Nature of Operations and Significant Accounting Policies (Share Repurchases and Dividend Increase) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended		0 Months Ended
	Apr. 30, 2013	Mar. 28, 2014	Mar. 29, 2013	Apr. 16, 2014 Subsequent Event [Member]
Dividends Payable [Line Items]
Increase in quarterly dividend rate (percent)				7.00%
Quarterly dividends (in US$ per share)				$ 0.16
Share repurchase program	$ 1,000,000,000
Shares Repurchased		$ 127,000,000	$ 0
Shares repurchased during the period (shares)		5