Capital Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended	12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Aug. 20, 2013 2013 Stock Repurchase Program	Dec. 31, 2013 2013 Stock Repurchase Program	Dec. 31, 2013 2012 Stock Repurchase Program	Dec. 31, 2012 2012 Stock Repurchase Program	Aug. 18, 2012 2012 Stock Repurchase Program	Dec. 31, 2013 Settlement of Employee Tax Withholding Obligations	Dec. 31, 2012 Settlement of Employee Tax Withholding Obligations
Class of Stock [Line Items]
Common Stock, Shares Authorized	750,000,000	750,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Dividends, Per Share, Declared	$ 0.4656	$ 0.4048	$ 0.1012
Stock Repurchase Program, Authorized Amount				$ 250
Treasury Stock, Shares, Acquired	2,304,000	350,000	0		1,700,000	600,000	400,000		200,000	100,000
Treasury Stock, Value, Acquired, Cost Method	73	13			50	17	9		6	4
Stock Repurchase Program, Remaining Authorized Repurchase Amount					$ 200
Stock Repurchase Program, Number of Shares Authorized to be Repurchased						1,000,000		2,000,000