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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Sep. 30, 2017 | Jul. 01, 2017 | Sep. 24, 2016
--- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | $ 247,864 | $ 268,399 |  |
Unrealized Gains | 179 | 1,278 |  |
Unrealized Losses | (4,300) | (782) |  |
Fair Value | 243,743 | 268,895 |  |
Cash and Cash Equivalents | 31,971 | 20,289 | $ 18,571 | $ 20,484
Short-Term Marketable Securities | 38,999 | 53,892 |  |
Long-Term Marketable Securities | 172,773 | 194,714 |  |
Total cash, cash equivalents and marketable securities that were restricted from general use | 8,800 |  |  |
Cash |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 9,973 | 7,982 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 9,973 | 7,982 |  |
Cash and Cash Equivalents | 9,973 | 7,982 |  |
Short-Term Marketable Securities | 0 | 0 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 8,521 | 7,333 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | (112) | (88) |  |
Fair Value | 8,409 | 7,245 |  |
Cash and Cash Equivalents | 7,722 | 6,534 |  |
Short-Term Marketable Securities | 687 | 711 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Level 1 | Money market funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 7,722 | 6,534 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 7,722 | 6,534 |  |
Cash and Cash Equivalents | 7,722 | 6,534 |  |
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 | 799 | 799 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | (112) | (88) |  |
Fair Value | 687 | 711 |  |
Cash and Cash Equivalents | 0 | 0 |  |
Short-Term Marketable Securities | 687 | 711 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Level 2 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 229,370 | 253,084 |  |
Unrealized Gains | 179 | 1,278 |  |
Unrealized Losses | (4,188) | (694) |  |
Fair Value | 225,361 | 253,668 |  |
Cash and Cash Equivalents | 14,276 | 5,773 |  |
Short-Term Marketable Securities | 38,312 | 53,181 |  |
Long-Term Marketable Securities | 172,773 | 194,714 |  |
Level 2 | U.S. Treasury securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 47,056 | 55,254 |  |
Unrealized Gains | 1 | 58 |  |
Unrealized Losses | (1,055) | (230) |  |
Fair Value | 46,002 | 55,082 |  |
Cash and Cash Equivalents | 350 | 865 |  |
Short-Term Marketable Securities | 7,262 | 17,228 |  |
Long-Term Marketable Securities | 38,390 | 36,989 |  |
Level 2 | U.S. agency securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 6,994 | 5,162 |  |
Unrealized Gains | 0 | 2 |  |
Unrealized Losses | (44) | (9) |  |
Fair Value | 6,950 | 5,155 |  |
Cash and Cash Equivalents | 4,477 | 1,439 |  |
Short-Term Marketable Securities | 483 | 2,057 |  |
Long-Term Marketable Securities | 1,990 | 1,659 |  |
Level 2 | Non-U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 11,774 | 7,827 |  |
Unrealized Gains | 40 | 210 |  |
Unrealized Losses | (282) | (37) |  |
Fair Value | 11,532 | 8,000 |  |
Cash and Cash Equivalents | 0 | 9 |  |
Short-Term Marketable Securities | 1,124 | 123 |  |
Long-Term Marketable Securities | 10,408 | 7,868 |  |
Level 2 | Certificates of deposit and time deposits |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 5,662 | 5,832 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 5,662 | 5,832 |  |
Cash and Cash Equivalents | 3,649 | 1,142 |  |
Short-Term Marketable Securities | 1,412 | 3,918 |  |
Long-Term Marketable Securities | 601 | 772 |  |
Level 2 | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 7,064 | 3,640 |  |
Unrealized Gains | 0 | 0 |  |
Unrealized Losses | 0 | 0 |  |
Fair Value | 7,064 | 3,640 |  |
Cash and Cash Equivalents | 5,653 | 2,146 |  |
Short-Term Marketable Securities | 1,411 | 1,494 |  |
Long-Term Marketable Securities | 0 | 0 |  |
Level 2 | Corporate securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 130,945 | 152,724 |  |
Unrealized Gains | 129 | 969 |  |
Unrealized Losses | (2,246) | (242) |  |
Fair Value | 128,828 | 153,451 |  |
Cash and Cash Equivalents | 147 | 172 |  |
Short-Term Marketable Securities | 25,874 | 27,591 |  |
Long-Term Marketable Securities | 102,807 | 125,688 |  |
Level 2 | Municipal securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 956 | 961 |  |
Unrealized Gains | 0 | 4 |  |
Unrealized Losses | (8) | (1) |  |
Fair Value | 948 | 964 |  |
Cash and Cash Equivalents | 0 | 0 |  |
Short-Term Marketable Securities | 172 | 114 |  |
Long-Term Marketable Securities | 776 | 850 |  |
Level 2 | Mortgage- and asset-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Adjusted Cost | 18,919 | 21,684 |  |
Unrealized Gains | 9 | 35 |  |
Unrealized Losses | (553) | (175) |  |
Fair Value | 18,375 | 21,544 |  |
Cash and Cash Equivalents | 0 | 0 |  |
Short-Term Marketable Securities | 574 | 656 |  |
Long-Term Marketable Securities | $ 17,801 | $ 20,888 |  |

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