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Pension and Other Postretirement Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Compensation and Retirement Disclosure [Abstract]        
Defined Benefit Plan, Contributions by Employer $ 3 $ 2 $ 12 $ 7
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year     $ 3