Accounts Receivable (Distribution Of Credit Card Receivables Across FICO Score Ranges) (Details) $ in Millions	Jan. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit card receivables	$ 2,284
Credit card receivables, % of total	100.00%
801 plus [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit card receivables	$ 369
Credit card receivables, % of total	16.20%
660 - 800 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit card receivables	$ 1,435
Credit card receivables, % of total	62.80%
001 - 659 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit card receivables	$ 392
Credit card receivables, % of total	17.10%
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit card receivables	$ 88	[1]
Credit card receivables, % of total	3.90%	[1]

[1] The FICO score range Other consists of amounts not yet posted to customers’ accounts and receivables from customers for whom FICO scores were temporarily unavailable.