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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Sep. 29, 2018
Income Tax Disclosure [Abstract]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00%  
Effective tax rate for continuing operations 22.60% (93.80%)  
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Percent   118.10%  
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Percent   2.30%  
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent   1.80%  
Unrecognized tax benefits $ 296   $ 308
Decrease in Unrecognized Tax Benefits is Reasonably Possible $ 13