Borrowings Bank facilities to support commercial paper borrowings (Details) (USD $) In Millions, unless otherwise specified	Sep. 28, 2013
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity	$ 6,000
Credit facility, unused capacity	6,000
Facility expiring March 2014
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity	1,500
Credit facility, unused capacity	1,500
Facility expiring February 2015
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity	2,250
Credit facility, unused capacity	2,250
Facility expiring June 2017
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity	2,250
Credit facility, unused capacity	$ 2,250