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Marketable Securities
 12 Months Ended
Sep. 26, 2021
Investments, Debt and Equity Securities [Abstract]  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure Marketable Securities
Our marketable securities were comprised as follows (in millions):
CurrentNoncurrent (1)
September 26,
2021		September 27,
2020		September 26,
2021		September 27,
2020
Available-for-sale debt securities:    
Corporate bonds and notes$4,459 $4,049 $— $— 
Mortgage- and asset-backed and auction rate securities147 66 — 35 
U.S. Treasury securities and government-related securities10 10 — — 
Total available-for-sale debt securities4,616 4,125 — 35 
Equity securities
682 352 — — 
 Time deposit (2)— 30 — — 
Total marketable securities$5,298 $4,507 $— $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):
September 26,
2021
Years to Maturity:
Less than one year$1,241 
One to five years3,219 
Five to ten years9 
No single maturity date147 
Total$4,616 
Debt securities with no single maturity date included mortgage- and asset-backed securities.