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Allowance for Loan Losses - Age Analysis of Past Due Loans Delinquencies (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Loans in repayment and percentage of each status:
Loans allowance for losses	$ (1,487)	$ (1,564)	$ (1,519)	$ (1,643)	$ (1,963)	$ (2,033)
FFELP Loans [Member]
Loans in repayment and percentage of each status:
Total loans in repayment	72,058			75,244
Loans allowance for losses	(62)	(78)	$ (70)	$ (89)	$ (91)	$ (93)
Loans, net	92,618	96,498
Credit Concentration Risk [Member] \| Private Education Loans - Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans in-school/grace/deferment	1,489	1,859
Loans in forbearance	792	863
Loans in repayment and percentage of each status:
Loans current	20,225	21,085
Total loans in repayment	21,416	22,558
Total loans, gross	23,697	25,280
Loans unamortized premium (discount)	(431)	(470)
Total loans	23,266	24,810
Loans receivable for partially charged-off loans	541	560
Loans allowance for losses	(1,186)	(1,236)
Loans, net	22,621	24,134
Credit Concentration Risk [Member] \| Private Education Loans - Non-Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans in-school/grace/deferment	147	181
Loans in forbearance	100	110
Loans in repayment and percentage of each status:
Total loans in repayment	1,849	1,944
Total loans, gross	2,096	2,235
Loans unamortized premium (discount)	(58)	(61)
Total loans	2,038	2,174
Loans receivable for partially charged-off loans	306	321
Loans allowance for losses	(224)	(235)
Loans, net	2,120	2,260
Credit Concentration Risk [Member] \| Troubled Debt Restructuring Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans in-school/grace/deferment	609	706
Loans in forbearance	648	695
Loans in repayment and percentage of each status:
Total loans in repayment	9,562	9,241
Total loans, gross	10,819	10,642
Credit Concentration Risk [Member] \| Financing Receivables, Current [Member] \| Private Education Loans - Non-Traditional [Member]
Loans in repayment and percentage of each status:
Loans current	1,618	1,646
Credit Concentration Risk [Member] \| Financing Receivables, Current [Member] \| Troubled Debt Restructuring Loans [Member]
Loans in repayment and percentage of each status:
Loans current	8,424	7,885
Credit Concentration Risk [Member] \| Financing Receivables, 31 to 60 Days Past Due [Member] \| Private Education Loans - Traditional [Member]
Loans in repayment and percentage of each status:
Loans delinquent	401	491
Credit Concentration Risk [Member] \| Financing Receivables, 31 to 60 Days Past Due [Member] \| Private Education Loans - Non-Traditional [Member]
Loans in repayment and percentage of each status:
Loans delinquent	66	86
Credit Concentration Risk [Member] \| Financing Receivables, 31 to 60 Days Past Due [Member] \| Troubled Debt Restructuring Loans [Member]
Loans in repayment and percentage of each status:
Loans delinquent	356	414
Credit Concentration Risk [Member] \| Financing Receivables, 61 to 90 Days Past Due [Member] \| Private Education Loans - Traditional [Member]
Loans in repayment and percentage of each status:
Loans delinquent	242	292
Credit Concentration Risk [Member] \| Financing Receivables, 61 to 90 Days Past Due [Member] \| Private Education Loans - Non-Traditional [Member]
Loans in repayment and percentage of each status:
Loans delinquent	45	56
Credit Concentration Risk [Member] \| Financing Receivables, 61 to 90 Days Past Due [Member] \| Troubled Debt Restructuring Loans [Member]
Loans in repayment and percentage of each status:
Loans delinquent	228	263
Credit Concentration Risk [Member] \| Financing Receivables, 90 Days Past Due [Member] \| Private Education Loans - Traditional [Member]
Loans in repayment and percentage of each status:
Loans delinquent	548	690
Credit Concentration Risk [Member] \| Financing Receivables, 90 Days Past Due [Member] \| Private Education Loans - Non-Traditional [Member]
Loans in repayment and percentage of each status:
Loans delinquent	120	156
Credit Concentration Risk [Member] \| Financing Receivables, 90 Days Past Due [Member] \| Troubled Debt Restructuring Loans [Member]
Loans in repayment and percentage of each status:
Loans delinquent	554	679
Credit Concentration Risk [Member] \| FFELP Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans in-school/grace/deferment	7,149	8,257
Loans in forbearance	12,512	13,298
Loans in repayment and percentage of each status:
Loans current	62,581	62,651
Total loans in repayment	72,058	73,934
Total loans, gross	91,719	95,489
Loans unamortized premium (discount)	961	1,087
Total loans	92,680	96,576
Loans allowance for losses	(62)	(78)
Loans, net	92,618	96,498
Credit Concentration Risk [Member] \| FFELP Loans [Member] \| Financing Receivables, 31 to 60 Days Past Due [Member]
Loans in repayment and percentage of each status:
Loans delinquent	2,668	3,285
Credit Concentration Risk [Member] \| FFELP Loans [Member] \| Financing Receivables, 61 to 90 Days Past Due [Member]
Loans in repayment and percentage of each status:
Loans delinquent	1,605	1,856
Credit Concentration Risk [Member] \| FFELP Loans [Member] \| Financing Receivables, 90 Days Past Due [Member]
Loans in repayment and percentage of each status:
Loans delinquent	$ 5,204	$ 6,142
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Private Education Loans - Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	100.00%	100.00%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Private Education Loans - Non-Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	100.00%	100.00%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Troubled Debt Restructuring Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	100.00%	100.00%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, Current [Member] \| Private Education Loans - Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	94.40%	93.50%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, Current [Member] \| Private Education Loans - Non-Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	87.50%	84.70%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, Current [Member] \| Troubled Debt Restructuring Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	88.10%	85.30%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, 31 to 60 Days Past Due [Member] \| Private Education Loans - Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans delinquent, percentage	1.90%	2.20%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, 31 to 60 Days Past Due [Member] \| Private Education Loans - Non-Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans delinquent, percentage	3.60%	4.40%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, 31 to 60 Days Past Due [Member] \| Troubled Debt Restructuring Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans delinquent, percentage	3.70%	4.50%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, 61 to 90 Days Past Due [Member] \| Private Education Loans - Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans delinquent, percentage	1.10%	1.30%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, 61 to 90 Days Past Due [Member] \| Private Education Loans - Non-Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans delinquent, percentage	2.40%	2.90%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, 61 to 90 Days Past Due [Member] \| Troubled Debt Restructuring Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans delinquent, percentage	2.40%	2.80%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, 90 Days Past Due [Member] \| Private Education Loans - Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans delinquent, percentage	2.60%	3.00%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, 90 Days Past Due [Member] \| Private Education Loans - Non-Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans delinquent, percentage	6.50%	8.00%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, 90 Days Past Due [Member] \| Troubled Debt Restructuring Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans delinquent, percentage	5.80%	7.40%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, Loans In Repayment [Member] \| Private Education Loans - Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	90.40%	89.20%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, Loans In Repayment [Member] \| Private Education Loans - Non-Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	88.20%	87.00%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, Delinquent Loans in Repayment [Member] \| Private Education Loans - Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	5.60%	6.50%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, Delinquent Loans in Repayment [Member] \| Private Education Loans - Non-Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	12.50%	15.30%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, Forbearance, Loans In Repayment [Member] \| Private Education Loans - Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	3.60%	3.70%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| Financing Receivables, Forbearance, Loans In Repayment [Member] \| Private Education Loans - Non-Traditional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	5.10%	5.40%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| FFELP Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	100.00%	100.00%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| FFELP Loans [Member] \| Financing Receivables, Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	86.80%	84.70%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| FFELP Loans [Member] \| Financing Receivables, 31 to 60 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans delinquent, percentage	3.70%	4.50%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| FFELP Loans [Member] \| Financing Receivables, 61 to 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans delinquent, percentage	2.30%	2.50%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| FFELP Loans [Member] \| Financing Receivables, 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans delinquent, percentage	7.20%	8.30%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| FFELP Loans [Member] \| Financing Receivables, Loans In Repayment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	78.60%	77.40%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| FFELP Loans [Member] \| Financing Receivables, Delinquent Loans in Repayment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	13.20%	15.30%
Credit Concentration Risk [Member] \| Accounts Receivable [Member] \| FFELP Loans [Member] \| Financing Receivables, Forbearance, Loans In Repayment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dimensions of concentration risk	14.80%	15.20%