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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
3 Months Ended
Dec. 28, 2019
Dec. 29, 2018
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 0
Purchases 3 7
Issuances 0 0
Settlements (6) (6)
Balance at end of period 49 52
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 0 $ 0