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Loan Receivables (Changes in the Company's Allowance for Loan Losses) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Allowance For Loan And Lease Losses Writeoffs Net Abstract [Roll Forward]        
Balance at beginning of period $ 1,634 $ 1,971 $ 1,788 $ 2,245
Provision for loan losses 240 262 399 346
Charge-offs (453) (485) (902) (996)
Recoveries 135 150 271 303
Net charge-offs (318) (335) (631) (693)
Balance at end of period 1,556 1,898 1,556 1,898
Credit Card Receivable [Member]
       
Allowance For Loan And Lease Losses Writeoffs Net Abstract [Roll Forward]        
Balance at beginning of period 1,453 1,822 1,613 2,101
Provision for loan losses 193 231 320 290
Charge-offs (417) (463) (839) (953)
Recoveries 131 149 266 301
Net charge-offs (286) (314) (573) (652)
Balance at end of period 1,360 1,739 1,360 1,739
Personal Loans [Member] | Total Other Loans [Member]
       
Allowance For Loan And Lease Losses Writeoffs Net Abstract [Roll Forward]        
Balance at beginning of period 97 91 99 85
Provision for loan losses 20 16 37 39
Charge-offs (22) (18) (42) (36)
Recoveries 3 1 4 2
Net charge-offs (19) (17) (38) (34)
Balance at end of period 98 90 98 90
Student Loans [Member] | Total Other Loans [Member]
       
Allowance For Loan And Lease Losses Writeoffs Net Abstract [Roll Forward]        
Balance at beginning of period 83 58 75 59
Provision for loan losses 12 14 27 16
Charge-offs (14) (4) (21) (7)
Recoveries 1 0 1 0
Net charge-offs (13) (4) (20) (7)
Balance at end of period 82 68 82 68
Other Loans [Member] | Total Other Loans [Member]
       
Allowance For Loan And Lease Losses Writeoffs Net Abstract [Roll Forward]        
Balance at beginning of period 1 0 1 0
Provision for loan losses 15 1 15 1
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Net charge-offs 0 0 0 0
Balance at end of period $ 16 $ 1 $ 16 $ 1