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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Mar. 30, 2019 | Sep. 29, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | $ 226,558 | $ 241,180
Unrealized Gains | 385 | 209
Unrealized Losses | (1,532) | (4,289)
Fair Value | 225,411 | 237,100
Cash and Cash Equivalents | 37,988 | 25,913
Short-Term Marketable Securities | 42,104 | 40,388
Long-Term Marketable Securities | 145,319 | 170,799
Total cash, cash equivalents and marketable securities that were restricted from general use | 19,300 | 20,300
Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 8,719 | 8,882
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | (116)
Fair Value | 8,719 | 8,766
Cash and Cash Equivalents | 8,719 | 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 | 206,088 | 220,723
Unrealized Gains | 385 | 209
Unrealized Losses | (1,532) | (4,173)
Fair Value | 204,941 | 216,759
Cash and Cash Equivalents | 17,518 | 6,255
Short-Term Marketable Securities | 42,104 | 39,705
Long-Term Marketable Securities | 145,319 | 170,799
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 11,751 | 11,575
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 11,751 | 11,575
Cash and Cash Equivalents | 11,751 | 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 | 8,719 | 8,083
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 8,719 | 8,083
Cash and Cash Equivalents | 8,719 | 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 | 48,215 | 47,296
Unrealized Gains | 6 | 0
Unrealized Losses | (401) | (1,202)
Fair Value | 47,820 | 46,094
Cash and Cash Equivalents | 8,815 | 1,613
Short-Term Marketable Securities | 6,957 | 7,606
Long-Term Marketable Securities | 32,048 | 36,875
U.S. agency securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 6,458 | 4,127
Unrealized Gains | 0 | 0
Unrealized Losses | (19) | (48)
Fair Value | 6,439 | 4,079
Cash and Cash Equivalents | 4,354 | 1,732
Short-Term Marketable Securities | 526 | 360
Long-Term Marketable Securities | 1,559 | 1,987
Non-U.S. government securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 21,572 | 21,601
Unrealized Gains | 132 | 49
Unrealized Losses | (108) | (250)
Fair Value | 21,596 | 21,400
Cash and Cash Equivalents | 243 | 0
Short-Term Marketable Securities | 3,992 | 3,355
Long-Term Marketable Securities | 17,361 | 18,045
Certificates of deposit and time deposits | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 3,472 | 3,074
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 3,472 | 3,074
Cash and Cash Equivalents | 1,980 | 1,247
Short-Term Marketable Securities | 1,372 | 1,330
Long-Term Marketable Securities | 120 | 497
Commercial paper | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 2,150 | 2,573
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 2,150 | 2,573
Cash and Cash Equivalents | 2,122 | 1,663
Short-Term Marketable Securities | 28 | 910
Long-Term Marketable Securities | 0 | 0
Corporate debt securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 106,837 | 123,001
Unrealized Gains | 228 | 152
Unrealized Losses | (730) | (2,038)
Fair Value | 106,335 | 121,115
Cash and Cash Equivalents | 4 | 0
Short-Term Marketable Securities | 28,164 | 25,162
Long-Term Marketable Securities | 78,167 | 95,953
Municipal securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 946 | 946
Unrealized Gains | 4 | 0
Unrealized Losses | (2) | (12)
Fair Value | 948 | 934
Cash and Cash Equivalents | 0 | 0
Short-Term Marketable Securities | 75 | 178
Long-Term Marketable Securities | 873 | 756
Mortgage- and asset-backed securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 16,438 | 18,105
Unrealized Gains | 15 | 8
Unrealized Losses | (272) | (623)
Fair Value | 16,181 | 17,490
Cash and Cash Equivalents | 0 | 0
Short-Term Marketable Securities | 990 | 804
Long-Term Marketable Securities | $ 15,191 | $ 16,686

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