Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Amounts Associated with Processing Services Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interchange fees and assessments	$ 6,592	$ 5,935	$ 12,631	$ 11,222
Debit network fees	$ 819	$ 776	$ 1,564	$ 1,502