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Segment Reporting - Asset Information for Company's Consumer Lending Business Segment (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Other	$ 7,287	$ 8,273
Total assets	159,543	181,260
Operating Segments [Member] | Consumer Lending [Member]
Segment Reporting Information [Line Items]
Private Education Loans, net	37,512	36,934
Cash and investments	2,555	2,731
Other	2,934	3,275
Total assets	$ 43,001	$ 42,940

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

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Private education loans.

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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

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