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Segment Disclosures (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
Segment Reporting Information [Line Items]        
Interest income $ 1,727 $ 1,646 $ 3,435 $ 3,287
Interest expense 297 332 595 681
Net interest income 1,430 1,314 2,840 2,606
Provision for loan losses 240 262 399 346
Other income 611 552 1,193 1,063
Other expense 820 758 1,573 1,430
Income before income tax expense 981 846 2,061 1,893
Direct Banking [Member]
       
Segment Reporting Information [Line Items]        
Interest income 1,727 1,646 3,435 3,287
Interest expense 297 332 595 681
Net interest income 1,430 1,314 2,840 2,606
Provision for loan losses 225 262 384 346
Other income 531 465 1,026 894
Other expense 734 721 1,447 1,359
Income before income tax expense 1,002 796 2,035 1,795
Payment Services [Member]
       
Segment Reporting Information [Line Items]        
Interest income 0 0 0 0
Interest expense 0 0 0 0
Net interest income 0 0 0 0
Provision for loan losses 15 0 15 0
Other income 80 87 167 169
Other expense 86 37 126 71
Income before income tax expense (21) 50 26 98
Credit Card Receivable [Member]
       
Segment Reporting Information [Line Items]        
Interest income 1,463 1,411 2,914 2,825
Provision for loan losses 193 231 320 290
Credit Card Receivable [Member] | Direct Banking [Member]
       
Segment Reporting Information [Line Items]        
Interest income 1,463 1,411 2,914 2,825
Credit Card Receivable [Member] | Payment Services [Member]
       
Segment Reporting Information [Line Items]        
Interest income 0 0 0 0
Private Student Loans [Member]
       
Segment Reporting Information [Line Items]        
Interest income 61 45 119 88
Private Student Loans [Member] | Direct Banking [Member]
       
Segment Reporting Information [Line Items]        
Interest income 61 45 119 88
Private Student Loans [Member] | Payment Services [Member]
       
Segment Reporting Information [Line Items]        
Interest income 0 0 0 0
PCI Student Loans [Member]
       
Segment Reporting Information [Line Items]        
Interest income 68 76 138 153
PCI Student Loans [Member] | Direct Banking [Member]
       
Segment Reporting Information [Line Items]        
Interest income 68 76 138 153
PCI Student Loans [Member] | Payment Services [Member]
       
Segment Reporting Information [Line Items]        
Interest income 0 0 0 0
Personal Loans [Member]
       
Segment Reporting Information [Line Items]        
Interest income 109 89 212 173
Personal Loans [Member] | Direct Banking [Member]
       
Segment Reporting Information [Line Items]        
Interest income 109 89 212 173
Personal Loans [Member] | Payment Services [Member]
       
Segment Reporting Information [Line Items]        
Interest income 0 0 0 0
Other [Member]
       
Segment Reporting Information [Line Items]        
Interest income 26 25 52 48
Other [Member] | Direct Banking [Member]
       
Segment Reporting Information [Line Items]        
Interest income 26 25 52 48
Other [Member] | Payment Services [Member]
       
Segment Reporting Information [Line Items]        
Interest income $ 0 $ 0 $ 0 $ 0