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Income Taxes (Gross Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 01, 2019
Sep. 02, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Gross unrecognized tax benefit at beginning of year $ 36 $ 52
Gross increases—current year tax positions 5 6
Gross increases—tax positions in prior years 2 6
Gross decreases—tax positions in prior years 0 (17)
Settlements (4) (1)
Lapse of statute of limitations (12) (10)
Gross unrecognized tax benefit at end of year $ 27 $ 36