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Financial Instruments (Aggregate Notional Amounts, Aggregate Fair Values and Carrying Values) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Carrying value	$ 28,241	$ 29,471
Foreign Currency Denominated Debt [Member]
Derivative [Line Items]
Carrying value	5,021	5,171
Fair value	5,431	5,687
Foreign Currency Contract [Member] \| Net Investment Hedging [Member]
Derivative [Line Items]
Foreign currency contracts (notional amounts)	$ 0	$ 1,066

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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