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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Sep. 28, 2019 | Sep. 29, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | $ 204,977 | $ 241,180
Unrealized Gains | 1,202 | 209
Unrealized Losses | (281) | (4,289)
Fair Value | 205,898 | 237,100
Cash and Cash Equivalents | 48,844 | 25,913
Short-Term Marketable Securities | 51,713 | 40,388
Long-Term Marketable Securities | 105,341 | 170,799
Total cash, cash equivalents and marketable securities that were restricted from general use | 18,900 | 20,300
Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 15,897 | 8,882
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | (116)
Fair Value | 15,897 | 8,766
Cash and Cash Equivalents | 15,897 | 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 | 176,876 | 220,723
Unrealized Gains | 1,202 | 209
Unrealized Losses | (281) | (4,173)
Fair Value | 177,797 | 216,759
Cash and Cash Equivalents | 20,743 | 6,255
Short-Term Marketable Securities | 51,713 | 39,705
Long-Term Marketable Securities | 105,341 | 170,799
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 12,204 | 11,575
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 12,204 | 11,575
Cash and Cash Equivalents | 12,204 | 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 | 15,897 | 8,083
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 15,897 | 8,083
Cash and Cash Equivalents | 15,897 | 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 | 30,293 | 47,296
Unrealized Gains | 33 | 0
Unrealized Losses | (62) | (1,202)
Fair Value | 30,264 | 46,094
Cash and Cash Equivalents | 6,165 | 1,613
Short-Term Marketable Securities | 9,817 | 7,606
Long-Term Marketable Securities | 14,282 | 36,875
U.S. agency securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 9,767 | 4,127
Unrealized Gains | 1 | 0
Unrealized Losses | (3) | (48)
Fair Value | 9,765 | 4,079
Cash and Cash Equivalents | 6,489 | 1,732
Short-Term Marketable Securities | 2,249 | 360
Long-Term Marketable Securities | 1,027 | 1,987
Non-U.S. government securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 19,821 | 21,601
Unrealized Gains | 337 | 49
Unrealized Losses | (50) | (250)
Fair Value | 20,108 | 21,400
Cash and Cash Equivalents | 749 | 0
Short-Term Marketable Securities | 3,168 | 3,355
Long-Term Marketable Securities | 16,191 | 18,045
Certificates of deposit and time deposits | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 4,041 | 3,074
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 4,041 | 3,074
Cash and Cash Equivalents | 2,024 | 1,247
Short-Term Marketable Securities | 1,922 | 1,330
Long-Term Marketable Securities | 95 | 497
Commercial paper | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 12,433 | 2,573
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 12,433 | 2,573
Cash and Cash Equivalents | 5,193 | 1,663
Short-Term Marketable Securities | 7,240 | 910
Long-Term Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 85,383 | 123,001
Unrealized Gains | 756 | 152
Unrealized Losses | (92) | (2,038)
Fair Value | 86,047 | 121,115
Cash and Cash Equivalents | 123 | 0
Short-Term Marketable Securities | 26,127 | 25,162
Long-Term Marketable Securities | 59,797 | 95,953
Municipal securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 958 | 946
Unrealized Gains | 8 | 0
Unrealized Losses | (1) | (12)
Fair Value | 965 | 934
Cash and Cash Equivalents | 0 | 0
Short-Term Marketable Securities | 68 | 178
Long-Term Marketable Securities | 897 | 756
Mortgage- and asset-backed securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 14,180 | 18,105
Unrealized Gains | 67 | 8
Unrealized Losses | (73) | (623)
Fair Value | 14,174 | 17,490
Cash and Cash Equivalents | 0 | 0
Short-Term Marketable Securities | 1,122 | 804
Long-Term Marketable Securities | $ 13,052 | $ 16,686

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