Financial Instruments (Aggregate Fair Value and Carrying Value) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Carrying value	$ 26,233	$ 26,680
Fair value	24,373	22,928
Foreign Currency Denominated Debt [Member]
Derivative [Line Items]
Carrying value	3,303	4,540
Fair value	$ 3,125	$ 4,165

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant