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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. 28, 2020 | Mar. 30, 2019 | Mar. 28, 2020 | Mar. 30, 2019
OI&E |  |  |  |
Gains/(Losses) related to derivative instruments and hedged items: |  |  |  |
Gains/(Losses) on derivative instruments | $ 1,726 | $ 708 | $ 1,381 | $ 1,767
Gains/(Losses) related to hedged items | (1,726) | (707) | (1,381) | (1,766)
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 | (877) |  | (877) |
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 | 15,080 |  | 15,080 |
Foreign exchange contracts | OI&E |  |  |  |
Gains/(Losses) related to derivative instruments and hedged items: |  |  |  |
Gains/(Losses) on derivative instruments | 436 | 243 | 253 | 645
Gains/(Losses) related to hedged items | (436) | (242) | (253) | (644)
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 | (1,708) |  | (1,708) |
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 | (27,439) |  | (27,439) |
Interest rate contracts | OI&E |  |  |  |
Gains/(Losses) related to derivative instruments and hedged items: |  |  |  |
Gains/(Losses) on derivative instruments | 1,290 | 465 | 1,128 | 1,122
Gains/(Losses) related to hedged items | $ (1,290) | $ (465) | $ (1,128) | $ (1,122)

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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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- 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=109980867&loc=SL109999712-113959 + Details
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