Income Taxes (Gross Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 30, 2020	Sep. 01, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefit at beginning of year	$ 27	$ 36
Gross increases—current year tax positions	1	5
Gross increases—tax positions in prior years	8	2
Gross decreases—tax positions in prior years	(3)	0
Settlements	0	(4)
Lapse of statute of limitations	(3)	(12)
Gross unrecognized tax benefit at end of year	$ 30	$ 27