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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 | 9 Months Ended
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Jun. 26, 2021 | Jun. 27, 2020 | Jun. 26, 2021 | Jun. 27, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(Losses) recognized in OCI – included in effectiveness assessment, cash flow hedges | $ (87) | $ 360 | $ 153 | $ 103
Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment, cash flow hedges | 8 | 1,386 | (568) | 1,057
Foreign exchange contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(Losses) recognized in OCI – included in effectiveness assessment, cash flow hedges | (87) | 366 | 60 | 175
Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment, cash flow hedges | 9 | 1,389 | (562) | 1,063
Interest rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(Losses) recognized in OCI – included in effectiveness assessment, cash flow hedges | 0 | (6) | 93 | (72)
Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment, cash flow hedges | (1) | (3) | (6) | (6)
Foreign currency debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains/(Losses) recognized in OCI – included in effectiveness assessment, net investment hedges | $ 0 | $ (20) | $ 0 | $ 15

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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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