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, 2015	Jun. 28, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of year	$ 67	$ 65
Total realized gains (losses) included in earnings	0	0
Total unrealized gains (losses) included in other comprehensive income (loss)	0	0
Purchases	13	18
Issuances	0	0
Settlements	(19)	(18)
Balance at end of period	61	65
Total gains (losses) for the nine-month period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at end of period	$ 0	$ 0