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Fair Value Measurements (Schedule Of Debt Securities Measured At Fair Value On A Recurring Basis, Unobservable Input Reconciliation) (Details) - USD ($)
$ in Millions
9 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of year $ 53 $ 52
Total unrealized gains (losses) included in other comprehensive income (loss) (1) 0
Purchases 17 8
Issuances 0 0
Settlements (20) (12)
Balance at end of period 49 48
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 0 $ 0