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Financial Instruments - Derivative Instruments Designated as Fair Value Hedges and Related Hedged Items (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 27, 2021 | Mar. 28, 2020 | Mar. 27, 2021 | Mar. 28, 2020 | 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 | $ 403 |  | $ 403 |  | $ 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 | (923) |  | (923) |  | (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 | 16,423 |  | 16,423 |  | 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 | (18,416) |  | (18,416) |  | $ (21,033)
OI&E |  |  |  |  |
Gains/(Losses) related to derivative instruments and hedged items: |  |  |  |  |
Gains/(Losses) on derivative instruments | 119 | $ 1,726 | (801) | $ 1,381 |
Gains/(Losses) related to hedged items | (118) | (1,726) | 801 | (1,381) |
OI&E | Foreign exchange contracts |  |  |  |  |
Gains/(Losses) related to derivative instruments and hedged items: |  |  |  |  |
Gains/(Losses) on derivative instruments | 570 | 436 | (183) | 253 |
Gains/(Losses) related to hedged items | (569) | (436) | 183 | (253) |
OI&E | Interest rate contracts |  |  |  |  |
Gains/(Losses) related to derivative instruments and hedged items: |  |  |  |  |
Gains/(Losses) on derivative instruments | (451) | 1,290 | (618) | 1,128 |
Gains/(Losses) related to hedged items | $ 451 | $ (1,290) | $ 618 | $ (1,128) |

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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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