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Goodwill and Acquired Intangible Assets - Summary of Goodwill, Accumulated Impairments and Net Goodwill for Each Reporting Units and Reportable Segments (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Intangible Assets By Segment [Line Items]    
Gross $ 835 $ 932
Accumulated Impairments (441) (538)
Net 394 394
Consumer Lending [Member]
    
Schedule Of Intangible Assets By Segment [Line Items]    
Gross 147 147
Net 147 147
Business Services [Member]
    
Schedule Of Intangible Assets By Segment [Line Items]    
Gross 494 591
Accumulated Impairments (437) (534)
Net 57 57
Total FFELP Loans Reportable Segment [Member] | FFELP Loans [Member]
    
Schedule Of Intangible Assets By Segment [Line Items]    
Gross 194 194
Accumulated Impairments (4) (4)
Net 190 190
Servicing [Member] | Business Services [Member]
    
Schedule Of Intangible Assets By Segment [Line Items]    
Gross 50 50
Net 50 50
Contingency Services [Member] | Business Services [Member]
    
Schedule Of Intangible Assets By Segment [Line Items]    
Gross 136 136
Accumulated Impairments (129) (129)
Net 7 7
Wind-down Guarantor Servicing [Member] | Business Services [Member]
    
Schedule Of Intangible Assets By Segment [Line Items]    
Gross 256 256
Accumulated Impairments (256) (256)
Insurance Services [Member] | Business Services [Member]
    
Schedule Of Intangible Assets By Segment [Line Items]    
Gross 9 9
Accumulated Impairments (9) (9)
Upromise [Member] | Business Services [Member]
    
Schedule Of Intangible Assets By Segment [Line Items]    
Gross 43 140
Accumulated Impairments $ (43) $ (140)