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Segment Disclosures (Schedule of Segment Disclosures) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Interest income $ 1,947 $ 1,863 $ 3,876 $ 3,696
Interest expense 311 274 611 544
Net interest income 1,636 1,589 3,265 3,152
Provision for loan losses 306 360 696 632
Other income 539 583 1,081 1,098
Other expense 927 797 1,800 1,581
Income before income tax expense 942 1,015 1,850 2,037
Credit Card Loans [Member]        
Segment Reporting Information [Line Items]        
Interest income 1,620 1,560 3,226 3,097
Provision for loan losses 256 317 593 547
Private Student Loans [Member]        
Segment Reporting Information [Line Items]        
Interest income 92 75 182 148
PCI Student Loans [Member]        
Segment Reporting Information [Line Items]        
Interest income 56 66 116 134
Provision for loan losses 0 0 0 0
Personal Loans [Member]        
Segment Reporting Information [Line Items]        
Interest income 155 138 307 270
Other [Member]        
Segment Reporting Information [Line Items]        
Interest income 24 24 45 47
Operating Segments [Member] | Direct Banking [Member]        
Segment Reporting Information [Line Items]        
Interest income 1,947 1,863 3,876 3,696
Interest expense 311 274 611 544
Net interest income 1,636 1,589 3,265 3,152
Provision for loan losses 306 360 694 630
Other income 468 503 936 939
Other expense 884 748 1,712 1,483
Income before income tax expense 914 984 1,795 1,978
Operating Segments [Member] | Direct Banking [Member] | Credit Card Loans [Member]        
Segment Reporting Information [Line Items]        
Interest income 1,620 1,560 3,226 3,097
Operating Segments [Member] | Direct Banking [Member] | Private Student Loans [Member]        
Segment Reporting Information [Line Items]        
Interest income 92 75 182 148
Operating Segments [Member] | Direct Banking [Member] | PCI Student Loans [Member]        
Segment Reporting Information [Line Items]        
Interest income 56 66 116 134
Operating Segments [Member] | Direct Banking [Member] | Personal Loans [Member]        
Segment Reporting Information [Line Items]        
Interest income 155 138 307 270
Operating Segments [Member] | Direct Banking [Member] | Other [Member]        
Segment Reporting Information [Line Items]        
Interest income 24 24 45 47
Operating Segments [Member] | 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 0 0 2 2
Other income 71 80 145 159
Other expense 43 49 88 98
Income before income tax expense 28 31 55 59
Operating Segments [Member] | Payment Services [Member] | Credit Card Loans [Member]        
Segment Reporting Information [Line Items]        
Interest income 0 0 0 0
Operating Segments [Member] | Payment Services [Member] | Private Student Loans [Member]        
Segment Reporting Information [Line Items]        
Interest income 0 0 0 0
Operating Segments [Member] | Payment Services [Member] | PCI Student Loans [Member]        
Segment Reporting Information [Line Items]        
Interest income 0 0 0 0
Operating Segments [Member] | Payment Services [Member] | Personal Loans [Member]        
Segment Reporting Information [Line Items]        
Interest income 0 0 0 0
Operating Segments [Member] | Payment Services [Member] | Other [Member]        
Segment Reporting Information [Line Items]        
Interest income $ 0 $ 0 $ 0 $ 0