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Segment Reporting - Asset Information for Loans Segment (Detail) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Other | $ 4,591 | $ 4,682
Total assets | 125,312 | 134,112
Private Education Loans Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Loans, net | 24,010 | 26,394
Cash and investments | 713 | 596
Other | 1,946 | 1,988
Total assets | 26,669 | 28,978
FFELP Loans Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Loans, net | 90,146 | 96,498
Cash and investments | 3,260 | 3,572
Other | 1,954 | 2,015
Total assets | $ 95,360 | $ 102,085

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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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