Loans and Accounts Receivable (Details 1) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts receivable segment information
Card Member receivables	$ 54,047	$ 47,308
Less: Reserve for losses	521	467	$ 462	$ 465
Card Member receivables, net	53,526	46,841
Other receivables, net	3,163	3,232
Accounts Receivable and Loans Textuals [Abstract]
Other receivables, reserves	31	45
Variable Interest Enterprise [Member]
Accounts receivable segment information
Card Member receivables	8,919	8,874
U S Consumer Services [Member]
Accounts receivable segment information
Card Member receivables	13,143	12,302
International Consumer and Network Services [Member]
Accounts receivable segment information
Card Member receivables	7,803	5,966
Global Commercial Services [Member]
Accounts receivable segment information
Card Member receivables	$ 33,101	$ 29,040