Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Amounts Associated with Processing Services Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interchange fees and assessments	$ 6,184	$ 5,598	$ 17,406	$ 16,089
PIN-Debit fees	$ 753	$ 757	$ 2,255	$ 2,227