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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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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
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-Section 50
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as 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 220
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-Paragraph 15
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Amount, before tax and reclassification, of gain (loss) from derivative designated and qualifying as net investment hedge.

+ References

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