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Financial Instruments - Derivative Instruments Designated as Fair Value Hedges and Related Hedged Items (Details) - USD ($) $ in Millions | Mar. 30, 2024 | Sep. 30, 2023
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Carrying amount of hedged marketable securities | $ 15,045 | $ 14,433
Hedged asset, statement of financial position [Extensible Enumeration] | Marketable securities, Marketable securities | Marketable securities, Marketable securities
Carrying amount of hedged term debt | $ (16,817) | $ (18,247)
Hedged liability, statement of financial position [Extensible Enumeration] | Term debt, Term debt | Term debt, Term debt

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