Stock-Based Compensation (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended	0 Months Ended		12 Months Ended		0 Months Ended		12 Months Ended		1 Months Ended
	Dec. 31, 2013	Dec. 28, 2012 Class A common stock	Dec. 01, 2011 Class A common stock	Dec. 31, 2011 Class A common stock	Dec. 31, 2013 Class A common stock	Dec. 28, 2012 Class B common stock	Dec. 01, 2011 Class B common stock	Dec. 31, 2011 Class B common stock	Dec. 31, 2013 Stock options	Jan. 31, 2013 2012 stock option adjustment employee	Jan. 31, 2012 2011 stock option adjustment employee
Share-based compensation
Maximum Expiration term									10 years
Percentage of stock awards vesting per year	20.00%
Shares of common stock available for future grant under stock incentive plans					69.7
Dividend in cash per share (in dollars per share)		$ 1.00	$ 2.00	$ 2.00		$ 1.00	$ 2.00	$ 2.00
Number of stock options subject to an exercise price change in connection with the Stock Option Adjustment (in shares)										16.3	21.2
Number of employees affected by stock option adjustment										550	600
Reduction in exercise price due to dividend declaration (in dollars per share)										$ 0.77	$ 2.00