Subsequent Event (Narrative) (Details) (USD $) In Millions, unless otherwise specified	May 02, 2015	Jan. 31, 2015	May 03, 2014	May 25, 2015
Subsequent Event [Line Items]
Credit card receivables	$ 2,227	$ 2,284	$ 2,140
Total secured debt	369	368	373
Series 2011-1 Class A Notes, 2.28%, due October 2016 [Member]
Subsequent Event [Line Items]
Total secured debt	325	325	325
Estimate of accounts receivable for potential sale [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Credit card receivables				$ 2,200