Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Amounts Associated with Processing Services Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interchange fees and assessments	$ 6,039	$ 5,287
Debit network fees	$ 745	$ 726