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Financial Instruments - Derivative Instruments Designated as Fair Value Hedges and Related Hedged Items (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 26, 2020 | Dec. 28, 2019 | Sep. 26, 2020
Foreign exchange contracts |  |  |
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments: |  |  |
Cumulative hedging adjustment increases/(decreases) included in the carrying amount of hedged marketable securities | $ 956 |  | $ 493
Interest rate contracts |  |  |
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments: |  |  |
Cumulative hedging adjustment (increases)/decreases included in the carrying amount of hedged fixed-rate debt | (1,374) |  | (1,541)
Current marketable securities and non-current marketable securities | Foreign exchange contracts |  |  |
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments: |  |  |
Carrying amount of hedged marketable securities | 17,009 |  | 16,270
Current term debt and non-current term debt | Interest rate contracts |  |  |
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments: |  |  |
Carrying amount of hedged fixed-rate debt | (20,866) |  | $ (21,033)
OI&E |  |  |
Gains/(Losses) related to derivative instruments and hedged items: |  |  |
Gains/(Losses) on derivative instruments | (920) | $ (345) |
Gains/(Losses) related to hedged items | 919 | 345 |
OI&E | Foreign exchange contracts |  |  |
Gains/(Losses) related to derivative instruments and hedged items: |  |  |
Gains/(Losses) on derivative instruments | (753) | (183) |
Gains/(Losses) related to hedged items | 752 | 183 |
OI&E | Interest rate contracts |  |  |
Gains/(Losses) related to derivative instruments and hedged items: |  |  |
Gains/(Losses) on derivative instruments | (167) | (162) |
Gains/(Losses) related to hedged items | $ 167 | $ 162 |

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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=121577467&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=121577467&loc=d3e76258-113986 + Details
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- Definition Amount of asset hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109999712-113959 + Details
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