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Marketable Securities (Tables) | 9 Months Ended
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Jun. 27, 2021
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Our marketable securities were comprised as follows (in millions):
| Current |  | Noncurrent (1)
| June 27, 2021 |  | September 27, 2020 |  | June 27, 2021 |  | September 27, 2020
Available-for-sale debt securities: |  |  |  |  |  |  |
Corporate bonds and notes | $ | 5,035 |  |  | $ | 4,049 |  |  | $ | — |  |  | $ | — |
Mortgage- and asset-backed and auction rate securities | 160 |  |  | 66 |  |  | — |  |  | 35 |
U.S. Treasury securities and government-related securities | 10 |  |  | 10 |  |  | — |  |  | — |
Total available-for-sale debt securities | 5,205 |  |  | 4,125 |  |  | — |  |  | 35 |
Equity securities | 303 |  |  | 352 |  |  | — |  |  | — |
Time deposit (2) | — |  |  | 30 |  |  | — |  |  | — |
Total marketable securities | $ | 5,508 |  |  | $ | 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.
Investments Classified by Contractual Maturity Date | The contractual maturities of available-for-sale debt securities were as follows (in millions):
| June 27, 2021
Years to Maturity |
Less than one year | $ | 1,938 |
One to five years | 3,107 |
No single maturity date | 160 |
Total | $ | 5,205 |

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