Income Taxes (Textuals) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Taxes (Textual) [Abstract]
Income tax provision	$ 22	$ 19	$ 40	$ 49
Effective tax rate	22.90%	17.40%	16.00%	17.60%
Unrecognized tax benefits	$ 27		$ 27
Reduction in unrecognized tax benefits			20
Interest accrued for unrecognized tax benefits	$ 2		$ 2