Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Taxes (Textual) [Abstract]
Income tax provision	$ 12	$ 10
Effective tax rate	19.10%	19.10%
Likelihood of uncertain tax positions	greater than 50%
Tax benefit	50.00%
Unrecognized tax benefits	30
Interest accrued for unrecognized tax benefits	$ 1