Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Taxes (Textual) [Abstract]
Income tax provision	$ 18	$ 11	$ 30	$ 21
Effective tax rate	17.20%	20.30%	17.90%	19.70%
Likelihood of uncertain tax positions			greater than 50%
Tax benefit			50.00%
Unrecognized tax benefits	30		30
Interest accrued for unrecognized tax benefits	$ 1		$ 1