Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) - USD ($) $ in Millions	Jul. 03, 2021	Oct. 03, 2020
U.S. treasury and agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost Basis	$ 59	$ 55
Fair Value	59	55
Unrealized Gain (Loss)	0	0
Corporate and asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost Basis	48	51
Fair Value	49	53
Unrealized Gain (Loss)	$ 1	$ 2