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Cash and Available-for-Sale Securities' Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value Recorded as Cash and Cash Equivalents or Short-Term or Long-Term Marketable Securities (Detail) - USD ($) $ in Millions | Mar. 26, 2016 | Sep. 26, 2015 | Mar. 28, 2015 | Sep. 27, 2014
--- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Adjusted Cost |  | $ 233,449 | $ 206,420 |  |
Unrealized Gains |  | 945 | 574 |  |
Unrealized Losses |  | (1,466) | (1,328) |  |
Fair Value |  | 232,928 | 205,666 |  |
Cash and cash equivalents |  | 21,514 | 21,120 | $ 14,489 | $ 13,844
Short-term marketable securities |  | 33,769 | 20,481 |  |
Long-term marketable securities |  | 177,645 | 164,065 |  |
Cash |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Adjusted Cost |  | 10,199 | 11,389 |  |
Unrealized Gains |  | 0 | 0 |  |
Unrealized Losses |  | 0 | 0 |  |
Fair Value |  | 10,199 | 11,389 |  |
Cash and cash equivalents |  | 10,199 | 11,389 |  |
Short-term marketable securities |  | 0 | 0 |  |
Long-term marketable securities |  | 0 | 0 |  |
Level 1 |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Adjusted Cost | [1] | 4,570 | 3,570 |  |
Unrealized Gains | [1] | 0 | 0 |  |
Unrealized Losses | [1] | (203) | (144) |  |
Fair Value | [1] | 4,367 | 3,426 |  |
Cash and cash equivalents | [1] | 2,798 | 1,798 |  |
Short-term marketable securities | [1] | 1,569 | 1,628 |  |
Long-term marketable securities | [1] | 0 | 0 |  |
Level 1 | Money market funds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Adjusted Cost | [1] | 2,798 | 1,798 |  |
Unrealized Gains | [1] | 0 | 0 |  |
Unrealized Losses | [1] | 0 | 0 |  |
Fair Value | [1] | 2,798 | 1,798 |  |
Cash and cash equivalents | [1] | 2,798 | 1,798 |  |
Short-term marketable securities | [1] | 0 | 0 |  |
Long-term marketable securities | [1] | 0 | 0 |  |
Level 1 | Mutual funds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Adjusted Cost | [1] | 1,772 | 1,772 |  |
Unrealized Gains | [1] | 0 | 0 |  |
Unrealized Losses | [1] | (203) | (144) |  |
Fair Value | [1] | 1,569 | 1,628 |  |
Cash and cash equivalents | [1] | 0 | 0 |  |
Short-term marketable securities | [1] | 1,569 | 1,628 |  |
Long-term marketable securities | [1] | 0 | 0 |  |
Level 2 |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Adjusted Cost | [2] | 218,680 | 191,461 |  |
Unrealized Gains | [2] | 945 | 574 |  |
Unrealized Losses | [2] | (1,263) | (1,184) |  |
Fair Value | [2] | 218,362 | 190,851 |  |
Cash and cash equivalents | [2] | 8,517 | 7,933 |  |
Short-term marketable securities | [2] | 32,200 | 18,853 |  |
Long-term marketable securities | [2] | 177,645 | 164,065 |  |
Level 2 | U.S. Treasury securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Adjusted Cost | [2] | 47,883 | 34,902 |  |
Unrealized Gains | [2] | 207 | 181 |  |
Unrealized Losses | [2] | (24) | (1) |  |
Fair Value | [2] | 48,066 | 35,082 |  |
Cash and cash equivalents | [2] | 3,753 | 0 |  |
Short-term marketable securities | [2] | 10,614 | 3,498 |  |
Long-term marketable securities | [2] | 33,699 | 31,584 |  |
Level 2 | U.S. agency securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Adjusted Cost | [2] | 6,641 | 5,864 |  |
Unrealized Gains | [2] | 12 | 14 |  |
Unrealized Losses | [2] | (2) | 0 |  |
Fair Value | [2] | 6,651 | 5,878 |  |
Cash and cash equivalents | [2] | 465 | 841 |  |
Short-term marketable securities | [2] | 2,703 | 767 |  |
Long-term marketable securities | [2] | 3,483 | 4,270 |  |
Level 2 | Non-U.S. government securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Adjusted Cost | [2] | 6,873 | 6,356 |  |
Unrealized Gains | [2] | 91 | 45 |  |
Unrealized Losses | [2] | (121) | (167) |  |
Fair Value | [2] | 6,843 | 6,234 |  |
Cash and cash equivalents | [2] | 0 | 43 |  |
Short-term marketable securities | [2] | 696 | 135 |  |
Long-term marketable securities | [2] | 6,147 | 6,056 |  |
Level 2 | Certificates of deposit and time deposits |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Adjusted Cost | [2] | 4,169 | 4,347 |  |
Unrealized Gains | [2] | 0 | 0 |  |
Unrealized Losses | [2] | 0 | 0 |  |
Fair Value | [2] | 4,169 | 4,347 |  |
Cash and cash equivalents | [2] | 1,529 | 2,065 |  |
Short-term marketable securities | [2] | 660 | 1,405 |  |
Long-term marketable securities | [2] | 1,980 | 877 |  |
Level 2 | Commercial paper |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Adjusted Cost | [2] | 4,500 | 6,016 |  |
Unrealized Gains | [2] | 0 | 0 |  |
Unrealized Losses | [2] | 0 | 0 |  |
Fair Value | [2] | 4,500 | 6,016 |  |
Cash and cash equivalents | [2] | 2,681 | 4,981 |  |
Short-term marketable securities | [2] | 1,819 | 1,035 |  |
Long-term marketable securities | [2] | 0 | 0 |  |
Level 2 | Corporate securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Adjusted Cost | [2] | 129,394 | 116,908 |  |
Unrealized Gains | [2] | 543 | 242 |  |
Unrealized Losses | [2] | (1,074) | (985) |  |
Fair Value | [2] | 128,863 | 116,165 |  |
Cash and cash equivalents | [2] | 89 | 3 |  |
Short-term marketable securities | [2] | 15,553 | 11,948 |  |
Long-term marketable securities | [2] | 113,221 | 104,214 |  |
Level 2 | Municipal securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Adjusted Cost | [2] | 952 | 947 |  |
Unrealized Gains | [2] | 6 | 5 |  |
Unrealized Losses | [2] | 0 | 0 |  |
Fair Value | [2] | 958 | 952 |  |
Cash and cash equivalents | [2] | 0 | 0 |  |
Short-term marketable securities | [2] | 72 | 48 |  |
Long-term marketable securities | [2] | 886 | 904 |  |
Level 2 | Mortgage- and asset-backed securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Adjusted Cost | [2] | 18,268 | 16,121 |  |
Unrealized Gains | [2] | 86 | 87 |  |
Unrealized Losses | [2] | (42) | (31) |  |
Fair Value | [2] | 18,312 | 16,177 |  |
Cash and cash equivalents | [2] | 0 | 0 |  |
Short-term marketable securities | [2] | 83 | 17 |  |
Long-term marketable securities | [2] | $ 18,229 | $ 16,160 |  |
[1] | The fair value of Level 1 securities is estimated based on quoted prices in active markets for identical assets or liabilities.
[2] | The fair value of Level 2 securities is estimated based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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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 -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: 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=49167202&loc=d3e26626-111562 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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