Subsequent Event (Details) (USD $)			0 Months Ended
	Sep. 06, 2014 3.40% Senior Notes due 2016 [Member] Senior notes [Member]	Dec. 28, 2013 3.40% Senior Notes due 2016 [Member] Senior notes [Member]	Oct. 06, 2014 3.40% Senior Notes due 2016 [Member] Senior notes [Member] Subsequent Event [Member]	Oct. 06, 2014 3.40% Senior Notes due 2016 [Member] Senior notes [Member] Subsequent Event [Member]	Sep. 06, 2014 6.35% Senior Notes due 2017 [Member] Senior notes [Member]	Dec. 28, 2013 6.35% Senior Notes due 2017 [Member] Senior notes [Member]	Oct. 09, 2014 6.35% Senior Notes due 2017 [Member] Senior notes [Member] Subsequent Event [Member]	Sep. 06, 2014 5.00% Senior Notes due 2019 [Member] Senior notes [Member]	Dec. 28, 2013 5.00% Senior Notes due 2019 [Member] Senior notes [Member]	Oct. 14, 2014 5.00% Senior Notes due 2019 [Member] Senior notes [Member] Subsequent Event [Member]	Sep. 06, 2014 3.95% Senior Notes due 2020 [Member] Senior notes [Member]	Dec. 28, 2013 3.95% Senior Notes due 2020 [Member] Senior notes [Member]	Oct. 14, 2014 3.95% Senior Notes due 2020 [Member] Senior notes [Member] Subsequent Event [Member]	Sep. 06, 2014 4.75% Senior Notes due 2021 [Member] Senior notes [Member]	Dec. 28, 2013 4.75% Senior Notes due 2021 [Member] Senior notes [Member]	Oct. 14, 2014 4.75% Senior Notes due 2021 [Member] Senior notes [Member] Subsequent Event [Member]	Sep. 06, 2014 7.45% Senior Debentures due 2027 [Member] Senior Debentures [Member]	Dec. 28, 2013 7.45% Senior Debentures due 2027 [Member] Senior Debentures [Member]	Oct. 14, 2014 7.45% Senior Debentures due 2027 [Member] Senior Debentures [Member] Subsequent Event [Member]	Sep. 06, 2014 7.25% Senior Debentures due 2031 [Member] Senior Debentures [Member]	Dec. 28, 2013 7.25% Senior Debentures due 2031 [Member] Senior Debentures [Member]	Oct. 14, 2014 7.25% Senior Debentures due 2031 [Member] Senior Debentures [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
Principal amount				$ 80,000,000			$ 100,000,000			$ 500,000,000
Fixed interest rate of debt	3.40%	3.40%		3.40%	6.35%	6.35%	6.35%	5.00%	5.00%	5.00%	3.95%	3.95%	3.95%	4.75%	4.75%	4.75%	7.45%	7.45%	7.45%	7.25%	7.25%	7.25%
Repurchase of notes, percent of principal amount			101.00%