | $ 0 | $ 1,066

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