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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Jun. 29, 2019 | Sep. 29, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | $ 210,179 | $ 241,180
Unrealized Gains | 892 | 209
Unrealized Losses | (461) | (4,289)
Fair Value | 210,610 | 237,100
Cash and Cash Equivalents | 50,530 | 25,913
Short-Term Marketable Securities | 44,084 | 40,388
Long-Term Marketable Securities | 115,996 | 170,799
Total cash, cash equivalents and marketable securities that were restricted from general use | 19,500 | 20,300
Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 10,558 | 8,882
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | (116)
Fair Value | 10,558 | 8,766
Cash and Cash Equivalents | 10,558 | 8,083
Short-Term Marketable Securities | 0 | 683
Long-Term Marketable Securities | 0 | 0
Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 187,546 | 220,723
Unrealized Gains | 892 | 209
Unrealized Losses | (461) | (4,173)
Fair Value | 187,977 | 216,759
Cash and Cash Equivalents | 27,897 | 6,255
Short-Term Marketable Securities | 44,084 | 39,705
Long-Term Marketable Securities | 115,996 | 170,799
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 12,075 | 11,575
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 12,075 | 11,575
Cash and Cash Equivalents | 12,075 | 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 | 10,558 | 8,083
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 10,558 | 8,083
Cash and Cash Equivalents | 10,558 | 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 |  | 799
Unrealized Gains |  | 0
Unrealized Losses |  | (116)
Fair Value |  | 683
Cash and Cash Equivalents |  | 0
Short-Term Marketable Securities |  | 683
Long-Term Marketable Securities |  | 0
U.S. Treasury securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 37,307 | 47,296
Unrealized Gains | 22 | 0
Unrealized Losses | (102) | (1,202)
Fair Value | 37,227 | 46,094
Cash and Cash Equivalents | 11,116 | 1,613
Short-Term Marketable Securities | 8,436 | 7,606
Long-Term Marketable Securities | 17,675 | 36,875
U.S. agency securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 9,552 | 4,127
Unrealized Gains | 1 | 0
Unrealized Losses | (5) | (48)
Fair Value | 9,548 | 4,079
Cash and Cash Equivalents | 7,711 | 1,732
Short-Term Marketable Securities | 450 | 360
Long-Term Marketable Securities | 1,387 | 1,987
Non-U.S. government securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 20,569 | 21,601
Unrealized Gains | 272 | 49
Unrealized Losses | (63) | (250)
Fair Value | 20,778 | 21,400
Cash and Cash Equivalents | 636 | 0
Short-Term Marketable Securities | 3,467 | 3,355
Long-Term Marketable Securities | 16,675 | 18,045
Certificates of deposit and time deposits | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 4,838 | 3,074
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 4,838 | 3,074
Cash and Cash Equivalents | 3,495 | 1,247
Short-Term Marketable Securities | 1,273 | 1,330
Long-Term Marketable Securities | 70 | 497
Commercial paper | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 5,161 | 2,573
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 5,161 | 2,573
Cash and Cash Equivalents | 4,930 | 1,663
Short-Term Marketable Securities | 231 | 910
Long-Term Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 93,896 | 123,001
Unrealized Gains | 550 | 152
Unrealized Losses | (173) | (2,038)
Fair Value | 94,273 | 121,115
Cash and Cash Equivalents | 9 | 0
Short-Term Marketable Securities | 29,027 | 25,162
Long-Term Marketable Securities | 65,237 | 95,953
Municipal securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 961 | 946
Unrealized Gains | 9 | 0
Unrealized Losses | (1) | (12)
Fair Value | 969 | 934
Cash and Cash Equivalents | 0 | 0
Short-Term Marketable Securities | 65 | 178
Long-Term Marketable Securities | 904 | 756
Mortgage- and asset-backed securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 15,262 | 18,105
Unrealized Gains | 38 | 8
Unrealized Losses | (117) | (623)
Fair Value | 15,183 | 17,490
Cash and Cash Equivalents | 0 | 0
Short-Term Marketable Securities | 1,135 | 804
Long-Term Marketable Securities | $ 14,048 | $ 16,686

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