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Segment Reporting - Asset Information for Loans Segment (Detail) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Other | $ 3,992 | $ 4,193
Total assets | 117,890 | 121,136
Private Education Loans Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Loans, net | 22,552 | 23,340
Cash and investments | 697 | 667
Other | 1,428 | 1,567
Total assets | 24,677 | 25,574
FFELP Loans Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Loans, net | 85,284 | 87,730
Cash and investments | 3,265 | 3,212
Other | 1,852 | 1,907
Total assets | $ 90,401 | $ 92,849

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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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