Loans and Accounts Receivable (Details 1) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Accounts receivable segment information
Card Member receivables	$ 45,223	$ 44,133
Less: Reserve for losses	423	462	$ 420	$ 465
Card Member receivables, net	44,800	43,671
Other receivables, net	2,697	3,024
Accounts Receivable and Loans Textuals [Abstract]
Other receivables, reserves	50	43
Variable Interest Enterprise [Member]
Accounts receivable segment information
Card Member receivables	5,828	6,649
Non United States [Member]
Accounts receivable segment information
Card Member receivables	12,700	11,900
U S Consumer Services [Member]
Accounts receivable segment information
Card Member receivables	10,587	11,807
U S Consumer Services [Member] | Variable Interest Enterprise [Member]
Accounts Receivable and Loans Textuals [Abstract]
Gross Card Member receivables available to settle the obligations of a variable interest entity	5,800	6,600
International Consumer and Network Services [Member]
Accounts receivable segment information
Card Member receivables	5,582	5,599
Global Commercial Services [Member]
Accounts receivable segment information
Card Member receivables	$ 29,054	$ 26,727