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Financial Instruments - Derivative Instruments Designated as Fair Value Hedges and Related Hedged Items (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 28, 2019 | Dec. 29, 2018
OI&E |  |
Gains/(Losses) related to derivative instruments and hedged items: |  |
Gains/(Losses) on derivative instruments | $ (345) | $ 1,059
Gains/(Losses) related to hedged items | 345 | (1,059)
Foreign exchange contracts |  |
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments: |  |
Cumulative hedging adjustment increases/(decreases) included in the carrying amount hedged marketable securities | (594) |
Foreign exchange contracts | Current marketable securities and non-current marketable securities |  |
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments: |  |
Carrying amount of hedged marketable securities | 15,544 |
Foreign exchange contracts | OI&E |  |
Gains/(Losses) related to derivative instruments and hedged items: |  |
Gains/(Losses) on derivative instruments | (183) | 402
Gains/(Losses) related to hedged items | 183 | (402)
Interest rate contracts |  |
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments: |  |
Cumulative hedging adjustment (increases)/decreases included in the carrying amount hedged fixed-rate debt | (418) |
Interest rate contracts | Current term debt and non-current term debt |  |
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments: |  |
Carrying amount of hedged fixed-rate debt | (28,631) |
Interest rate contracts | OI&E |  |
Gains/(Losses) related to derivative instruments and hedged items: |  |
Gains/(Losses) on derivative instruments | (162) | 657
Gains/(Losses) related to hedged items | $ 162 | $ (657)

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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + Details
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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + Details
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