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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
Jun. 27, 2020
Jun. 29, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of year $ 52 $ 51
Total realized gains (losses) included in earnings 0 0
Total unrealized gains (losses) included in other comprehensive income (loss) 0 1
Purchases 8 12
Issuances 0 0
Settlements (12) (15)
Balance at end of period 48 49
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 0 $ 0