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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Dec. 29, 2018 | Sep. 29, 2018 | Dec. 30, 2017 | Sep. 30, 2017
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | $ 248,812 | $ 241,180 |  |
Unrealized Gains | 94 | 209 |  |
Unrealized Losses | (3,871) | (4,289) |  |
Fair Value | 245,035 | 237,100 |  |
Cash and Cash Equivalents | 44,771 | 25,913 | $ 27,491 | $ 20,289
Short-Term Marketable Securities | 41,656 | 40,388 |  |
Long-Term Marketable Securities | 158,608 | 170,799 |  |
Total cash, cash equivalents and marketable securities that were restricted from general use | 19,900 | 20,300 |  |
Level 1 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 7,106 | 8,882 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | (116) |  |
Fair Value | 7,106 | 8,766 |  |
Cash and Cash Equivalents | 6,424 | 8,083 |  |
Short-Term Marketable Securities | 682 | 683 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Level 2 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 232,217 | 220,723 |  |
Unrealized Gains | 94 | 209 |  |
Unrealized Losses | (3,871) | (4,173) |  |
Fair Value | 228,440 | 216,759 |  |
Cash and Cash Equivalents | 28,858 | 6,255 |  |
Short-Term Marketable Securities | 40,974 | 39,705 |  |
Long-Term Marketable Securities | 158,608 | 170,799 |  |
Cash |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 9,489 | 11,575 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 9,489 | 11,575 |  |
Cash and Cash Equivalents | 9,489 | 11,575 |  |
Short-Term Marketable Securities | 0 | 0 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Money market funds | Level 1 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 6,424 | 8,083 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 6,424 | 8,083 |  |
Cash and Cash Equivalents | 6,424 | 8,083 |  |
Short-Term Marketable Securities | 0 | 0 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Mutual funds | Level 1 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 682 | 799 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | (116) |  |
Fair Value | 682 | 683 |  |
Cash and Cash Equivalents | 0 | 0 |  |
Short-Term Marketable Securities | 682 | 683 |  |
Long-Term Marketable Securities | 0 | 0 |  |
U.S. Treasury securities | Level 2 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 46,191 | 47,296 |  |
Unrealized Gains | 6 | 0 |  |
Unrealized Losses | (729) | (1,202) |  |
Fair Value | 45,468 | 46,094 |  |
Cash and Cash Equivalents | 3,923 | 1,613 |  |
Short-Term Marketable Securities | 6,415 | 7,606 |  |
Long-Term Marketable Securities | 35,130 | 36,875 |  |
U.S. agency securities | Level 2 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 9,731 | 4,127 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | (31) | (48) |  |
Fair Value | 9,700 | 4,079 |  |
Cash and Cash Equivalents | 7,552 | 1,732 |  |
Short-Term Marketable Securities | 597 | 360 |  |
Long-Term Marketable Securities | 1,551 | 1,987 |  |
Non-U.S. government securities | Level 2 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 23,460 | 21,601 |  |
Unrealized Gains | 48 | 49 |  |
Unrealized Losses | (289) | (250) |  |
Fair Value | 23,219 | 21,400 |  |
Cash and Cash Equivalents | 1,895 | 0 |  |
Short-Term Marketable Securities | 4,129 | 3,355 |  |
Long-Term Marketable Securities | 17,195 | 18,045 |  |
Certificates of deposit and time deposits | Level 2 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 5,349 | 3,074 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 5,349 | 3,074 |  |
Cash and Cash Equivalents | 3,705 | 1,247 |  |
Short-Term Marketable Securities | 1,348 | 1,330 |  |
Long-Term Marketable Securities | 296 | 497 |  |
Commercial paper | Level 2 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 11,953 | 2,573 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 11,953 | 2,573 |  |
Cash and Cash Equivalents | 11,679 | 1,663 |  |
Short-Term Marketable Securities | 274 | 910 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Corporate debt securities | Level 2 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 117,260 | 123,001 |  |
Unrealized Gains | 32 | 152 |  |
Unrealized Losses | (2,387) | (2,038) |  |
Fair Value | 114,905 | 121,115 |  |
Cash and Cash Equivalents | 104 | 0 |  |
Short-Term Marketable Securities | 27,134 | 25,162 |  |
Long-Term Marketable Securities | 87,667 | 95,953 |  |
Municipal securities | Level 2 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 953 | 946 |  |
Unrealized Gains | 1 | 0 |  |
Unrealized Losses | (7) | (12) |  |
Fair Value | 947 | 934 |  |
Cash and Cash Equivalents | 0 | 0 |  |
Short-Term Marketable Securities | 187 | 178 |  |
Long-Term Marketable Securities | 760 | 756 |  |
Mortgage- and asset-backed securities | Level 2 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost | 17,320 | 18,105 |  |
Unrealized Gains | 7 | 8 |  |
Unrealized Losses | (428) | (623) |  |
Fair Value | 16,899 | 17,490 |  |
Cash and Cash Equivalents | 0 | 0 |  |
Short-Term Marketable Securities | 890 | 804 |  |
Long-Term Marketable Securities | $ 16,009 | $ 16,686 |  |

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