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Allowance for Loan Losses - Receivable for Partially Charged-Off Loans (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Net adjustment resulting from the change in the charge-off rate					$ (330)
Net charge-offs remaining					(549)
Total net charge-offs	$ (130)	$ (161)		$ (434)	879
Private Education Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Receivable at beginning of period	847	902		881	1,245
Expected future recoveries of current period defaults	28	38		96	147
Recoveries	(47)	(48)		(149)	(151)
Net adjustment resulting from the change in the charge-off rate			$ (330)		(330)
Net charge-offs remaining					(517)
Total net charge-offs	(112)	(148)		(383)	847
Receivable at end of period	$ 828	$ 892	$ 902	$ 828	892
Private Education Loans [Member] \| Loans Receivable For Partially Charged Off Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Net charge-offs remaining					(19)
Total net charge-offs					$ (349)