Stockholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 27, 2015	Feb. 17, 2015	Feb. 06, 2015
Equity, Class of Treasury Stock [Line Items]
Common stock, par value	0.0001
Treasury Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Retirement of treasury stock, shares	0	18,250,900	0
Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Quarterly cash dividend per share						$ 0.25
Cash dividend						$ 38
Date to be paid				Feb. 27, 2015
Date of record					Feb. 17, 2015