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Financial Instruments - Pre-Tax Gains and Losses of Derivative and Non-Derivative Instruments Designated as Cash Flow and Net Investment Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 27, 2021 | Mar. 28, 2020 | Mar. 27, 2021 | Mar. 28, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(Losses) recognized in OCI – included in effectiveness assessment, cash flow hedges | $ 377 | $ (528) | $ 240 | $ (257)
Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment, cash flow hedges | (887) | (818) | (576) | (329)
Foreign exchange contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(Losses) recognized in OCI – included in effectiveness assessment, cash flow hedges | 338 | (462) | 147 | (191)
Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment, cash flow hedges | (885) | (817) | (571) | (326)
Interest rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(Losses) recognized in OCI – included in effectiveness assessment, cash flow hedges | 39 | (66) | 93 | (66)
Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment, cash flow hedges | (2) | (1) | (5) | (3)
Foreign currency debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(Losses) recognized in OCI – included in effectiveness assessment, net investment hedges | $ 0 | $ 11 | $ 0 | $ 35

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- Definition Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121577181&loc=SL110061190-113977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 + Details
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