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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Millions
Mar. 27, 2021
Sep. 26, 2020
Debt Securities, Available-for-sale [Line Items]    
Cash and Cash Equivalents $ 38,466 $ 38,016
Current Marketable Securities 31,368 52,927
Non-Current Marketable Securities 134,539 100,887
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost 203,256 189,431
Cash Equivalents and Marketable Securities, Unrealized Gains 2,141 2,784
Cash Equivalents and Marketable Securities, Unrealized Losses 1,024 385
Cash, Cash Equivalents and Marketable Securities, Fair Value 204,373 191,830
Total marketable securities that were restricted from general use 19,000 18,600
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Equity, Adjusted Cost 12,141  
Marketable Securities, Equity, Unrealized Gains 1  
Marketable Securities, Equity, Unrealized Losses (2)  
Marketable Securities, Equity, Fair Value 12,140  
Cash and Cash Equivalents 11,998  
Current Marketable Securities 142  
Non-Current Marketable Securities 0  
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 171,671 169,487
Marketable Securities, Debt, Unrealized Gains 2,140 2,784
Marketable Securities, Debt, Unrealized Losses (1,022) (385)
Marketable Securities, Debt, Fair Value 172,789 171,886
Cash and Cash Equivalents 7,024 18,072
Current Marketable Securities 31,226 52,927
Non-Current Marketable Securities 134,539 100,887
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash 19,444 17,773
Cash and Cash Equivalents 19,444 17,773
Current Marketable Securities 0 0
Non-Current Marketable Securities 0 0
Money market funds | Level 1    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Equity, Adjusted Cost 11,998 2,171
Marketable Securities, Equity, Unrealized Gains 0 0
Marketable Securities, Equity, Unrealized Losses 0 0
Marketable Securities, Equity, Fair Value 11,998 2,171
Cash and Cash Equivalents 11,998 2,171
Current Marketable Securities 0 0
Non-Current Marketable Securities 0 0
Mutual funds | Level 1    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Equity, Adjusted Cost 143  
Marketable Securities, Equity, Unrealized Gains 1  
Marketable Securities, Equity, Unrealized Losses (2)  
Marketable Securities, Equity, Fair Value 142  
Cash and Cash Equivalents 0  
Current Marketable Securities 142  
Non-Current Marketable Securities 0  
U.S. Treasury securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 21,331 28,439
Marketable Securities, Debt, Unrealized Gains 168 331
Marketable Securities, Debt, Unrealized Losses (149) 0
Marketable Securities, Debt, Fair Value 21,350 28,770
Cash and Cash Equivalents 205 8,580
Current Marketable Securities 8,058 11,972
Non-Current Marketable Securities 13,087 8,218
U.S. agency securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 8,228 8,604
Marketable Securities, Debt, Unrealized Gains 5 8
Marketable Securities, Debt, Unrealized Losses (72) 0
Marketable Securities, Debt, Fair Value 8,161 8,612
Cash and Cash Equivalents 0 2,009
Current Marketable Securities 3,212 3,078
Non-Current Marketable Securities 4,949 3,525
Non-U.S. government securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 19,849 19,361
Marketable Securities, Debt, Unrealized Gains 211 275
Marketable Securities, Debt, Unrealized Losses (169) (186)
Marketable Securities, Debt, Fair Value 19,891 19,450
Cash and Cash Equivalents 200 255
Current Marketable Securities 2,881 3,329
Non-Current Marketable Securities 16,810 15,866
Certificates of deposit and time deposits | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 7,198 10,399
Marketable Securities, Debt, Unrealized Gains 0 0
Marketable Securities, Debt, Unrealized Losses 0 0
Marketable Securities, Debt, Fair Value 7,198 10,399
Cash and Cash Equivalents 5,814 4,043
Current Marketable Securities 1,114 6,246
Non-Current Marketable Securities 270 110
Commercial paper | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 3,353 11,226
Marketable Securities, Debt, Unrealized Gains 0 0
Marketable Securities, Debt, Unrealized Losses 0 0
Marketable Securities, Debt, Fair Value 3,353 11,226
Cash and Cash Equivalents 805 3,185
Current Marketable Securities 2,548 8,041
Non-Current Marketable Securities 0 0
Corporate debt securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 88,108 76,937
Marketable Securities, Debt, Unrealized Gains 1,506 1,834
Marketable Securities, Debt, Unrealized Losses (444) (175)
Marketable Securities, Debt, Fair Value 89,170 78,596
Cash and Cash Equivalents 0 0
Current Marketable Securities 13,036 19,687
Non-Current Marketable Securities 76,134 58,909
Municipal securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 980 1,001
Marketable Securities, Debt, Unrealized Gains 16 22
Marketable Securities, Debt, Unrealized Losses (1) 0
Marketable Securities, Debt, Fair Value 995 1,023
Cash and Cash Equivalents 0 0
Current Marketable Securities 136 139
Non-Current Marketable Securities 859 884
Mortgage- and asset-backed securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 22,624 13,520
Marketable Securities, Debt, Unrealized Gains 234 314
Marketable Securities, Debt, Unrealized Losses (187) (24)
Marketable Securities, Debt, Fair Value 22,671 13,810
Cash and Cash Equivalents 0 0
Current Marketable Securities 241 435
Non-Current Marketable Securities $ 22,430 $ 13,375