Income Taxes (Gross Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 03, 2017	Aug. 28, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefit at beginning of year	$ 52	$ 158
Gross increases—current year tax positions	3	2
Gross increases—tax positions in prior years	17	1
Gross decreases—tax positions in prior years	0	(47)
Settlements	(11)	(25)
Lapse of statute of limitations	(9)	(37)
Gross unrecognized tax benefit at end of year	$ 52	$ 52