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Allowance for Loan Losses - Average Recorded Investment and Interest Income Recognized for TDR (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, Average Recorded Investment	$ 8,181	$ 6,386	$ 2,520
Impaired financing receivable, Interest Income Recognized	530	439	169
Private Education Loans - Traditional [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, Average Recorded Investment	6,805	5,181	1,960
Impaired financing receivable, Interest Income Recognized	418	333	121
Private Education Loans - Non-Traditional [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, Average Recorded Investment	1,376	1,205	560
Impaired financing receivable, Interest Income Recognized	$ 112	$ 106	$ 48

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524

+ Details

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- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

+ Details

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Balance Type:	credit
Period Type:	duration