Debt financing (Details Textuals) (USD $)	6 Months Ended
	Dec. 27, 2014	Jun. 28, 2014
Debt Instrument [Line Items]
Receivables Owned by Special Purpose Entity	$ 1,650,000,000	$ 1,650,000,000
Debt Financing [Abstract]
Company's debt, carrying value	2,100,000,000	2,080,000,000
Company's debt, fair value	2,190,000,000	2,190,000,000
Accounts Receivable Securitization Program [Member]
Debt Instrument [Line Items]
Accounts receivable securitization program maximum borrowing amount	900,000,000
Accounts receivable securitization program loan term	2 years
Accounts receivable securitization program, expiration date	August 2016
Program facility fee	0.38%
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	0.38%
2014 Credit Facility
Debt Instrument [Line Items]
Line of credit facility term	5 years
Line of credit facility expiration date	Jul. 01, 2019
2014 Credit Facility | Unsecured Debt [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	1,250,000,000
2014 Credit Facility | Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	150,000,000
Letters of credit outstanding, amount	2,000,000
2012 Credit Facility | Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of credit outstanding, amount		$ 2,000,000