Loans and Accounts Receivable (Details 6) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) M	Sep. 30, 2015 USD ($) M	Sep. 30, 2016 USD ($) M	Sep. 30, 2015 USD ($) M
Troubled Debt Restructurings
Financing Receivable, Modifications [Line Items]
Number of Accounts	10,000	13,000	30,000	40,000
Aggregated Outstanding Balance	$ 85	$ 106	$ 257	$ 329
Card Member Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Accounts	8,000	10,000	23,000	31,000
Aggregated Outstanding Balance	$ 56	$ 69	$ 163	$ 218
Average basis point reduction in interest rate by class of Card Member loans	9.00%	9.00%	10.00%	10.00%
Card Member Receivables [Member]
Financing Receivable, Modifications [Line Items]
Number of Accounts	2,000	3,000	7,000	9,000
Aggregated Outstanding Balance	$ 29	$ 37	$ 94	$ 111
Average payment term extension | M	19	12	17	12