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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Millions
Jun. 26, 2021
Sep. 26, 2020
Debt Securities, Available-for-sale [Line Items]    
Cash and Cash Equivalents $ 34,050 $ 38,016
Current Marketable Securities 27,646 52,927
Non-Current Marketable Securities 131,948 100,887
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost 192,304 189,431
Cash Equivalents and Marketable Securities, Unrealized Gains 2,046 2,784
Cash Equivalents and Marketable Securities, Unrealized Losses 706 385
Cash, Cash Equivalents and Marketable Securities, Fair Value 193,644 191,830
Total marketable securities that were restricted from general use 18,900 18,600
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Equity, Adjusted Cost 9,727  
Marketable Securities, Equity, Unrealized Gains 8  
Marketable Securities, Equity, Unrealized Losses 0  
Marketable Securities, Equity, Fair Value 9,735  
Cash and Cash Equivalents 9,568  
Current Marketable Securities 167  
Non-Current Marketable Securities 0  
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 167,724 169,487
Marketable Securities, Debt, Unrealized Gains 2,038 2,784
Marketable Securities, Debt, Unrealized Losses (706) (385)
Marketable Securities, Debt, Fair Value 169,056 171,886
Cash and Cash Equivalents 9,629 18,072
Current Marketable Securities 27,479 52,927
Non-Current Marketable Securities 131,948 100,887
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash 14,853 17,773
Cash and Cash Equivalents 14,853 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 9,568 2,171
Marketable Securities, Equity, Unrealized Gains 0 0
Marketable Securities, Equity, Unrealized Losses 0 0
Marketable Securities, Equity, Fair Value 9,568 2,171
Cash and Cash Equivalents 9,568 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 159  
Marketable Securities, Equity, Unrealized Gains 8  
Marketable Securities, Equity, Unrealized Losses 0  
Marketable Securities, Equity, Fair Value 167  
Cash and Cash Equivalents 0  
Current Marketable Securities 167  
Non-Current Marketable Securities 0  
U.S. Treasury securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 22,582 28,439
Marketable Securities, Debt, Unrealized Gains 133 331
Marketable Securities, Debt, Unrealized Losses (112) 0
Marketable Securities, Debt, Fair Value 22,603 28,770
Cash and Cash Equivalents 1,602 8,580
Current Marketable Securities 8,083 11,972
Non-Current Marketable Securities 12,918 8,218
U.S. agency securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 7,542 8,604
Marketable Securities, Debt, Unrealized Gains 3 8
Marketable Securities, Debt, Unrealized Losses (69) 0
Marketable Securities, Debt, Fair Value 7,476 8,612
Cash and Cash Equivalents 410 2,009
Current Marketable Securities 1,781 3,078
Non-Current Marketable Securities 5,285 3,525
Non-U.S. government securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 20,007 19,361
Marketable Securities, Debt, Unrealized Gains 252 275
Marketable Securities, Debt, Unrealized Losses (92) (186)
Marketable Securities, Debt, Fair Value 20,167 19,450
Cash and Cash Equivalents 118 255
Current Marketable Securities 3,537 3,329
Non-Current Marketable Securities 16,512 15,866
Certificates of deposit and time deposits | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 7,099 10,399
Marketable Securities, Debt, Unrealized Gains 0 0
Marketable Securities, Debt, Unrealized Losses 0 0
Marketable Securities, Debt, Fair Value 7,099 10,399
Cash and Cash Equivalents 6,362 4,043
Current Marketable Securities 466 6,246
Non-Current Marketable Securities 271 110
Commercial paper | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 2,056 11,226
Marketable Securities, Debt, Unrealized Gains 0 0
Marketable Securities, Debt, Unrealized Losses 0 0
Marketable Securities, Debt, Fair Value 2,056 11,226
Cash and Cash Equivalents 1,137 3,185
Current Marketable Securities 919 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 85,221 76,937
Marketable Securities, Debt, Unrealized Gains 1,444 1,834
Marketable Securities, Debt, Unrealized Losses (276) (175)
Marketable Securities, Debt, Fair Value 86,389 78,596
Cash and Cash Equivalents 0 0
Current Marketable Securities 11,903 19,687
Non-Current Marketable Securities 74,486 58,909
Municipal securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 984 1,001
Marketable Securities, Debt, Unrealized Gains 15 22
Marketable Securities, Debt, Unrealized Losses 0 0
Marketable Securities, Debt, Fair Value 999 1,023
Cash and Cash Equivalents 0 0
Current Marketable Securities 128 139
Non-Current Marketable Securities 871 884
Mortgage- and asset-backed securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 22,233 13,520
Marketable Securities, Debt, Unrealized Gains 191 314
Marketable Securities, Debt, Unrealized Losses (157) (24)
Marketable Securities, Debt, Fair Value 22,267 13,810
Cash and Cash Equivalents 0 0
Current Marketable Securities 662 435
Non-Current Marketable Securities $ 21,605 $ 13,375