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Loan Receivables (Schedule of Loans That Entered a Modification Program During the Period) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
accounts
Jun. 30, 2014
USD ($)
accounts
Jun. 30, 2015
USD ($)
accounts
Jun. 30, 2014
USD ($)
accounts
Internal Programs [Member] | Credit Card Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts that entered a loan modification program during the period, number of accounts (in accounts) | accounts 11,989 10,648 25,232 23,084
Accounts that entered a loan modification program during the period, balances $ 78 $ 71 $ 164 $ 152
External Programs [Member] | Credit Card Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts that entered a loan modification program during the period, number of accounts (in accounts) | accounts 7,296 7,824 14,913 16,255
Accounts that entered a loan modification program during the period, balances $ 37 $ 42 $ 76 $ 86
Internal And External Loan Modification Programs [Member] | Total Other Loans [Member] | Personal Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts that entered a loan modification program during the period, number of accounts (in accounts) | accounts 989 820 1,975 1,532
Accounts that entered a loan modification program during the period, balances $ 12 $ 10 $ 24 $ 18
Entity Loan Modification Program [Member] | Total Other Loans [Member] | Private Student Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts that entered a loan modification program during the period, number of accounts (in accounts) | accounts 291 345 760 652
Accounts that entered a loan modification program during the period, balances $ 4 $ 5 $ 11 $ 9