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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Jul. 01, 2017 | Sep. 24, 2016 | Jun. 25, 2016 | Sep. 26, 2015
--- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | $ 261,259 | $ 235,810 |  |
Unrealized Gains | 1,155 | 2,186 |  |
Unrealized Losses | (898) | (411) |  |
Fair Value | 261,516 | 237,585 |  |
Cash and Cash Equivalents | 18,571 | 20,484 | $ 18,237 | $ 21,120
Short-Term Marketable Securities | 58,188 | 46,671 |  |
Long-Term Marketable Securities | 184,757 | 170,430 |  |
Cash |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 8,529 | 8,601 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 8,529 | 8,601 |  |
Cash and Cash Equivalents | 8,529 | 8,601 |  |
Short-Term Marketable Securities | 0 | 0 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 4,092 | 5,073 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | (118) | (146) |  |
Fair Value | 3,974 | 4,927 |  |
Cash and Cash Equivalents | 3,088 | 3,666 |  |
Short-Term Marketable Securities | 886 | 1,261 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Level 1 | Money market funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 3,088 | 3,666 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 3,088 | 3,666 |  |
Cash and Cash Equivalents | 3,088 | 3,666 |  |
Short-Term Marketable Securities | 0 | 0 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Level 1 | Mutual funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 1,004 | 1,407 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | (118) | (146) |  |
Fair Value | 886 | 1,261 |  |
Cash and Cash Equivalents | 0 | 0 |  |
Short-Term Marketable Securities | 886 | 1,261 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Level 2 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 248,638 | 222,136 |  |
Unrealized Gains | 1,155 | 2,186 |  |
Unrealized Losses | (780) | (265) |  |
Fair Value | 249,013 | 224,057 |  |
Cash and Cash Equivalents | 6,954 | 8,217 |  |
Short-Term Marketable Securities | 57,302 | 45,410 |  |
Long-Term Marketable Securities | 184,757 | 170,430 |  |
Level 2 | U.S. Treasury securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 52,616 | 41,697 |  |
Unrealized Gains | 77 | 319 |  |
Unrealized Losses | (230) | (4) |  |
Fair Value | 52,463 | 42,012 |  |
Cash and Cash Equivalents | 1,013 | 1,527 |  |
Short-Term Marketable Securities | 20,104 | 13,492 |  |
Long-Term Marketable Securities | 31,346 | 26,993 |  |
Level 2 | U.S. agency securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 5,328 | 7,543 |  |
Unrealized Gains | 3 | 16 |  |
Unrealized Losses | (9) | 0 |  |
Fair Value | 5,322 | 7,559 |  |
Cash and Cash Equivalents | 2,255 | 2,762 |  |
Short-Term Marketable Securities | 1,774 | 2,441 |  |
Long-Term Marketable Securities | 1,293 | 2,356 |  |
Level 2 | Non-U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 6,987 | 7,609 |  |
Unrealized Gains | 156 | 259 |  |
Unrealized Losses | (50) | (27) |  |
Fair Value | 7,093 | 7,841 |  |
Cash and Cash Equivalents | 0 | 110 |  |
Short-Term Marketable Securities | 64 | 818 |  |
Long-Term Marketable Securities | 7,029 | 6,913 |  |
Level 2 | Certificates of deposit and time deposits |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 6,731 | 6,598 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 6,731 | 6,598 |  |
Cash and Cash Equivalents | 894 | 1,108 |  |
Short-Term Marketable Securities | 5,191 | 3,897 |  |
Long-Term Marketable Securities | 646 | 1,593 |  |
Level 2 | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 5,187 | 7,433 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 5,187 | 7,433 |  |
Cash and Cash Equivalents | 2,683 | 2,468 |  |
Short-Term Marketable Securities | 2,504 | 4,965 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Level 2 | Corporate securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 150,089 | 131,166 |  |
Unrealized Gains | 882 | 1,409 |  |
Unrealized Losses | (312) | (206) |  |
Fair Value | 150,659 | 132,369 |  |
Cash and Cash Equivalents | 109 | 242 |  |
Short-Term Marketable Securities | 27,522 | 19,599 |  |
Long-Term Marketable Securities | 123,028 | 112,528 |  |
Level 2 | Municipal securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 938 | 956 |  |
Unrealized Gains | 3 | 5 |  |
Unrealized Losses | (2) | 0 |  |
Fair Value | 939 | 961 |  |
Cash and Cash Equivalents | 0 | 0 |  |
Short-Term Marketable Securities | 127 | 167 |  |
Long-Term Marketable Securities | 812 | 794 |  |
Level 2 | Mortgage- and asset-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 20,762 | 19,134 |  |
Unrealized Gains | 34 | 178 |  |
Unrealized Losses | (177) | (28) |  |
Fair Value | 20,619 | 19,284 |  |
Cash and Cash Equivalents | 0 | 0 |  |
Short-Term Marketable Securities | 16 | 31 |  |
Long-Term Marketable Securities | $ 20,603 | $ 19,253 |  |

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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 + Details
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