External financing (Details Textuals) (USD $)	3 Months Ended	6 Months Ended
	Dec. 28, 2013	Dec. 28, 2013	Jun. 29, 2013
External Financing [Abstract]
Company's debt, carrying value	$ 2,200,000,000	$ 2,200,000,000	$ 2,050,000,000
Company's debt, fair value	2,290,000,000	2,290,000,000	2,130,000,000
2012 Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility term		5 years
Line of credit facility, maximum borrowing capacity	1,000,000,000	1,000,000,000
Line of credit facility expiration date	Nov. 18, 2016
Line of credit facility, amount outstanding	25,500,000	25,500,000	6,700,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of credit outstanding, amount	2,000,000	2,000,000	2,300,000
Bank Credit Facilities [Member]
Debt Instrument [Line Items]
Weighted average interest rate on the bank credit facilities	3.90%	3.90%	4.30%
Accounts Receivable Securitization Program [Member]
Debt Instrument [Line Items]
Accounts receivable securitization program maximum borrowing amount	$ 800,000,000	$ 800,000,000
Accounts receivable securitization program loan term	1 year
Accounts receivable securitization program, expiration date	August 2014
Program facility fee	0.35%	0.35%
Base Rate or Commercial Paper [Member] | Accounts Receivable Securitization Program [Member]
Debt Instrument [Line Items]
Terms on which interest on borrowings is calculated	base rate or a commercial paper rate
Interest on borrowings spread		0.35%