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Income Taxes - Aggregate Changes in Gross Unrecognized Tax Benefits, Excluding Interest and Penalties (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 29, 2018 | Sep. 30, 2017 | Sep. 24, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Beginning balances | $ 8,407 | $ 7,724 | $ 6,900
Increases related to tax positions taken during a prior year | 2,431 | 333 | 1,121
Decreases related to tax positions taken during a prior year | (2,212) | (952) | (257)
Increases related to tax positions taken during the current year | 1,824 | 1,880 | 1,578
Decreases related to settlements with taxing authorities | (756) | (539) | (1,618)
Decreases related to expiration of statute of limitations | 0 | (39) | 0
Ending balances | $ 9,694 | $ 8,407 | $ 7,724

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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