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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Sep. 29, 2018
Income Tax Disclosure [Abstract]          
Effective tax rate for continuing operations 6.00% 25.00% 15.40% (25.30%)  
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent 17.30%   6.40%    
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Percent       50.50%  
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent       1.30%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00% 24.50%  
Unrecognized tax benefits $ 176   $ 176   $ 308