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Fair Value Measurements (Tables)
 6 Months Ended
Mar. 29, 2020
Fair Value Measurements [Abstract]  
Fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
The following table presents our fair value hierarchy for assets and liabilities measured at fair value on a recurring basis at March 29, 2020 (in millions):
Level 1Level 2Level 3Total
Assets    
Cash equivalents$2,898  $4,529  $—  $7,427  
Marketable securities:    
U.S. Treasury securities and government-related securities—  3  —  3  
Corporate bonds and notes—  1,253  —  1,253  
Mortgage- and asset-backed and auction rate securities—  48  33  81  
Equity securities239  —  —  239  
Total marketable securities239  1,304  33  1,576  
Derivative instruments—  9  —  9  
Other investments404  —  39  443  
Total assets measured at fair value$3,541  $5,842  $72  $9,455  
Liabilities    
Derivative instruments$—  $29  $—  $29  
Other liabilities405  —  39  444  
Total liabilities measured at fair value$405  $29  $39  $473