Stockholders' Equity Conversion Rights (Details) (USD $)	1 Months Ended	12 Months Ended
	Jul. 31, 2011	Dec. 29, 2012	Dec. 31, 2013 Class A exchangeable shares	Dec. 29, 2012 Class A exchangeable shares votes	Dec. 31, 2013 Class B exchangeable shares votes
Class of Stock [Line Items]
Common stock, votes per share				1	1
Common stock, conversion ratio			1
Stock repurchase program, authorized amount	$ 1,200,000,000
Stock repurchased during period, shares		7,500,000
Stock repurchased during period, value		$ 321,100,000