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Marketable Securities (Notes)
 3 Months Ended
Dec. 27, 2020
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
We classify marketable securities as current or noncurrent based on the nature of the securities and their availability for use in current operations. Our marketable securities were comprised as follows (in millions):
CurrentNoncurrent (1)
December 27,
2020		September 27,
2020		December 27,
2020		September 27,
2020
Available-for-sale debt securities:    
U.S. Treasury securities and government-related securities$27 $10 $— $— 
Corporate bonds and notes4,675 4,049 — — 
Mortgage- and asset-backed and auction rate securities95 66 35 35 
Total available-for-sale debt securities4,797 4,125 35 35 
Equity securities
425 352 — — 
 Time deposit (2)— 30 — — 
Total marketable securities$5,222 $4,507 $35 $35 
(1) Noncurrent marketable securities were included in other assets.
(2) At September 27, 2020, marketable securities also included a time deposit with an original maturity of greater than 90 days.
The contractual maturities of available-for-sale debt securities were as follows (in millions):
December 27,
2020
Years to Maturity
Less than one year$2,810 
One to five years1,892 
No single maturity date130 
Total$4,832 
Debt securities with no single maturity date included mortgage- and asset-backed securities and auction rate securities.