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Allowance for Loan Losses - Recorded Investment, Unpaid Principal Balance and Related Allowance for TDR Loans (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDR Loans, Recorded Investment	$ 8,949	$ 7,294
TDR loans, unpaid principal balance	8,986	7,377
TDR Loans, Related Allowance	1,048	1,126
Private Education Loans - Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDR Loans, Recorded Investment	7,515	5,999
TDR loans, unpaid principal balance	7,559	6,074
TDR Loans, Related Allowance	812	844
Private Education Loans - Non-Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDR Loans, Recorded Investment	1,434	1,295
TDR loans, unpaid principal balance	1,427	1,303
TDR Loans, Related Allowance	$ 236	$ 282

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X

- Definition

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 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524

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Balance Type:	debit
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- Definition

Amount of allowance for credit losses related to recorded investment.

+ 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 (a)(3)

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

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- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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 (a)(4)

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

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