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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Sep. 29, 2018 | Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | $ 241,180 | $ 268,399 |  |
Unrealized Gains | 209 | 1,278 |  |
Unrealized Losses | (4,289) | (782) |  |
Fair Value | 237,100 | 268,895 |  |
Cash and Cash Equivalents | 25,913 | 20,289 | $ 20,484 | $ 21,120
Short-Term Marketable Securities | 40,388 | 53,892 |  |
Long-Term Marketable Securities | 170,799 | 194,714 |  |
Total cash, cash equivalents and marketable securities that were restricted from general use | 20,300 |  |  |
Cash |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 11,575 | 7,982 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 11,575 | 7,982 |  |
Cash and Cash Equivalents | 11,575 | 7,982 |  |
Short-Term Marketable Securities | 0 | 0 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Level 1 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 8,882 | 7,333 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | (116) | (88) |  |
Fair Value | 8,766 | 7,245 |  |
Cash and Cash Equivalents | 8,083 | 6,534 |  |
Short-Term Marketable Securities | 683 | 711 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Level 1 | Money market funds |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 8,083 | 6,534 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 8,083 | 6,534 |  |
Cash and Cash Equivalents | 8,083 | 6,534 |  |
Short-Term Marketable Securities | 0 | 0 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Level 1 | Mutual funds |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 799 | 799 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | (116) | (88) |  |
Fair Value | 683 | 711 |  |
Cash and Cash Equivalents | 0 | 0 |  |
Short-Term Marketable Securities | 683 | 711 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Level 2 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 220,723 | 253,084 |  |
Unrealized Gains | 209 | 1,278 |  |
Unrealized Losses | (4,173) | (694) |  |
Fair Value | 216,759 | 253,668 |  |
Cash and Cash Equivalents | 6,255 | 5,773 |  |
Short-Term Marketable Securities | 39,705 | 53,181 |  |
Long-Term Marketable Securities | 170,799 | 194,714 |  |
Level 2 | U.S. Treasury securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 47,296 | 55,254 |  |
Unrealized Gains | 0 | 58 |  |
Unrealized Losses | (1,202) | (230) |  |
Fair Value | 46,094 | 55,082 |  |
Cash and Cash Equivalents | 1,613 | 865 |  |
Short-Term Marketable Securities | 7,606 | 17,228 |  |
Long-Term Marketable Securities | 36,875 | 36,989 |  |
Level 2 | U.S. agency securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 4,127 | 5,162 |  |
Unrealized Gains | 0 | 2 |  |
Unrealized Losses | (48) | (9) |  |
Fair Value | 4,079 | 5,155 |  |
Cash and Cash Equivalents | 1,732 | 1,439 |  |
Short-Term Marketable Securities | 360 | 2,057 |  |
Long-Term Marketable Securities | 1,987 | 1,659 |  |
Level 2 | Non-U.S. government securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 21,601 | 7,827 |  |
Unrealized Gains | 49 | 210 |  |
Unrealized Losses | (250) | (37) |  |
Fair Value | 21,400 | 8,000 |  |
Cash and Cash Equivalents | 0 | 9 |  |
Short-Term Marketable Securities | 3,355 | 123 |  |
Long-Term Marketable Securities | 18,045 | 7,868 |  |
Level 2 | Certificates of deposit and time deposits |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 3,074 | 5,832 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 3,074 | 5,832 |  |
Cash and Cash Equivalents | 1,247 | 1,142 |  |
Short-Term Marketable Securities | 1,330 | 3,918 |  |
Long-Term Marketable Securities | 497 | 772 |  |
Level 2 | Commercial paper |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 2,573 | 3,640 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 2,573 | 3,640 |  |
Cash and Cash Equivalents | 1,663 | 2,146 |  |
Short-Term Marketable Securities | 910 | 1,494 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Level 2 | Corporate securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 123,001 | 152,724 |  |
Unrealized Gains | 152 | 969 |  |
Unrealized Losses | (2,038) | (242) |  |
Fair Value | 121,115 | 153,451 |  |
Cash and Cash Equivalents | 0 | 172 |  |
Short-Term Marketable Securities | 25,162 | 27,591 |  |
Long-Term Marketable Securities | 95,953 | 125,688 |  |
Level 2 | Municipal securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 946 | 961 |  |
Unrealized Gains | 0 | 4 |  |
Unrealized Losses | (12) | (1) |  |
Fair Value | 934 | 964 |  |
Cash and Cash Equivalents | 0 | 0 |  |
Short-Term Marketable Securities | 178 | 114 |  |
Long-Term Marketable Securities | 756 | 850 |  |
Level 2 | Mortgage- and asset-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 18,105 | 21,684 |  |
Unrealized Gains | 8 | 35 |  |
Unrealized Losses | (623) | (175) |  |
Fair Value | 17,490 | 21,544 |  |
Cash and Cash Equivalents | 0 | 0 |  |
Short-Term Marketable Securities | 804 | 656 |  |
Long-Term Marketable Securities | $ 16,686 | $ 20,888 |  |

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