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Segment Reporting - Asset Information for Company's FFELP Loans Business Segment (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
FFELP Loans	$ 104,588	$ 125,612
Other	7,287	8,273
Total assets	159,543	181,260
Operating Segments [Member] | FFELP Loans [Member]
Segment Reporting Information [Line Items]
FFELP Loans	104,588	125,612
Cash and investments	4,473	5,766
Other	3,587	4,286
Total assets	$ 112,648	$ 135,664

X

- Definition

Sum of cash and investments, including restricted cash and investments, as of the balance sheet date.

+ References

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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 issued under the Federal Family Education Loan Program, or "FFELP".

+ References

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.18)

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- Definition

The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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