Stockholders' Equity - Schedule of Shares Repurchase Plans (Details) - 2015 Program - USD ($) $ / shares in Units, shares in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Equity, Class of Treasury Stock [Line Items]
Amount of common stock authorized for repurchase		$ 1,800,000,000.00
Stock repurchased during period (shares)	5.6
Average cost of share acquired (USD per share)	$ 57.88
Shares repurchased during period	$ 325,000,000