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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Millions
Sep. 24, 2022
Sep. 25, 2021
Debt Securities, Available-for-sale [Line Items]    
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost $ 183,061 $ 189,961
Cash Equivalents and Marketable Securities, Unrealized Gains 11 1,753
Cash Equivalents and Marketable Securities, Unrealized Loss (13,963) (1,198)
Cash, Cash Equivalents and Marketable Securities, Fair Value 169,109 190,516
Cash and Cash Equivalents 23,646 34,940
Current Marketable Securities 24,658 27,699
Non-Current Marketable Securities 120,805 127,877
Total marketable securities that were restricted from general use 12,700 17,900
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Equity, Adjusted Cost 3,203 9,783
Marketable Securities, Equity, Unrealized Gains 0 11
Marketable Securities, Equity, Unrealized Losses (47) (1)
Marketable Securities, Equity, Fair Value 3,156 9,793
Cash and Cash Equivalents 2,929 9,608
Current Marketable Securities 227 185
Non-Current Marketable Securities 0 0
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 161,312 162,873
Marketable Securities, Debt, Unrealized Gains 11 1,742
Marketable Securities, Debt, Unrealized Losses (13,916) (1,197)
Marketable Securities, Debt, Fair Value 147,407 163,418
Cash and Cash Equivalents 2,171 8,027
Current Marketable Securities 24,431 27,514
Non-Current Marketable Securities 120,805 127,877
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash 18,546 17,305
Cash and Cash Equivalents 18,546 17,305
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 2,929 9,608
Marketable Securities, Equity, Unrealized Gains 0 0
Marketable Securities, Equity, Unrealized Losses 0 0
Marketable Securities, Equity, Fair Value 2,929 9,608
Cash and Cash Equivalents 2,929 9,608
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 274 175
Marketable Securities, Equity, Unrealized Gains 0 11
Marketable Securities, Equity, Unrealized Losses (47) (1)
Marketable Securities, Equity, Fair Value 227 185
Cash and Cash Equivalents 0 0
Current Marketable Securities 227 185
Non-Current Marketable Securities 0 0
Equity securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Equity, Adjusted Cost   1,527
Marketable Securities, Equity, Unrealized Gains   0
Marketable Securities, Equity, Unrealized Losses   (564)
Marketable Securities, Equity, Fair Value   963
Cash and Cash Equivalents   0
Current Marketable Securities   963
Non-Current Marketable Securities   0
U.S. Treasury securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 25,134 22,878
Marketable Securities, Debt, Unrealized Gains 0 102
Marketable Securities, Debt, Unrealized Losses (1,725) (77)
Marketable Securities, Debt, Fair Value 23,409 22,903
Cash and Cash Equivalents 338 3,596
Current Marketable Securities 5,091 6,625
Non-Current Marketable Securities 17,980 12,682
U.S. agency securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 5,823 8,949
Marketable Securities, Debt, Unrealized Gains 0 2
Marketable Securities, Debt, Unrealized Losses (655) (64)
Marketable Securities, Debt, Fair Value 5,168 8,887
Cash and Cash Equivalents 0 1,775
Current Marketable Securities 240 1,930
Non-Current Marketable Securities 4,928 5,182
Non-U.S. government securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 16,948 20,201
Marketable Securities, Debt, Unrealized Gains 2 211
Marketable Securities, Debt, Unrealized Losses (1,201) (101)
Marketable Securities, Debt, Fair Value 15,749 20,311
Cash and Cash Equivalents 0 390
Current Marketable Securities 8,806 3,091
Non-Current Marketable Securities 6,943 16,830
Certificates of deposit and time deposits | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 2,067 1,300
Marketable Securities, Debt, Unrealized Gains 0 0
Marketable Securities, Debt, Unrealized Losses 0 0
Marketable Securities, Debt, Fair Value 2,067 1,300
Cash and Cash Equivalents 1,805 490
Current Marketable Securities 262 810
Non-Current Marketable Securities 0 0
Commercial paper | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 718 2,639
Marketable Securities, Debt, Unrealized Gains 0 0
Marketable Securities, Debt, Unrealized Losses 0 0
Marketable Securities, Debt, Fair Value 718 2,639
Cash and Cash Equivalents 28 1,776
Current Marketable Securities 690 863
Non-Current Marketable Securities 0 0
Corporate debt securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 87,148 83,883
Marketable Securities, Debt, Unrealized Gains 9 1,242
Marketable Securities, Debt, Unrealized Losses (7,707) (267)
Marketable Securities, Debt, Fair Value 79,450 84,858
Cash and Cash Equivalents 0 0
Current Marketable Securities 9,023 12,327
Non-Current Marketable Securities 70,427 72,531
Municipal securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 921 967
Marketable Securities, Debt, Unrealized Gains 0 14
Marketable Securities, Debt, Unrealized Losses (35) 0
Marketable Securities, Debt, Fair Value 886 981
Cash and Cash Equivalents 0 0
Current Marketable Securities 266 130
Non-Current Marketable Securities 620 851
Mortgage- and asset-backed securities | Level 2    
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Debt, Adjusted Cost 22,553 20,529
Marketable Securities, Debt, Unrealized Gains 0 171
Marketable Securities, Debt, Unrealized Losses (2,593) (124)
Marketable Securities, Debt, Fair Value 19,960 20,576
Cash and Cash Equivalents 0 0
Current Marketable Securities 53 775
Non-Current Marketable Securities $ 19,907 $ 19,801