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Financial Instruments (Aggregate Notional Amounts, Aggregate Fair Values and Carrying Values) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Carrying value	$ 27,922	$ 28,044
Foreign Currency Denominated Debt [Member]
Derivative [Line Items]
Carrying value	4,690	4,817
Fair value	$ 4,713	$ 5,114

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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