Shareholders' Equity - Schedule of Shares Repurchase Plans (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended
	Mar. 31, 2017	Jul. 31, 2016
2016 Program
Equity, Class of Treasury Stock [Line Items]
Amount of common stock authorized for repurchase		$ 1,400,000,000.0
Shares Purchased	6.7
Average Cost per Share (USD per share)	$ 78.34
Total Purchased	$ 523,000,000
Boston Financial Data Services, Inc. and International Financial Data Services
Equity, Class of Treasury Stock [Line Items]
Common stock received in acquisition	$ 158,000,000