Income Taxes (Geographic Sources) (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Geographic sources of pretax income
United States									$ 1,858	$ 1,640	$ 1,161
Foreign									689	330	77
Income from continuing operations before income tax provision	$ 558	$ 720	$ 619	$ 650	$ 479	$ 602	$ 402	$ 487	$ 2,547	$ 1,970	$ 1,238