Navient (NAVI) 10-Q 1 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	6 Months Ended
	Jun. 30, 2017shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Trading Symbol	NAVI
Entity Registrant Name	NAVIENT CORP
Entity Central Index Key	1,593,538
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	274,104,268

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Investments
Available-for-sale	$ 3	$ 3
Other	312	347
Total investments	315	350
Cash and cash equivalents	1,153	1,253
Restricted cash and investments	3,589	3,600
Goodwill and acquired intangible assets, net	658	670
Other assets	4,276	4,193
Total assets	120,354	121,136
Liabilities
Short-term borrowings	3,918	2,334
Long-term borrowings	110,778	112,368
Other liabilities	2,094	2,711
Total liabilities	116,790	117,413
Commitments and contingencies
Equity
Common stock, par value $0.01 per share, 1.125 billion shares authorized: 439 million and 436 million shares issued, respectively	4	4
Additional paid-in capital	3,056	3,022
Accumulated other comprehensive income (net of tax expense of $3 and $3, respectively)	7	6
Retained earnings	2,997	2,890
Total Navient Corporation stockholders' equity before treasury stock	6,064	5,922
Less: Common stock held in treasury at cost: 165 million and 145 million shares, respectively	(2,524)	(2,223)
Total Navient Corporation stockholders' equity	3,540	3,699
Noncontrolling interest	24	24
Total equity	3,564	3,723
Total liabilities and equity	120,354	121,136
FFELP Loans [Member]
Assets
Loans, net	86,140	87,730
Private Education Loans [Member]
Assets
Loans, net	24,223	23,340
Assets and Liabilities of Consolidated Variable Interest Entities [Member]
Assets
Loans, net	103,316	104,008
Investments
Restricted cash	3,433	3,434
Other assets, Net	611	(11)
Liabilities
Short-term borrowings	1,410	1,078
Long-term borrowings	94,995	95,492
Net assets of consolidated variable interest entities	10,955	10,861
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loans [Member]
Assets
Loans, net	81,651	83,429
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loans [Member]
Assets
Loans, net	21,530	20,500
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Other Loans [Member]
Assets
Loans, net	$ 135	$ 79

Consolidated Balance Sheets (U3

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Allowance for loans losses	$ 1,362	$ 1,433
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,125,000,000	1,125,000,000
Common stock, shares issued	439,187,978	436,037,666
Tax expense for accumulated other comprehensive income	$ 3	$ 3
Common stock held in treasury	165,083,710	145,173,548
FFELP Loans [Member]
Allowance for loans losses	$ 61	$ 67
Private Education Loans [Member]
Allowance for loans losses	$ 1,286	$ 1,351

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income:
Cash and investments	$ 10	$ 6	$ 17	$ 12
Total interest income	1,070	1,028	2,085	2,080
Total interest expense	719	599	1,394	1,165
Net interest income	351	429	691	915
Less: provisions for loan losses	105	110	212	221
Net interest income after provisions for loan losses	246	319	479	694
Other income (loss):
Servicing revenue	70	71	146	154
Asset recovery and business processing revenue	111	101	210	191
Other income (loss)	6	(21)	(1)	(35)
Gains (losses) on derivative and hedging activities, net	(25)	(28)	(41)	(27)
Total other income	162	123	314	283
Expenses:
Salaries and benefits	124	124	253	256
Other operating expenses	106	106	216	222
Total operating expenses	230	230	469	478
Goodwill and acquired intangible asset impairment and amortization expense	6	6	11	10
Total expenses	236	236	480	488
Income before income tax expense	172	206	313	489
Income tax expense	60	81	113	184
Net income	112	125	200	305
Less: net income (loss) attributable to noncontrolling interest	0	0	0	0
Net income attributable to Navient Corporation	$ 112	$ 125	$ 200	$ 305
Basic earnings per common share attributable to Navient Corporation	$ 0.40	$ 0.39	$ 0.70	$ 0.92
Average common shares outstanding	280	322	284	331
Diluted earnings per common share attributable to Navient Corporation	$ 0.39	$ 0.38	$ 0.69	$ 0.91
Average common and common equivalent shares outstanding	285	328	291	335
Dividends per common share attributable to Navient Corporation	$ 0.16	$ 0.16	$ 0.32	$ 0.32
FFELP Loans [Member]
Interest income:
Total interest income	$ 668	$ 618	$ 1,298	$ 1,252
Less: provisions for loan losses	10	10	20	17
Private Education Loans [Member]
Interest income:
Total interest income	386	402	760	813
Less: provisions for loan losses	95	100	190	204
Other Loans [Member]
Interest income:
Total interest income	$ 6	$ 2	$ 10	$ 3

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 112	$ 125	$ 200	$ 305
Other comprehensive income (loss):
Unrealized hedging gains (losses) on derivatives	(24)	(62)	1	(191)
Reclassification adjustments for derivative (gains) losses included in net income (interest expense)	0	0	0	0
Total unrealized gains (losses) on derivatives	(24)	(62)	1	(191)
Income tax benefit	9	23		71
Other comprehensive income (loss), net of tax expense (benefit)	(15)	(39)	1	(120)
Total comprehensive income attributable to Navient Corporation	$ 97	$ 86	$ 201	$ 185

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Common Stock Shares Outstanding [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Total Stockholders' Equity [Member]	Noncontrolling Interest [Member]
Beginning Balance, Value at Dec. 31, 2015	$ 3,933	$ 4	$ (1,425)		$ 2,967	$ (51)	$ 2,414	$ 3,909	$ 24
Beginning Balance, Shares at Dec. 31, 2015		430,561,656	(82,350,868)	348,210,788
Comprehensive income:
Net income (loss)	305						305	305
Other comprehensive income (loss), net of tax	(120)					(120)		(120)
Total comprehensive income	185							185
Cash dividends:
Common stock	(105)						(105)	(105)
Dividend equivalent units related to employee stock-based compensation plans	(3)						(3)	(3)
Issuance of common shares	$ 8				8			8
Issuance of common shares, Shares	2,966,592	2,966,592		2,966,592
Tax impact/benefit of employee stock-based compensation plans	$ (8)				(8)			(8)
Stock-based compensation expense	18				18			18
Common stock repurchased	(375)		$ (375)					(375)
Common stock repurchased, Shares			(32,789,662)	(32,789,662)
Shares repurchased related to employee stock-based compensation plans	$ (16)		$ (16)					(16)
Shares repurchased related to employee stock-based compensation plans, Shares	(1,354,712)		(1,354,712)	(1,354,712)
Ending Balance, Value at Jun. 30, 2016	$ 3,637	$ 4	$ (1,816)		2,985	(171)	2,611	3,613	24
Ending Balance, Shares at Jun. 30, 2016		433,528,248	(116,495,242)	317,033,006
Beginning Balance, Value at Mar. 31, 2016	3,773	$ 4	$ (1,636)		2,975	(132)	2,538	3,749	24
Beginning Balance, Shares at Mar. 31, 2016		433,061,241	(102,547,422)	330,513,819
Comprehensive income:
Net income (loss)	125						125	125
Other comprehensive income (loss), net of tax	(39)					(39)		(39)
Total comprehensive income	86							86
Cash dividends:
Common stock	(51)						(51)	(51)
Dividend equivalent units related to employee stock-based compensation plans	(1)						(1)	(1)
Issuance of common shares	$ 4				4			4
Issuance of common shares, Shares	467,007	467,007		467,007
Tax impact/benefit of employee stock-based compensation plans	$ 1				1			1
Stock-based compensation expense	5				5			5
Common stock repurchased	(175)		$ (175)					(175)
Common stock repurchased, Shares			(13,579,381)	(13,579,381)
Shares repurchased related to employee stock-based compensation plans	$ (5)		$ (5)					(5)
Shares repurchased related to employee stock-based compensation plans, Shares	(368,439)		(368,439)	(368,439)
Ending Balance, Value at Jun. 30, 2016	$ 3,637	$ 4	$ (1,816)		2,985	(171)	2,611	3,613	24
Ending Balance, Shares at Jun. 30, 2016		433,528,248	(116,495,242)	317,033,006
Beginning Balance, Value at Dec. 31, 2016	3,723	$ 4	$ (2,223)		3,022	6	2,890	3,699	24
Beginning Balance, Shares at Dec. 31, 2016		436,037,666	(145,173,548)	290,864,118
Comprehensive income:
Net income (loss)	200						200	200
Other comprehensive income (loss), net of tax	1					1		1
Total comprehensive income	201							201
Cash dividends:
Common stock	(91)						(91)	(91)
Dividend equivalent units related to employee stock-based compensation plans	(2)						(2)	(2)
Issuance of common shares	$ 15				15			15
Issuance of common shares, Shares	3,150,312	3,150,312		3,150,312
Stock-based compensation expense	$ 19				19			19
Common stock repurchased	(275)		$ (275)					(275)
Common stock repurchased, Shares			(18,300,007)	(18,300,007)
Shares repurchased related to employee stock-based compensation plans	$ (26)		$ (26)					(26)
Shares repurchased related to employee stock-based compensation plans, Shares	(1,610,155)		(1,610,155)	(1,610,155)
Ending Balance, Value at Jun. 30, 2017	$ 3,564	$ 4	$ (2,524)		3,056	7	2,997	3,540	24
Ending Balance, Shares at Jun. 30, 2017		439,187,978	(165,083,710)	274,104,268
Beginning Balance, Value at Mar. 31, 2017	3,672	$ 4	$ (2,355)		3,047	22	2,930	3,648	24
Beginning Balance, Shares at Mar. 31, 2017		438,832,176	(153,891,120)	284,941,056
Comprehensive income:
Net income (loss)	112						112	112
Other comprehensive income (loss), net of tax	(15)					(15)		(15)
Total comprehensive income	97							97
Cash dividends:
Common stock	(45)						(45)	(45)
Issuance of common shares	$ 3				3			3
Issuance of common shares, Shares	355,802	355,802		355,802
Stock-based compensation expense	$ 6				6			6
Common stock repurchased	(165)		$ (165)					(165)
Common stock repurchased, Shares			(10,936,715)	(10,936,715)
Shares repurchased related to employee stock-based compensation plans	$ (4)		$ (4)					(4)
Shares repurchased related to employee stock-based compensation plans, Shares	(255,875)		(255,875)	(255,875)
Ending Balance, Value at Jun. 30, 2017	$ 3,564	$ 4	$ (2,524)		$ 3,056	$ 7	$ 2,997	$ 3,540	$ 24
Ending Balance, Shares at Jun. 30, 2017		439,187,978	(165,083,710)	274,104,268

Consolidated Statements of Cha7

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Dividends per common share attributable to Navient Corporation	$ 0.16	$ 0.16	$ 0.32	$ 0.32
Retained Earnings [Member]
Dividends per common share attributable to Navient Corporation	0.16	0.16	0.32	0.32
Total Stockholders' Equity [Member]
Dividends per common share attributable to Navient Corporation	$ 0.16	$ 0.16	$ 0.32	$ 0.32

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net income	$ 200	$ 305
Adjustments to reconcile net income to net cash provided by operating activities:
Goodwill and acquired intangible asset impairment and amortization expense	11	10
Stock-based compensation expense	19	18
Unrealized losses (gains) on derivative and hedging activities	21	(150)
Provisions for loan losses	212	221
(Increase) decrease in restricted cash - other	(5)	1
Decrease in accrued interest receivable	28	50
Increase (decrease) in accrued interest payable	17	(125)
Decrease in other assets	99	417
Increase in other liabilities	23	24
Total net cash provided by operating activities	625	771
Investing activities
Education loans acquired	(5,796)	(2,183)
Reduction of education loans:
Installment payments, claims and other	7,751	7,458
Other investing activities, net	(180)	(51)
Proceeds from maturities of available-for-sale securities		1
Purchases of other securities		(43)
Proceeds from maturities of other securities	15	41
Total net cash provided by investing activities	1,878	5,387
Financing activities
Borrowings collateralized by loans in trust - issued	4,090	3,791
Borrowings collateralized by loans in trust - repaid	(7,190)	(6,603)
Other short-term borrowings repaid	(25)
Other long-term borrowings issued	1,353
Other long-term borrowings repaid	(793)	(1,228)
Other financing activities, net	(39)	147
Common stock repurchased	(275)	(375)
Common stock dividends paid	(91)	(105)
Net cash used in financing activities	(2,603)	(6,375)
Net decrease in cash and cash equivalents	(100)	(217)
Cash and cash equivalents at beginning of period	1,253	1,594
Cash and cash equivalents at end of period	1,153	1,377
Cash disbursements made (refunds received) for:
Interest	1,379	1,088
Income taxes paid	103	87
Income taxes received		(2)
Noncash activity:
Investing activity - Education loans and restricted cash acquired	1,552
Operating activity - Other assets acquired and other liabilities assumed, net	14
Financing activity - Borrowings assumed in acquisition of education loans and restricted cash	1,566
Asset-backed Securities, Securitized Loans and Receivables [Member]
Financing activities
Asset-backed commercial paper conduits, net	367	(2,002)
Assets and Liabilities of Consolidated Variable Interest Entities [Member]
Reduction of education loans:
Decrease in restricted cash - variable interest entities	$ 88	$ 164

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Significant Accounting Policies	1. Significant Accounting Policies Basis of Presentation The accompanying unaudited, consolidated financial statements of Navient have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete consolidated financial statements. The consolidated financial statements include the accounts of Navient and its majority-owned and controlled subsidiaries and those Variable Interest Entities (“VIEs”) for which we are the primary beneficiary, after eliminating the effects of intercompany accounts and transactions. In the opinion of management, all adjustments considered necessary for a fair statement of the results for the interim periods have been included. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Operating results for the three and six months ended June 30, 2017 are not necessarily indicative of the results for the year ending December 31, 2017 or for any other period. These unaudited financial statements should be read in conjunction with the audited financial statements and related notes included in our Annual Report on Form 10-K 10-K”). 10-Q 10-K. Reclassifications Certain reclassifications have been made to the balances as of and for the three and six months ended June 30, 2016 to be consistent with classifications adopted for 2017, and had no effect on net income, total assets, or total liabilities. Education Loan Interest Income and Allowance for Loan Losses In June 2017, Navient purchased education loans with an unpaid principal amount of $6.5 billion comprised of $3.5 billion in FFELP Loans and $3.0 billion in Private Education Loans. Purchased Credit Impaired (“PCI”) Loans Loans acquired with evidence of deterioration of credit quality since origination for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable are PCI loans accounted for under Accounting Standard Codification (“ASC”) 310-30, The Company aggregates loans with common risk characteristics into pools and accounts for each pool as a single asset with a single composite interest rate and an aggregate expectation of cash flows. The pools when formed are initially recorded at fair value. The Company recognizes interest income based on each pool’s effective interest rate which is based on our estimate of all cash flows expected to be received and includes an assumption about prepayment rates. The pools are tested quarterly for impairment by re-estimating Based on the credit attributes discussed above, we concluded that $261 million principal amount of Private Education Loans acquired in June 2017 are required to be accounted for as PCI loans with a fair value of $101 million as of the acquisition date. As of acquisition, this portfolio’s contractually required payments receivable (the total undiscounted amount of all uncollected contractual principal and interest payments both past due and scheduled for the future, adjusted for prepayments) was $411 million with an estimated accretable yield (income expected to be recognized in future periods) of $108 million. There is no valuation allowance recorded as of June 30, 2017. Purchased Non-Credit Impaired Loans Loans acquired that do not have evidence of credit deterioration since origination are recorded at fair value with no allowance for loan losses established at the acquisition date. Loan premiums and discounts are amortized as a part of interest income using the interest method under ASC 310-20, Recently Issued Accounting Pronouncements Revenue Recognition On May 28, 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, We plan to adopt the new standard as of January 1, 2018, the effective date. The new standard permits the use of either the retrospective or cumulative effect transition method. Our implementation efforts to date include the identification of revenue and review of related contracts within the scope of the new standard. We have not yet identified nor do we anticipate material changes in the timing of revenue recognition. However, our review is ongoing as we continue to evaluate both contract revenue and certain contract costs. Classification and Measurement On January 5, 2016, the FASB issued ASU No. 2016-01, Leases On February 25, 2016, the FASB issued ASU No. 2016-02, right-of-use Stock Compensation On March 30, 2016, the FASB issued ASU No. 2016-09, paid-in Allowance for Loan Losses On June 16, 2016, the FASB issued ASU No. 2016-13, Intra-Entity Transfer of Assets On October 24, 2016, the FASB issued ASU No. 2016-16, non-inventory Goodwill Impairment On January 26, 2017, the FASB issued ASU No. 2017-04, two-step

Allowance for Loan Losses

Allowance for Loan Losses	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Allowance for Loan Losses	2. Allowance for Loan Losses Our provisions for loan losses represent the periodic expense of maintaining an allowance sufficient to absorb incurred probable losses, net of expected recoveries, in the held-for-investment Non-Credit We segregate our Private Education Loan portfolio into two classes of loans — traditional and non-traditional. Non-traditional for-profit not-for-profit non-traditional non-traditional. Allowance for Loan Losses Metrics Three Months Ended June 30, 2017 (Dollars in millions) FFELP Loans Private Education Other Total Allowance for Loan Losses Beginning balance $ 64 $ 1,311 $ 16 $ 1,391 Total provision 10 95 — 105 Charge-offs (1) (13 ) (122 ) (1 ) (136 ) Reclassification of interest reserve (2) — 2 — 2 Ending balance $ 61 $ 1,286 $ 15 $ 1,362 Allowance Ending Balance: Individually evaluated for impairment $ — $ 1,153 $ 10 $ 1,163 Collectively evaluated for impairment: Excluding Purchased Non-Credit 61 133 5 199 Purchased Non-Credit (3) — — — — Purchased Credit Impaired Loans (3) — — — — Ending total allowance $ 61 $ 1,286 $ 15 $ 1,362 Loans Ending Balance: Individually evaluated for impairment $ — $ 11,020 $ 31 $ 11,051 Collectively evaluated for impairment: Excluding Purchased Non-Credit 81,984 12,467 174 94,625 Purchased Non-Credit (3) 3,463 2,755 — 6,218 Purchased Credit Impaired Loans (3) — 261 — 261 Ending total loans (4) $ 85,447 $ 26,503 $ 205 $ 112,155 Charge-offs as a percentage of average loans in repayment (annualized) .08 % 2.25 % 2.37 % Allowance coverage of charge-offs (annualized) 1.1 2.6 3.3 Allowance as a percentage of the ending total loan balance (3) .07 % 4.85 % 7.49 % Allowance as a percentage of the ending loans in repayment (3) .09 % 5.45 % 7.49 % Ending total loans (4) $ 85,447 $ 26,503 $ 205 Average loans in repayment $ 68,915 $ 21,621 $ 197 Ending loans in repayment $ 70,095 $ 23,613 $ 205 (1) Charge-offs are reported net of expected recoveries. For Private Education Loans, the expected recovery amount is transferred to the receivable for partially charged-off charged-off Charged-Off (2) Represents the additional allowance related to the amount of uncollectible interest reserved within interest income that is transferred in the period to the allowance for loan losses when interest is capitalized to a loan’s principal balance. (3) See “Note 1 – Significant Accounting Policies – Education Loan Interest Income and Allowance for Loan Losses” for a description of our policy for the $6.5 billion of loans ($3.5 billion of FFELP and $3.0 billion of Private Education) purchased in June 2017 accounted for as either Purchased Credit Impaired Loans or Purchased Non-Credit Non-Credit (4) Ending total loans for Private Education Loans includes the receivable for partially charged-off Three Months Ended June 30, 2016 (Dollars in millions) FFELP Loans Private Education Other Total Allowance for Loan Losses Beginning balance $ 69 $ 1,434 $ 15 $ 1,518 Total provision 10 100 — 110 Charge-offs (1) (13 ) (127 ) — (140 ) Reclassification of interest reserve (2) — 3 — 3 Ending balance $ 66 $ 1,410 $ 15 $ 1,491 Allowance: Ending balance: individually evaluated for impairment $ — $ 1,163 $ 11 $ 1,174 Ending balance: collectively evaluated for impairment 66 247 4 317 Ending total allowance $ 66 $ 1,410 $ 15 $ 1,491 Loans: Ending balance: individually evaluated for impairment (3) $ — $ 11,162 $ 33 $ 11,195 Ending balance: collectively evaluated for impairment (3) 91,625 15,478 47 107,150 Ending total loans (3) $ 91,625 $ 26,640 $ 80 $ 118,345 Charge-offs as a percentage of average loans in repayment (annualized) .07 % 2.17 % 1.32 % Allowance coverage of charge-offs (annualized) 1.2 2.8 13.5 Allowance as a percentage of the ending total loan balance .07 % 5.29 % 18.18 % Allowance as a percentage of the ending loans in repayment .09 % 6.06 % 18.18 % Ending total loans (3) $ 91,625 $ 26,640 $ 80 Average loans in repayment $ 72,980 $ 23,561 $ 82 Ending loans in repayment $ 71,991 $ 23,265 $ 80 (1) Charge-offs are reported net of expected recoveries. For Private Education Loans, the expected recovery amount is transferred to the receivable for partially charged-off charged-off Charged-Off (2) Represents the additional allowance related to the amount of uncollectible interest reserved within interest income that is transferred in the period to the allowance for loan losses when interest is capitalized to a loan’s principal balance. (3) Ending total loans for Private Education Loans includes the receivable for partially charged-off Six Months Ended June 30, 2017 (Dollars in millions) FFELP Loans Private Education Other Total Allowance for Loan Losses Beginning balance $ 67 $ 1,351 $ 15 $ 1,433 Total provision 20 190 2 212 Charge-offs (1) (26 ) (259 ) (2 ) (287 ) Reclassification of interest reserve (2) — 4 — 4 Ending balance $ 61 $ 1,286 $ 15 $ 1,362 Allowance Ending Balance: Individually evaluated for impairment $ — $ 1,153 $ 10 $ 1,163 Collectively evaluated for impairment: Excluding Purchased Non-Credit 61 133 5 199 Purchased Non-Credit (3) — — — — Purchased Credit Impaired Loans (3) — — — — Ending total allowance $ 61 $ 1,286 $ 15 $ 1,362 Loans Ending Balance: Individually evaluated for impairment $ — $ 11,020 $ 31 $ 11,051 Collectively evaluated for impairment: Excluding Purchased Non-Credit 81,984 12,467 174 94,625 Purchased Non-Credit (3) 3,463 2,755 — 6,218 Purchased Credit Impaired Loans (3) — 261 — 261 Ending total loans (4) $ 85,447 $ 26,503 $ 205 $ 112,155 Charge-offs as a percentage of average loans in repayment (annualized) .08 % 2.40 % 2.22 % Allowance coverage of charge-offs (annualized) 1.2 2.5 3.7 Allowance as a percentage of the ending total loan balance (3) .07 % 4.85 % 7.49 % Allowance as a percentage of the ending loans in repayment (3) .09 % 5.45 % 7.49 % Ending total loans (4) $ 85,447 $ 26,503 $ 205 Average loans in repayment $ 69,108 $ 21,706 $ 185 Ending loans in repayment $ 70,095 $ 23,613 $ 205 (1) Charge-offs are reported net of expected recoveries. For Private Education Loans, the expected recovery amount is transferred to the receivable for partially charged-off charged-off Charged-Off (2) Represents the additional allowance related to the amount of uncollectible interest reserved within interest income that is transferred in the period to the allowance for loan losses when interest is capitalized to a loan’s principal balance. (3) See “Note 1 – Significant Accounting Policies – Education Loan Interest Income and Allowance for Loan Losses” for a description of our policy for the $6.5 billion of loans ($3.5 billion of FFELP and $3.0 billion of Private Education) purchased in June 2017 accounted for as either Purchased Credit Impaired Loans or Purchased Non-Credit Non-Credit (4) Ending total loans for Private Education Loans includes the receivable for partially charged-off Six Months Ended June 30, 2016 (Dollars in millions) FFELP Loans Private Education Other Total Allowance for Loan Losses Beginning balance $ 78 $ 1,471 $ 15 $ 1,564 Total provision 17 204 — 221 Charge-offs (1) (29 ) (271 ) — (300 ) Reclassification of interest reserve (2) — 6 — 6 Ending balance $ 66 $ 1,410 $ 15 $ 1,491 Allowance: Ending balance: individually evaluated for impairment $ — $ 1,163 $ 11 $ 1,174 Ending balance: collectively evaluated for impairment 66 247 4 317 Ending total allowance $ 66 $ 1,410 $ 15 $ 1,491 Loans: Ending balance: individually evaluated for impairment (3) $ — $ 11,162 $ 33 $ 11,195 Ending balance: collectively evaluated for impairment (3) 91,625 15,478 47 107,150 Ending total loans (3) $ 91,625 $ 26,640 $ 80 $ 118,345 Charge-offs as a percentage of average loans in repayment (annualized) .08 % 2.28 % 1.69 % Allowance coverage of charge-offs (annualized) 1.1 2.6 10.4 Allowance as a percentage of the ending total loan balance .07 % 5.29 % 18.18 % Allowance as a percentage of the ending loans in repayment .09 % 6.06 % 18.18 % Ending total loans (3) $ 91,625 $ 26,640 $ 80 Average loans in repayment $ 73,339 $ 23,871 $ 83 Ending loans in repayment $ 71,991 $ 23,265 $ 80 (1) Charge-offs are reported net of expected recoveries. For Private Education Loans, the expected recovery amount is transferred to the receivable for partially charged-off charged-off Charged-Off (2) Represents the additional allowance related to the amount of uncollectible interest reserved within interest income that is transferred in the period to the allowance for loan losses when interest is capitalized to a loan’s principal balance. (3) Ending total loans for Private Education Loans includes the receivable for partially charged-off Key Credit Quality Indicators FFELP Loans are substantially insured and guaranteed as to their principal and accrued interest in the event of default; therefore, the key credit quality indicator for this portfolio is loan status. The impact of changes in loan status is incorporated quarterly into the allowance for loan losses calculation. For Private Education Loans, the key credit quality indicators are school type, FICO scores, the existence of a cosigner, the loan status and loan seasoning. The school type/FICO score are assessed at origination and maintained through the traditional/non-traditional charged-off Private Education Loans June 30, 2017 December 31, 2016 (Dollars in millions) Balance (3) % of Balance Balance (3) % of Balance Credit Quality Indicators School Type/FICO Scores: Traditional $ 23,583 92 % $ 22,367 92 % Non-Traditional (1) 2,136 8 1,966 8 Total $ 25,719 100 % $ 24,333 100 % Cosigners: With cosigner $ 16,714 65 % $ 15,610 64 % Without cosigner 9,005 35 8,723 36 Total $ 25,719 100 % $ 24,333 100 % Seasoning (2) : 1-12 $ 1,402 5 % $ 1,340 5 % 13-24 1,152 5 1,271 5 25-36 1,723 7 1,908 8 37-48 2,673 10 2,723 11 More than 48 payments 17,533 68 15,698 65 Not yet in repayment 1,236 5 1,393 6 Total $ 25,719 100 % $ 24,333 100 % (1) Defined as loans to customers attending for-profit not-for-profit (2) Number of months in active repayment for which a scheduled payment was received. (3) Balance represents gross Private Education Loans. The following tables provide information regarding the loan status and aging of past due loans. FFELP Loan Delinquencies June 30, December 31, (Dollars in millions) Balance % Balance % Loans in-school/grace/deferment (1) $ 5,538 $ 5,871 Loans in forbearance (2) 9,814 10,490 Loans in repayment and percentage of each status: Loans current 61,108 87.2 % 61,977 87.8 % Loans delinquent 31-60 (3) 3,187 4.5 2,820 4.0 Loans delinquent 61-90 (3) 1,596 2.3 1,325 1.9 Loans delinquent greater than 90 days (3) 4,204 6.0 4,435 6.3 Total FFELP Loans in repayment 70,095 100 % 70,557 100 % Total FFELP Loans, gross 85,447 86,918 FFELP Loan unamortized premium 754 879 Total FFELP Loans 86,201 87,797 FFELP Loan allowance for losses (61 ) (67 ) FFELP Loans, net $ 86,140 $ 87,730 Percentage of FFELP Loans in repayment 82.0 % 81.2 % Delinquencies as a percentage of FFELP Loans in repayment 12.8 % 12.2 % FFELP Loans in forbearance as a percentage of loans in repayment and forbearance 12.3 % 12.9 % (1) Loans for customers who may still be attending school or engaging in other permitted educational activities and are not yet required to make payments on their loans, e.g., residency periods for medical students or a grace period for bar exam preparation, as well as loans for customers who have requested and qualify for other permitted program deferments such as military, unemployment, or economic hardships. (2) Loans for customers who have used their allowable deferment time or do not qualify for deferment, that need additional time to obtain employment or who have temporarily ceased making full payments due to hardship or other factors. (3) The period of delinquency is based on the number of days scheduled payments are contractually past due. Traditional Private Education Loan June 30, December 31, (Dollars in millions) Balance % Balance % Loans in-school/grace/deferment (1) $ 1,122 $ 1,271 Loans in forbearance (2) 771 700 Loans in repayment and percentage of each status: Loans current 20,496 94.5 % 19,020 93.3 % Loans delinquent 31-60 (3) 413 1.9 444 2.2 Loans delinquent 61-90 (3) 240 1.1 269 1.3 Loans delinquent greater than 90 days (3) 541 2.5 663 3.2 Total traditional loans in repayment 21,690 100 % 20,396 100 % Total traditional loans, gross 23,583 22,367 Traditional loans unamortized discount (884 ) (402 ) Total traditional loans 22,699 21,965 Traditional loans receivable for partially charged-off 509 526 Traditional loans allowance for losses (1,083 ) (1,138 ) Traditional loans, net $ 22,125 $ 21,353 Percentage of traditional loans in repayment 92.0 % 91.2 % Delinquencies as a percentage of traditional loans in repayment 5.5 % 6.7 % Loans in forbearance as a percentage of loans in repayment and forbearance 3.4 % 3.3 % (1) Deferment includes customers who have returned to school or are engaged in other permitted educational activities and are not yet required to make payments on their loans, e.g., residency periods for medical students or a grace period for bar exam preparation. (2) Loans for customers who have requested extension of grace period generally during employment transition or who have temporarily ceased making full payments due to hardship or other factors, consistent with established loan program servicing policies and procedures. (3) The period of delinquency is based on the number of days scheduled payments are contractually past due. Non-Traditional Private Education Loan June 30, December 31, (Dollars in millions) Balance % Balance % Loans in-school/grace/deferment (1) $ 114 $ 122 Loans in forbearance (2) 99 90 Loans in repayment and percentage of each status: Loans current 1,691 87.9 % 1,486 84.8 % Loans delinquent 31-60 (3) 68 3.6 78 4.5 Loans delinquent 61-90 (3) 47 2.4 52 2.9 Loans delinquent greater than 90 days (3) 117 6.1 138 7.8 Total non-traditional 1,923 100 % 1,754 100 % Total non-traditional 2,136 1,966 Non-traditional (110 ) (55 ) Total non-traditional 2,026 1,911 Non-traditional charged-off 275 289 Non-traditional (203 ) (213 ) Non-traditional $ 2,098 $ 1,987 Percentage of non-traditional 90.0 % 89.2 % Delinquencies as a percentage of non-traditional 12.1 % 15.2 % Loans in forbearance as a percentage of loans in repayment and forbearance 4.9 % 4.9 % (1) Deferment includes customers who have returned to school or are engaged in other permitted educational activities and are not yet required to make payments on their loans, e.g., residency periods for medical students or a grace period for bar exam preparation. (2) Loans for customers who have requested extension of grace period generally during employment transition or who have temporarily ceased making full payments due to hardship or other factors, consistent with established loan program servicing policies and procedures. (3) The period of delinquency is based on the number of days scheduled payments are contractually past due. Receivable for Partially Charged-Off At the end of each month, for loans that are 212 or more days past due, we charge off the estimated loss of a defaulted loan balance. Actual recoveries are applied against the remaining loan balance that was not charged off. We refer to this remaining loan balance as the “receivable for partially charged-off charged-off The following table summarizes the activity in the receivable for partially charged-off Three Months Ended Six Months Ended (Dollars in millions) 2017 2016 2017 2016 Receivable at beginning of period $ 800 $ 867 $ 815 $ 881 Expected future recoveries of current period defaults (1) 29 32 63 68 Recoveries (2) (40 ) (49 ) (84 ) (95 ) Charge-offs (3) (5 ) (3 ) (10 ) (7 ) Receivable at end of period $ 784 $ 847 $ 784 $ 847 (1) Represents our estimate of the amount to be collected in the future. (2) Current period cash collections. (3) Represents the current period recovery shortfall — the difference between what was expected to be collected and what was actually collected. These amounts are included in total charge-offs as reported in the “Allowance for Private Education Loan Losses” table. Troubled Debt Restructurings (“TDRs”) We sometimes modify the terms of loans for certain customers when we believe such modifications may increase the ability and willingness of a customer to make payments and thus increase the ultimate overall amount collected on a loan. These modifications generally take the form of a forbearance, a temporary interest rate reduction or an extended repayment plan. For customers experiencing financial difficulty, certain Private Education Loans for which we have granted either a forbearance of greater than three months, an interest rate reduction or an extended repayment plan are classified as TDRs. Approximately 59 percent and 61 percent of the loans granted forbearance have qualified as a TDR loan at June 30, 2017 and December 31, 2016, respectively. The unpaid principal balance of TDR loans that were in an interest rate reduction plan as of June 30, 2017 and December 31, 2016 was $2.6 billion and $2.6 billion, respectively. At June 30, 2017 and December 31, 2016, all of our TDR loans had a related allowance recorded. The following table provides the recorded investment, unpaid principal balance and related allowance for our TDR loans. TDR Loans (Dollars in millions) Recorded (1) Unpaid Related June 30, 2017 Private Education Loans — Traditional $ 9,277 $ 9,322 $ 973 Private Education Loans — Non-Traditional 1,317 1,323 180 Total $ 10,594 $ 10,645 $ 1,153 December 31, 2016 Private Education Loans — Traditional $ 9,386 $ 9,429 $ 1,003 Private Education Loans — Non-Traditional 1,373 1,376 187 Total $ 10,759 $ 10,805 $ 1,190 (1) The recorded investment is equal to the unpaid principal balance and accrued interest receivable net of unamortized deferred fees and costs. The following tables provide the average recorded investment and interest income recognized for our TDR loans. Three Months Ended June 30, 2017 2016 (Dollars in millions) Average Interest Average Interest Private Education Loans — Traditional $ 9,307 $ 149 $ 9,320 $ 138 Private Education Loans — Non-Traditional 1,333 27 1,418 27 Total $ 10,640 $ 176 $ 10,738 $ 165 Six Months Ended June 30, 2017 2016 (Dollars in millions) Average Interest Average Interest Private Education Loans — Traditional $ 9,337 $ 295 $ 9,271 $ 276 Private Education Loans — Non-Traditional 1,346 53 1,425 54 Total $ 10,683 $ 348 $ 10,696 $ 330 The following table provides information regarding the loan status and aging of TDR loans that are past due. TDR Loan Delinquencies June 30, 2017 December 31, 2016 (Dollars in millions) Balance % Balance % Loans in deferment (1) $ 509 $ 579 Loans in forbearance (2) 624 588 Loans in repayment and percentage of each status: Loans current 8,367 88.0 % 8,273 85.8 % Loans delinquent 31-60 (3) 355 3.7 412 4.3 Loans delinquent 61-90 (3) 223 2.3 267 2.8 Loans delinquent greater than 90 days (3) 567 6.0 686 7.1 Total TDR loans in repayment 9,512 100 % 9,638 100 % Total TDR loans, gross $ 10,645 $ 10,805 (1) Deferment includes customers who have returned to school or are engaged in other permitted educational activities and are not yet required to make payments on their loans, e.g., residency periods for medical students or a grace period for bar exam preparation. (2) Loans for customers who have requested extension of grace period generally during employment transition or who have temporarily ceased making full payments due to hardship or other factors, consistent with established loan program servicing policies and procedures. (3) The period of delinquency is based on the number of days scheduled payments are contractually past due. The following table provides the amount of loans modified in the periods presented that resulted in a TDR. Additionally, the table summarizes charge-offs occurring in the TDR portfolio, as well as TDRs for which a payment default occurred in the current period within 12 months of the loan first being designated as a TDR. We define payment default as 60 days past due for this disclosure. Three Months Ended June 30, 2017 2016 (Dollars in millions) Modified (1) Charge- (2) Payment Modified (1) Charge- (2) Payment Private Education Loans — Traditional $ 189 $ 74 $ 41 $ 286 $ 74 $ 56 Private Education Loans — Non-Traditional 14 20 6 25 20 10 Total $ 203 $ 94 $ 47 $ 311 $ 94 $ 66 Six Months Ended June 30, 2017 2016 (Dollars in millions) Modified (1) Charge- (2) Payment Modified (1) Charge- (2) Payment Private Education Loans — Traditional $ 388 $ 160 $ 88 $ 628 $ 154 $ 118 Private Education Loans — Non-Traditional 30 40 13 52 42 21 Total $ 418 $ 200 $ 101 $ 680 $ 196 $ 139 (1) Represents period ending balance of loans that have been modified during the period and resulted in a TDR. (2) Represents loans that charged off that were classified as TDRs. Accrued Interest Receivable The following table provides information regarding accrued interest receivable on our Private Education Loans. (Dollars in millions) Accrued Greater Than Allowance for June 30, 2017 Private Education Loans — Traditional $ 341 $ 20 $ 20 Private Education Loans — Non-Traditional 49 6 6 Total $ 390 $ 26 $ 26 December 31, 2016 Private Education Loans — Traditional $ 344 $ 26 $ 23 Private Education Loans — Non-Traditional 47 7 7 Total $ 391 $ 33 $ 30

Borrowings

Borrowings	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Borrowings	3. Borrowings The following table summarizes our borrowings. June 30, 2017 December 31, 2016 (Dollars in millions) Short Long Total Short Long Total Unsecured borrowings: Senior unsecured debt $ 1,937 $ 12,358 $ 14,295 $ 717 $ 13,029 $ 13,746 Total unsecured borrowings 1,937 12,358 14,295 717 13,029 13,746 Secured borrowings: FFELP Loan securitizations — 73,025 73,025 — 73,522 73,522 Private Education Loan securitizations (1) 685 13,000 13,685 548 14,125 14,673 FFELP Loan — other facilities — 10,729 10,729 — 12,443 12,443 Private Education Loan — other facilities 613 1,879 2,492 464 — 464 Other (2) 632 — 632 606 — 606 Total secured borrowings 1,930 98,633 100,563 1,618 100,090 101,708 Total before hedge accounting adjustments 3,867 110,991 114,858 2,335 113,119 115,454 Hedge accounting adjustments 51 (213 ) (162 ) (1 ) (751 ) (752 ) Total $ 3,918 $ 110,778 $ 114,696 $ 2,334 $ 112,368 $ 114,702 (1) Includes $685 million and $548 million of short-term debt related to the Private Education Loan asset-backed securitization repurchase facilities (“Repurchase Facilities”) as of June 30, 2017 and December 31, 2016, respectively. Includes $957 million and $475 million of long-term debt related to the Repurchase Facilities as of June 30, 2017 and December 31, 2016, respectively. (2) “Other” primarily includes the obligation to return cash collateral held related to derivative exposures, which includes $139 million and $193 million of securities re-pledged Variable Interest Entities We consolidated the following financing VIEs as of June 30, 2017 and December 31, 2016, as we are the primary beneficiary. As a result, these VIEs are accounted for as secured borrowings. June 30, 2017 Debt Outstanding Carrying Amount of Assets Securing (Dollars in millions) Short Long Total Loans Cash Other Total Secured Borrowings — VIEs: FFELP Loan securitizations $ — $ 73,025 $ 73,025 $ 73,795 $ 2,659 $ 868 $ 77,322 Private Education Loan securitizations (1) 685 13,000 13,685 18,275 500 232 19,007 FFELP Loan — other facilities — 7,689 7,689 7,856 210 163 8,229 Private Education Loan — other facilities 613 1,879 2,492 3,255 58 45 3,358 Other 112 — 112 135 6 — 141 Total before hedge accounting adjustments 1,410 95,593 97,003 103,316 3,433 1,308 108,057 Hedge accounting adjustments — (598 ) (598 ) — — (697 ) (697 ) Total $ 1,410 $ 94,995 $ 96,405 $ 103,316 $ 3,433 $ 611 $ 107,360 December 31, 2016 Debt Outstanding Carrying Amount of Assets Securing (Dollars in millions) Short Long Total Loans Cash Other Total Secured Borrowings — VIEs: FFELP Loan securitizations $ — $ 73,522 $ 73,522 $ 74,197 $ 2,676 $ 778 $ 77,651 Private Education Loan securitizations (1) 548 14,125 14,673 19,815 455 260 20,530 FFELP Loan — other facilities — 9,046 9,046 9,232 289 172 9,693 Private Education Loan — other facilities 464 — 464 685 10 14 709 Other 66 — 66 79 4 — 83 Total before hedge accounting adjustments 1,078 96,693 97,771 104,008 3,434 1,224 108,666 Hedge accounting adjustments — (1,201 ) (1,201 ) — — (1,235 ) (1,235 ) Total $ 1,078 $ 95,492 $ 96,570 $ 104,008 $ 3,434 $ (11 ) $ 107,431 (1) Includes $687 million of short-term debt, $964 million of long-term debt and $52 million of restricted cash related to the Repurchase Facilities as of June 30, 2017. Includes $548 million of short-term debt, $475 million of long-term debt and $49 million of restricted cash related to the Repurchase Facilities as of December 31, 2016.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	4. Derivative Financial Instruments Our risk management strategy and use of and accounting for derivatives have not materially changed from that discussed in our 2016 Form 10-K. 10-K Summary of Derivative Financial Statement Impact The following tables summarize the fair values and notional amounts of all derivative instruments at June 30, 2017 and December 31, 2016, and their impact on other comprehensive income and earnings for the three and six months ended June 30, 2017 and 2016. Impact of Derivatives on Consolidated Balance Sheet Cash Flow Fair Value Trading Total (Dollars in millions) Hedged Risk Jun. 30, Dec. 31, Jun. 30, Dec. 31, Jun. 30, Dec. 31, Jun. 30, Dec. 31, Fair Values (1) Derivative Assets: Interest rate swaps Interest rate $ 47 $ 78 $ 396 $ 465 $ 10 $ 22 $ 453 $ 565 Cross-currency interest rate swaps Foreign currency — — 20 — — — 20 — Other (2) Interest rate — — — — — — — — Total derivative assets (3) 47 78 416 465 10 22 473 565 Derivative Liabilities: Interest rate swaps Interest rate (57 ) (76 ) (60 ) (62 ) (74 ) (70 ) (191 ) (208 ) Floor Income Contracts Interest rate — — — — (158 ) (184 ) (158 ) (184 ) Cross-currency interest rate swaps Foreign currency — — (686 ) (1,243 ) (44 ) (53 ) (730 ) (1,296 ) Other (2) Interest rate — — — — (22 ) (13 ) (22 ) (13 ) Total derivative (3) (57 ) (76 ) (746 ) (1,305 ) (298 ) (320 ) (1,101 ) (1,701 ) Net total derivatives $ (10 ) $ 2 $ (330 ) $ (840 ) $ (288 ) $ (298 ) $ (628 ) $ (1,136 ) (1) Fair values reported are exclusive of collateral held and pledged and accrued interest. Assets and liabilities are presented without consideration of master netting agreements. Derivatives are carried on the balance sheet based on net position by counterparty under master netting agreements, and classified in other assets or other liabilities depending on whether in a net positive or negative position. (2) “Other” includes embedded derivatives bifurcated from securitization debt as well as derivatives related to our Total Return Swap Facility. (3) The following table reconciles gross positions without the impact of master netting agreements to the balance sheet classification: Other Assets Other Liabilities (Dollar in millions) June 30, December 31, June 30, December 31, Gross position $ 473 $ 565 $ (1,101 ) $ (1,701 ) Impact of master netting agreements (41 ) (31 ) 41 31 Derivative values with impact of master netting agreements (as carried on balance sheet) 432 534 (1,060 ) (1,670 ) Cash collateral (held) pledged (379 ) (345 ) 283 319 Net position $ 53 $ 189 $ (777 ) $ (1,351 ) The above fair values include adjustments when necessary for counterparty credit risk for both when we are exposed to the counterparty, net of collateral postings, and when the counterparty is exposed to us, net of collateral postings. The net adjustments decreased the asset position at June 30, 2017 and December 31, 2016 by $4 million and $0, respectively. In addition, the above fair values reflect adjustments for illiquid derivatives as indicated by a wide bid/ask spread in the interest rate indices to which the derivatives are indexed. These adjustments decreased the overall net asset positions at June 30, 2017 and December 31, 2016 by $36 million and $31 million, respectively. Cash Flow Fair Value Trading Total (Dollars in billions) Jun. 30, Dec. 31, Jun. 30, Dec. 31, Jun. 30, Dec. 31, Jun. 30, Dec. 31, Notional Values: Interest rate swaps $ 20.0 $ 15.2 $ 12.8 $ 11.8 $ 47.3 $ 23.8 $ 80.1 $ 50.8 Floor Income Contracts — — — — 21.9 18.5 21.9 18.5 Cross-currency interest rate swaps — — 7.4 8.5 .3 .3 7.7 8.8 Other (1) — — — — 2.3 2.6 2.3 2.6 Total derivatives $ 20.0 $ 15.2 $ 20.2 $ 20.3 $ 71.8 $ 45.2 $ 112.0 $ 80.7 (1) “Other” includes embedded derivatives bifurcated from securitization debt as well as derivatives related to our Total Return Swap Facility. Impact of Derivatives on Consolidated Statements of Income Three Months Ended June 30, Unrealized Gain (1)(2) Realized Gain (3) Unrealized Gain (1) Total Gain (Loss) (Dollars in millions) 2017 2016 2017 2016 2017 2016 2017 2016 Fair Value Hedges: Interest rate swaps $ 18 $ 71 $ 46 $ 68 $ (38 ) $ (68 ) $ 26 $ 71 Cross-currency interest rate swaps 459 (275 ) (29 ) (20 ) (442 ) 252 (12 ) (43 ) Total fair value derivatives 477 (204 ) 17 48 (480 ) 184 14 28 Cash Flow Hedges: Interest rate swaps — — (14 ) (11 ) — — (14 ) (11 ) Total cash flow derivatives — — (14 ) (11 ) — — (14 ) (11 ) Trading: Interest rate swaps (8 ) 11 5 11 — — (3 ) 22 Floor Income Contracts 13 7 (18 ) (56 ) — — (5 ) (49 ) Cross-currency interest rate swaps (4 ) 25 (2 ) (1 ) — — (6 ) 24 Other (6 ) (4 ) (2 ) (1 ) — — (8 ) (5 ) Total trading derivatives (5 ) 39 (17 ) (47 ) — — (22 ) (8 ) Total 472 (165 ) (14 ) (10 ) (480 ) 184 (22 ) 9 Less: realized gains (losses) recorded in interest expense — — 3 37 — — 3 37 Gains (losses) on derivative and hedging activities, net $ 472 $ (165 ) $ (17 ) $ (47 ) $ (480 ) $ 184 $ (25 ) $ (28 ) (1) Recorded in “Gains (losses) on derivative and hedging activities, net” in the consolidated statements of income. (2) Represents ineffectiveness related to cash flow hedges. (3) For fair value and cash flow hedges, recorded in interest expense. For trading derivatives, recorded in “Gains (losses) on derivative and hedging activities, net.” Six Months Ended June 30, Unrealized Gain (1)(2) Realized Gain (3) Unrealized Gain (1) Total Gain (Loss) (Dollars in millions) 2017 2016 2017 2016 2017 2016 2017 2016 Fair Value Hedges: Interest rate swaps $ (66 ) $ 315 $ 100 $ 139 $ 23 $ (347 ) $ 57 $ 107 Cross-currency interest rate swaps 577 99 (58 ) (36 ) (604 ) (54 ) (85 ) 9 Total fair value derivatives 511 414 42 103 (581 ) (401 ) (28 ) 116 Cash Flow Hedges: Interest rate swaps — — (30 ) (11 ) — — (30 ) (11 ) Total cash flow derivatives — — (30 ) (11 ) — — (30 ) (11 ) Trading: Interest rate swaps (15 ) 63 25 20 — — 10 83 Floor Income Contracts 66 34 (38 ) (194 ) — — 28 (160 ) Cross-currency interest rate swaps 8 45 (3 ) (2 ) — — 5 43 Other (10 ) (5 ) (4 ) (1 ) — — (14 ) (6 ) Total trading derivatives 49 137 (20 ) (177 ) — — 29 (40 ) Total 560 551 (8 ) (85 ) (581 ) (401 ) (29 ) 65 Less: realized gains (losses) recorded in interest expense — — 12 92 — — 12 92 Gains (losses) on derivative and hedging activities, net $ 560 $ 551 $ (20 ) $ (177 ) $ (581 ) $ (401 ) $ (41 ) $ (27 ) (1) Recorded in “Gains (losses) on derivative and hedging activities, net” in the consolidated statements of income. (2) Represents ineffectiveness related to cash flow hedges. (3) For fair value and cash flow hedges, recorded in interest expense. For trading derivatives, recorded in “Gains (losses) on derivative and hedging activities, net.” Collateral Collateral held and pledged related to derivative exposures between us and our derivative counterparties are detailed in the following table: (Dollars in millions) June 30, December 31, Collateral held: Cash (obligation to return cash collateral is recorded in short-term borrowings) $ 379 $ 345 Securities at fair value — corporate derivatives (not recorded in financial statements) (1) 136 193 Securities at fair value — on-balance (2) 243 230 Total collateral held $ 758 $ 768 Derivative asset at fair value including accrued interest $ 610 $ 689 Collateral pledged to others: Cash (right to receive return of cash collateral is recorded in investments) $ 283 $ 319 Total collateral pledged $ 283 $ 319 Derivative liability at fair value including accrued interest and premium receivable $ 1,039 $ 1,670 (1) The Company has the ability to sell or re-pledge (2) The trusts do not have the ability to sell or re-pledge Our corporate derivatives contain credit contingent features. At our current unsecured credit rating, we have fully collateralized our corporate derivative liability position (including accrued interest and net of premiums receivable) of $305 million with our counterparties. Downgrades in our unsecured credit rating would not result in any additional collateral requirements, except to increase the frequency of collateral calls. Trust related derivatives do not contain credit contingent features related to our or the trusts’ credit ratings.

Other Assets

Other Assets	6 Months Ended
	Jun. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	5. Other Assets The following table provides the detail of our other assets. (Dollars in millions) June 30, December 31, Accrued interest receivable, net $ 1,821 $ 1,663 Income tax asset, net current and deferred 715 725 Benefit and insurance-related investments 495 488 Derivatives at fair value 432 534 Other loans, net 189 148 Fixed assets, net 152 160 Accounts receivable 109 95 Other 363 380 Total $ 4,276 $ 4,193

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Stockholders' Equity	6. Stockholders’ Equity The following table summarizes common share repurchases and issuances. Three Months Ended Six Months Ended 2017 2016 2017 2016 Common shares repurchased (1) 10,936,715 13,579,381 18,300,007 32,789,662 Average purchase price per share $ 15.10 $ 12.90 $ 15.04 $ 11.45 Shares repurchased related to employee stock-based compensation plans (2) 255,875 368,439 1,610,155 1,354,712 Average purchase price per share $ 15.70 $ 13.05 $ 15.58 $ 10.80 Common shares issued (3) 355,802 467,007 3,150,312 2,966,592 (1) Common shares purchased under our share repurchase programs. (2) Comprises shares withheld from stock option exercises and vesting of restricted stock for employees’ tax withholding obligations and shares tendered by employees to satisfy option exercise costs. (3) Common shares issued under our various compensation and benefit plans. The closing price of our common stock on June 30, 2017 was $16.65. Dividend and Share Repurchase Program In June 2017 and March 2017, we paid a common stock dividend of $0.16 per share. We repurchased 10.9 million shares of common stock for $165 million in the six months ended June 30, 2017. The shares were repurchased under our previously disclosed share repurchase program. As of June 30, 2017, the remaining repurchase authority was $325 million. In the six months ended June 30, 2016, we repurchased 32.8 million shares for $375 million.

Earnings per Common Share

Earnings per Common Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings per Common Share	7. Earnings per Common Share Basic earnings per common share (“EPS”) are calculated using the weighted average number of shares of common stock outstanding during each period. A reconciliation of the numerators and denominators of the basic and diluted EPS calculations follows. Three Months Ended Six Months Ended (In millions, except per share data) 2017 2016 2017 2016 Numerator: Net income attributable to Navient Corporation $ 112 $ 125 $ 200 $ 305 Denominator: Weighted average shares used to compute basic EPS 280 322 284 331 Effect of dilutive securities: Dilutive effect of stock options, non-vested (1) 5 6 7 4 Dilutive potential common shares (2) 5 6 7 4 Weighted average shares used to compute diluted EPS 285 328 291 335 Basic earnings (loss) per common share attributable to Navient Corporation $ .40 $ .39 $ .70 $ .92 Diluted earnings (loss) per common share attributable to Navient Corporation $ .39 $ .38 $ .69 $ .91 (1) Includes the potential dilutive effect of additional common shares that are issuable upon exercise of outstanding stock options, non-vested (2) For the three months ended June 30, 2017 and 2016, stock options covering approximately 5 million and 5 million shares, respectively, were outstanding but not included in the computation of diluted earnings per share because they were anti-dilutive. For the six months ended June 30, 2017 and 2016, stock options covering approximately 5 million and 5 million shares, respectively, were outstanding but not included in the computation of diluted earnings per share because they were anti-dilutive.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	8. Fair Value Measurements We use estimates of fair value in applying various accounting standards in our financial statements. We categorize our fair value estimates based on a hierarchical framework associated with three levels of price transparency utilized in measuring financial instruments at fair value. Please refer to “Note 12—Fair Value Measurements” in our 2016 Form 10-K During the three and six months ended June 30, 2017, there were no significant transfers of financial instruments between levels, or changes in our methodology or assumptions used to value our financial instruments. The following table summarizes the valuation of our financial instruments that are marked-to-market Fair Value Measurements on a Recurring Basis June 30, 2017 December 31, 2016 (Dollars in millions) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Available-for-sale Agency residential mortgage-backed securities $ — $ 1 $ — $ 1 $ — $ 1 $ — $ 1 Other — 2 — 2 — 2 — 2 Total available-for-sale — 3 — 3 — 3 — 3 Derivative instruments: (1) Interest rate swaps — 448 5 453 — 553 12 565 Cross-currency interest rate swaps — — 20 20 — — — — Other — — — — — — — — Total derivative assets (2) — 448 25 473 — 553 12 565 Total $ — $ 451 $ 25 $ 476 $ — $ 556 $ 12 $ 568 Liabilities (3) Derivative instruments (1) Interest rate swaps $ — $ (138 ) $ (53 ) $ (191 ) $ — $ (150 ) $ (58 ) $ (208 ) Floor Income Contracts — (158 ) — (158 ) — (184 ) — (184 ) Cross-currency interest rate swaps — (44 ) (686 ) (730 ) — (53 ) (1,243 ) (1,296 ) Other — — (22 ) (22 ) — — (13 ) (13 ) Total derivative liabilities (2) — (340 ) (761 ) (1,101 ) — (387 ) (1,314 ) (1,701 ) Total $ — $ (340 ) $ (761 ) $ (1,101 ) $ — $ (387 ) $ (1,314 ) $ (1,701 ) (1) Fair value of derivative instruments excludes accrued interest and the value of collateral. (2) See “Note 4—Derivative Financial Instruments” for a reconciliation of gross positions without the impact of master netting agreements to the balance sheet classification. (3) Borrowings which are the hedged items in a fair value hedge relationship and which are adjusted for changes in value due to benchmark interest rates only are not carried at full fair value and are not reflected in this table. The following tables summarize the change in balance sheet carrying value associated with level 3 financial instruments carried at fair value on a recurring basis. Three Months Ended June 30, 2017 2016 Derivative instruments Derivative instruments (Dollars in millions) Interest Cross Other Total Interest Cross Other Total Balance, beginning of period $ (42 ) $ (1,125 ) $ (16 ) $ (1,183 ) $ (32 ) $ (528 ) $ (4 ) $ (564 ) Total gains/(losses) (realized and unrealized): Included in earnings (1) (7 ) 430 (8 ) 415 (5 ) (293 ) (4 ) (302 ) Included in other comprehensive income — — — — — — — — Settlements 1 29 2 32 — 20 1 21 Transfers in and/or out of level 3 — — — — — — — — Balance, end of period $ (48 ) $ (666 ) $ (22 ) $ (736 ) $ (37 ) $ (801 ) $ (7 ) $ (845 ) Change in unrealized gains/(losses) relating to instruments still held at the reporting date (2) $ (6 ) $ 459 $ (6 ) $ 447 $ (4 ) $ (273 ) $ (4 ) $ (281 ) Six Months Ended June 30, 2017 2016 Derivative instruments Derivative instruments (Dollars in millions) Interest Cross Other Total Interest Cross Other Total Balance, beginning of period $ (46 ) $ (1,243 ) $ (13 ) $ (1,302 ) $ (44 ) $ (903 ) $ (2 ) $ (949 ) Total gains/(losses) (realized and unrealized): Included in earnings (1) (5 ) 519 (13 ) 501 6 65 (6 ) 65 Included in other comprehensive income — — — — — — — — Settlements 3 58 4 65 1 37 1 39 Transfers in and/or out of level 3 — — — — — — — — Balance, end of period $ (48 ) $ (666 ) $ (22 ) $ (736 ) $ (37 ) $ (801 ) $ (7 ) $ (845 ) Change in unrealized gains/(losses) relating to instruments still held at the reporting date (2) $ (2 ) $ 516 $ (9 ) $ 505 $ 8 $ 102 $ (6 ) $ 104 (1) “Included in earnings” is comprised of the following amounts recorded in the specified line item in the consolidated statements of income: Three Months Ended Six Months Ended (Dollars in millions) 2017 2016 2017 2016 Gains (losses) on derivative and hedging activities, net $ 444 $ (282 ) $ 559 $ 102 Interest expense (29 ) (20 ) (58 ) (37 ) Total $ 415 $ (302 ) $ 501 $ 65 (2) Recorded in “gains (losses) on derivative and hedging activities, net” in the consolidated statements of income. The following table presents the significant inputs that are unobservable or from inactive markets used in the recurring valuations of the level 3 financial instruments detailed above. (Dollars in millions) Fair Value at Valuation Input Range Derivatives Prime/LIBOR basis swaps $ (48 ) Discounted cash flow Constant prepayment rate 4.9% Bid/ask adjustment to .05% — .08% discount rate (.08%) Cross-currency interest rate swaps (666 ) Discounted cash flow Constant prepayment rate 3.3% Other (22 ) Total $ (736 ) The significant inputs that are unobservable or from inactive markets related to our level 3 derivatives detailed in the table above would be expected to have the following impacts to the valuations: • Prime/LIBOR basis swaps — These swaps do not actively trade in the markets as indicated by a wide bid/ask spread. A wider bid/ask spread will result in a decrease in the overall valuation. In addition, the unobservable inputs include Constant Prepayment Rates of the underlying securitization trust the swap references. A decrease in this input will result in a longer weighted average life of the swap which will increase the value for swaps in a gain position and decrease the value for swaps in a loss position, everything else equal. The opposite is true for an increase in the input. • Cross-currency interest rate swaps — The unobservable inputs used in these valuations are Constant Prepayment Rates of the underlying securitization trust the swap references. A decrease in this input will result in a longer weighted average life of the swap. All else equal in a typical currency market, this will result in a decrease to the valuation due to the delay in the cash flows of the currency exchanges as well as diminished liquidity in the forward exchange markets as you increase the term. The opposite is true for an increase in the input. The following table summarizes the fair values of our financial assets and liabilities, including derivative financial instruments. June 30, 2017 December 31, 2016 (Dollars in millions) Fair Carrying Difference Fair Carrying Difference Earning assets FFELP Loans $ 85,837 $ 86,140 $ (303 ) $ 86,626 $ 87,730 $ (1,104 ) Private Education Loans 24,569 24,223 346 23,191 23,340 (149 ) Cash and investments (1) 5,057 5,057 — 5,203 5,203 — Total earning assets 115,463 115,420 43 115,020 116,273 (1,253 ) Interest-bearing liabilities Short-term borrowings 3,950 3,918 (32 ) 2,346 2,334 (12 ) Long-term borrowings 109,764 110,778 1,014 109,826 112,368 2,542 Total interest-bearing liabilities 113,714 114,696 982 112,172 114,702 2,530 Derivative financial instruments Floor Income Contracts (158 ) (158 ) — (184 ) (184 ) — Interest rate swaps 262 262 — 357 357 — Cross-currency interest rate swaps (710 ) (710 ) — (1,296 ) (1,296 ) — Other (22 ) (22 ) — (13 ) (13 ) — Excess of net asset fair value over carrying value $ 1,025 $ 1,277 (1) “Cash and investments” includes available-for-sale

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	9. Commitments and Contingencies Legal Proceedings The Company has been named as defendant in a number of putative class action cases alleging violations of various state and federal consumer protection laws. One of these putative class action suits is Randy Johnson v. Navient Solutions, Inc. (“NSI”). On May 4, 2015, Randy Johnson filed a putative class action in the United States District Court for the Southern District of Indiana alleging violations of the Telephone Consumer Protection Act (“TCPA”). During the fourth quarter of 2016, the parties entered into a settlement agreement and, in December 2016, filed a Motion to Approve the Class Action Settlement with the Court. The Court approved the settlement in July, 2017. NSI denied all claims asserted, but agreed to settle the case to avoid the burden, expense, risk and uncertainty of continued litigation. A reserve was established for this matter as of December 31, 2016. On January 18, 2017, the CFPB and Attorneys General for the State of Illinois and the State of Washington (collectively the “Attorneys General”) initiated civil actions naming Navient Corporation and several of its subsidiaries as defendants alleging violations of certain Federal and State consumer protection statutes, including the Consumer Financial Protection Act of 2010, the Fair Credit Reporting Act, the Fair Debt Collection Practices Act and various state consumer protection laws. We intend to vigorously defend against the allegations. At this point in time, the Company is unable to anticipate the timing of a resolution or the ultimate impact that these legal proceedings may have on the Company’s consolidated financial position, liquidity, results of operation or cash flows. As a result, it is not possible at this time to estimate a range of potential exposure, if any, for amounts that may be payable in connection with these matters and reserves have not been established. It is possible that an adverse ruling or rulings may have a material adverse impact on the Company. For additional information on these civil actions, please refer to section entitled “Regulatory Matters” below. Regulatory Matters On May 2, 2014, Navient Solutions, Inc., now known as Navient Solutions, LLC (“Solutions”), a wholly-owned subsidiary of Navient, and Sallie Mae Bank entered into consent orders, without admitting any wrongdoing, with the Federal Deposit Insurance Corporation (the “FDIC”) (respectively, the “Solutions Order” and the “Bank Order”; collectively, the “FDIC Orders”) to settle matters related to certain cited violations of Section 5 of the Federal Trade Commission Act, including the disclosures and assessments of certain late fees, The FDIC lifted the FDIC Order with respect to Solutions effective as of March 23, 2017 with no conditions. With respect to alleged civil violations of the Servicemembers Civil Relief Act (the “SCRA”), Solutions and Sallie Mae Bank entered into a consent order with the DOJ in May 2014. The DOJ consent order (the “DOJ Order”) covers all loans either owned by Sallie Mae Bank or serviced by Solutions from November 28, 2005 until the effective date of the settlement. The DOJ Order required Solutions to fund a $60 million settlement fund, which represents the total amount of compensation due to service members under the DOJ agreement, and to pay $55,000 in civil penalties. The DOJ Order was approved by the United States District Court in Delaware on September 29, 2014 and has a term of four years. Shortly thereafter, Navient funded the settlement fund and paid the civil money penalties pursuant to the terms of the order. The funds were disbursed beginning in the second quarter of 2015. In the third quarter of 2016, the Company completed the distributions from the fund by distributing the remaining funds to charities approved by the DOJ pursuant to the terms of the order. The total reserves established by the Company in 2013 and 2014 to cover these costs were $177 million, and as of June 30, 2017, substantially all of this amount had been paid to customers or credited or refunded to customer accounts. The final cost of these proceedings will remain uncertain until all of the work under the consent orders has been completed and the remaining consent order is lifted. As previously disclosed, the Company and various of its subsidiaries have been subject to the following investigations and inquiries: • In December 2013, Navient received Civil Investigative Demands (“CIDs”) issued by the State of Illinois Office of Attorney General and the State of Washington Office of the Attorney General and multiple other state Attorneys General. According to the CIDs, the investigations were initiated to ascertain whether any practices declared to be unlawful under the Consumer Fraud and Deceptive Business Practices Act have occurred or are about to occur. • In April 2014, Solutions received a CID from the Consumer Financial Protection Bureau (the “CFPB”) as part of the CFPB’s separate investigation regarding allegations relating to Navient’s disclosures and assessment of late fees and other matters. Navient has received a series of supplemental CIDs on these matters. In August 2015, Solutions received a letter from the CFPB notifying Solutions that, in accordance with the CFPB’s discretionary Notice and Opportunity to Respond and Advise (“NORA”) process, the CFPB’s Office of Enforcement is considering recommending that the CFPB take legal action against Solutions. The NORA letter related to a previously disclosed investigation into Solutions’ disclosures and assessment of late fees and other matters and states that, in connection with any action, the CFPB may seek restitution, civil monetary penalties and corrective action against Solutions. The Company responded to the NORA letter in September 2015. • In November 2014, Navient’s subsidiary, Pioneer Credit Recovery, Inc. (“Pioneer”), received a CID from the CFPB as part of the CFPB’s investigation regarding Pioneer’s activities relating to rehabilitation loans and collection of defaulted student debt. • In December 2014, Solutions received a subpoena from the New York Department of Financial Services (the “NY DFS”) as part of the NY DFS’s inquiry with regard to whether persons or entities have engaged in fraud or misconduct with respect to a financial product or service under New York Financial Services Law or other laws. On January 18, 2017, the CFPB and Attorneys General for the State of Illinois and the State of Washington (collectively the “Attorneys General”) initiated civil actions naming Navient Corporation and several of its subsidiaries as defendants alleging violations of Federal and State consumer protection statutes, including the Consumer Financial Protection Act of 2010, the Fair Credit Reporting Act, the Fair Debt Collection Practices Act and various state consumer protection laws. These civil actions are related to the CIDs and the NORA letter discussed above that were previously issued by the CFPB and the Attorneys General. In addition to these matters, a number of lawsuits have been filed by nongovernmental parties or may be filed by additional governmental or nongovernmental parties seeking damages or other remedies related to similar issues raised by the CFPB and the Attorneys General. The Company filed its Motion to Dismiss on March 20, 2017 with respect to the Attorneys General actions and on March 24, 2017 with respect to the CFPB action. In April 2017, the CFPB filed a response to our Motion to Dismiss and in May 2017, we filed our response. A hearing on our Motion to Dismiss was held on June 27, 2017. On May 24, 2017, the Attorney General for the State of Washington filed their response to our Motion to Dismiss and on July 5, 2017, we filed our response. The Motion to Dismiss was denied on July 10, 2017, after a hearing. On May 24, 2017, the Attorney General for the State of Illinois filed their response to our Motion to Dismiss and on June 30, 2017, we filed our response. A hearing on our Motion to Dismiss was held on July 18, 2017. As the Company has previously stated, we believe the suit improperly seeks to impose penalties on Navient based on new servicing standards applied retroactively and applied only against one servicer and that the allegations are false. As stated above, we intend to vigorously defend against the allegations. In addition, Navient and its subsidiaries are subject to examination or regulation by the SEC, CFPB, FDIC, ED and various state agencies as part of its ordinary course of business. Items or matters similar to or different from those described above may arise during the course of those examinations. We also routinely receive inquiries or requests from various regulatory entities or bodies or government agencies concerning our business or our assets. The Company endeavors to cooperate with each such inquiry or request. Under the terms of the Separation Agreement, Navient has agreed to indemnify SLM BankCo for all claims, actions, damages, losses or expenses that may arise from the conduct of all activities of pre-Spin-Off Spin-Off OIG Audit The Office of the Inspector General (the “OIG”) of ED commenced an audit regarding Special Allowance Payments (“SAP”) on September 10, 2007. On September 25, 2013, we received the final audit determination of Federal Student Aid (the “Final Audit Determination”) on the final audit report issued by the OIG on August 3, 2009 related to this audit. The Final Audit Determination concurred with the final audit report issued by the OIG and instructed us to make adjustment to our government billing to reflect the policy determination. In August 2016, we filed our notice of appeal relating to this Final Audit Determination to the Administrative Actions and Appeals Service Group of ED. This matter remains open. We continue to believe that our SAP billing practices were proper, considering then-existing ED guidance and lack of applicable regulations. The Company established a reserve for this matter in 2014 as part of the total reserve for pending regulatory matters discussed previously and does not believe, at this time, that an adverse ruling would have a material effect on the Company as a whole. Contingencies In the ordinary course of business, we and our subsidiaries are defendants in or parties to pending and threatened legal actions and proceedings including actions brought on behalf of various classes of claimants. These actions and proceedings may be based on alleged violations of consumer protection, securities, employment and other laws. In certain of these actions and proceedings, claims for substantial monetary damage are asserted against us and our subsidiaries. In the ordinary course of business, we and our subsidiaries are subject to regulatory examinations, information gathering requests, inquiries and investigations. In connection with formal and informal inquiries in these cases, we and our subsidiaries receive numerous requests, subpoenas and orders for documents, testimony and information in connection with various aspects of our regulated activities. In view of the inherent difficulty of predicting the outcome of such litigation and regulatory matters, we cannot predict what the eventual outcome of the pending matters will be, what the timing or the ultimate resolution of these matters will be, or what the eventual loss, fines or penalties, if any, related to each pending matter may be. We are required to establish reserves for litigation and regulatory matters where those matters present loss contingencies that are both probable and estimable. When loss contingencies are not both probable and estimable, we do not establish reserves. Based on current knowledge, reserves have been established for certain litigation or regulatory matters where the loss is both probable and estimable. Based on current knowledge, management does not believe that loss contingencies, if any, arising from pending investigations, litigation or regulatory matters will have a material adverse effect on our consolidated financial position, liquidity, results of operations or cash flows, except as otherwise disclosed.

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Segment Reporting	10. Segment Reporting FFELP Loans Segment In the FFELP Loans segment, we acquire and finance FFELP Loans. Although FFELP Loans are no longer originated, we continue to pursue acquisitions of FFELP Loan portfolios. These acquisitions leverage our servicing scale and generate incremental earnings and cash flow. In this segment, we generate revenue primarily through net interest income on the FFELP Loan portfolio (after provision for loan losses). This segment is expected to generate significant amounts of earnings and cash flow as the portfolio amortizes. The following table includes GAAP basis asset information for our FFELP Loans segment. (Dollars in millions) June 30, December 31, FFELP Loans, net $ 86,140 $ 87,730 Cash and investments (1) 3,088 3,212 Other 1,979 1,907 Total assets $ 91,207 $ 92,849 (1) Includes restricted cash and investments. Private Education Loans Segment In this segment, we acquire, finance, and service our Private Education Loans. Private Education Loans primarily bridge the gap between the cost of higher education and the amount funded through financial aid, federal loans, or students’ and families’ resources. They also allow borrowers to refinance existing education loans at a lower rate. We pursue acquisitions of Private Education Loan portfolios. These acquisitions leverage our servicing scale and generate incremental earnings and cash flow. In this segment, we generate revenue primarily through net interest income on the Private Education Loan portfolio (after provision for loan losses). This segment is expected to generate significant amounts of earnings and cash flow as the portfolio amortizes. The following table includes GAAP basis asset information for our Private Education Loans segment. (Dollars in millions) June 30, December 31, Private Education Loans, net $ 24,223 $ 23,340 Cash and investments (1) 737 667 Other 1,513 1,567 Total assets $ 26,473 $ 25,574 (1) Includes restricted cash and investments. Business Services Segment Our Business Services segment generates revenue from business processing solutions related to servicing, asset recovery and other business processing activities. Within this segment, we generate revenue primarily through servicing our FFELP Loan portfolio as well as servicing education loans for Guarantors of FFELP Loans and other institutions, including ED. We provide asset recovery services for loans and receivables on behalf of Guarantors of FFELP Loans and higher education institutions. In addition, we provide asset recovery and other business processing solutions for federal, state, court, and municipal clients, public authorities, and health care organizations. At June 30, 2017 and December 31, 2016, the Business Services segment had total assets of $589 million and $587 million, respectively, on a GAAP basis. Other Segment Our Other segment primarily consists of activities of our holding company, including the repurchase of debt, our corporate liquidity portfolio, unallocated overhead and regulatory-related costs. We also include results from certain smaller wind-down operations within this segment. At June 30, 2017 and December 31, 2016, the Other segment had total assets of $2.1 billion on a GAAP basis. Measure of Profitability We prepare financial statements and present financial results in accordance with GAAP. However, we also evaluate our business segments and present financial results on a basis that differs from GAAP. We refer to this different basis of presentation as “Core Earnings.” We provide this “Core Earnings” basis of presentation on a consolidated basis for each business segment because this is what we review internally when making management decisions regarding our performance and how we allocate resources. We also refer to this information in our presentations with credit rating agencies, lenders and investors. Because our “Core Earnings” basis of presentation corresponds to our segment financial presentations, we are required by GAAP to provide “Core Earnings” disclosure in the notes to our consolidated financial statements for our business segments. “Core Earnings” are not a substitute for reported results under GAAP. We use “Core Earnings” to manage our business segments because “Core Earnings” reflect adjustments to GAAP financial results for three items, discussed below, that are either related to the Spin-Off 1. Unrealized mark-to-market 2. The accounting for goodwill and acquired intangible assets; and 3. The financial results attributable to the operations of SLM BankCo prior to the Spin-Off Spin-Off, post-Spin-Off. 10-Q 10-K While GAAP provides a uniform, comprehensive basis of accounting, for the reasons described above, our “Core Earnings” basis of presentation does not. “Core Earnings” are subject to certain general and specific limitations that investors should carefully consider. For example, there is no comprehensive, authoritative guidance for management reporting. Our “Core Earnings” are not defined terms within GAAP and may not be comparable to similarly titled measures reported by other companies. Accordingly, our “Core Earnings” presentation does not represent a comprehensive basis of accounting. Investors, therefore, may not be able to compare our performance with that of other financial services companies based upon “Core Earnings.” “Core Earnings” results are only meant to supplement GAAP results by providing additional information regarding the operational and performance indicators that are most closely used by management, our board of directors, credit rating agencies, lenders and investors to assess performance. Segment Results and Reconciliations to GAAP Three Months Ended June 30, 2017 (Dollars in millions) FFELP Private Business Other Elimina- (1) Total Adjustments Total Reclassi- Additions/ Total (2) Interest income: Education loans $ 664 $ 386 $ — $ — $ — $ 1,050 $ 18 $ (14 ) $ 4 $ 1,054 Other loans — — — 6 — 6 — — — 6 Cash and investments 7 1 — 2 — 10 — — — 10 Total interest income 671 387 — 8 — 1,066 18 (14 ) 4 1,070 Total interest expense 495 193 — 35 — 723 (1 ) (3 ) (4 ) 719 Net interest income (loss) 176 194 — (27 ) — 343 19 (11 ) 8 351 Less: provisions for loan losses 10 95 — — — 105 — — — 105 Net interest income (loss) after provisions for loan losses 166 99 — (27 ) — 238 19 (11 ) 8 246 Other income (loss): Servicing revenue 13 — 145 — (88 ) 70 — — — 70 Asset recovery and business processing revenue — — 111 — — 111 — — — 111 Other income (loss) — — — 4 — 4 (19 ) (4 ) (23 ) (19 ) Total other income (loss) 13 — 256 4 (88 ) 185 (19 ) (4 ) (23 ) 162 Expenses: Direct operating expenses 90 38 129 6 (88 ) 175 — — — 175 Overhead expenses — — — 55 — 55 — — — 55 Operating expenses 90 38 129 61 (88 ) 230 — — — 230 Goodwill and acquired intangible asset impairment and amortization — — — — — — — 6 6 6 Total expenses 90 38 129 61 (88 ) 230 — 6 6 236 Income (loss) before income tax expense (benefit) 89 61 127 (84 ) — 193 — (21 ) (21 ) 172 Income tax expense (benefit) (3) 32 22 46 (30 ) — 70 — (10 ) (10 ) 60 Net income (loss) $ 57 $ 39 $ 81 $ (54 ) $ — $ 123 $ — $ (11 ) $ (11 ) $ 112 (1) The eliminations in servicing revenue and direct operating expense represent the elimination of intercompany servicing revenue where the Business Services segment performs the loan servicing function for the FFELP Loans segment. (2) “Core Earnings” adjustments to GAAP: Three Months Ended June 30, 2017 (Dollars in millions) Net Impact of Net Impact of Total Net interest income (loss) after provisions for loan losses $ 8 $ — $ 8 Total other income (loss) (23 ) — (23 ) Goodwill and acquired intangible asset impairment and amortization — 6 6 Total “Core Earnings” adjustments to GAAP $ (15 ) $ (6 ) (21 ) Income tax expense (benefit) (10 ) Net income (loss) $ (11 ) (3) Income taxes are based on a percentage of net income before tax for the individual reportable segment. Three Months Ended June 30, 2016 (Dollars in millions) FFELP Private Business Other Elimina- (1) Total Adjustments Total Reclassi- Additions/ Total (2) Interest income: Education loans $ 588 $ 402 $ — $ — $ — $ 990 $ 56 $ (26 ) $ 30 $ 1,020 Other loans — — — 2 — 2 — — — 2 Cash and investments 5 — — 1 — 6 — — — 6 Total interest income 593 402 — 3 — 998 56 (26 ) 30 1,028 Total interest expense 388 173 — 29 — 590 9 — 9 599 Net interest income (loss) 205 229 — (26 ) — 408 47 (26 ) 21 429 Less: provisions for loan losses 10 100 — — — 110 — — — 110 Net interest income (loss) after provisions for loan losses 195 129 — (26 ) — 298 47 (26 ) 21 319 Other income (loss): Servicing revenue 14 3 153 — (99 ) 71 — — — 71 Asset recovery and business processing revenue — — 101 — — 101 — — — 101 Other income (loss) — — — 4 — 4 (47 ) (6 ) (53 ) (49 ) Total other income (loss) 14 3 254 4 (99 ) 176 (47 ) (6 ) (53 ) 123 Expenses: Direct operating expenses 101 41 125 7 (99 ) 175 — — — 175 Overhead expenses — — — 55 — 55 — — — 55 Operating expenses 101 41 125 62 (99 ) 230 — — — 230 Goodwill and acquired intangible asset impairment and amortization — — — — — — — 6 6 6 Total expenses 101 41 125 62 (99 ) 230 — 6 6 236 Income (loss) before income tax expense (benefit) 108 91 129 (84 ) — 244 — (38 ) (38 ) 206 Income tax expense (benefit) (3) 40 34 48 (32 ) — 90 — (9 ) (9 ) 81 Net income (loss) $ 68 $ 57 $ 81 $ (52 ) $ — $ 154 $ — $ (29 ) $ (29 ) $ 125 (1) The eliminations in servicing revenue and direct operating expense represent the elimination of intercompany servicing revenue where the Business Services segment performs the loan servicing function for the FFELP Loans segment. (2) “Core Earnings” adjustments to GAAP: Three Months Ended June 30, 2016 (Dollars in millions) Net Impact of Net Impact of Total Net interest income (loss) after provisions for loan losses $ 21 $ — $ 21 Total other income (loss) (53 ) — (53 ) Goodwill and acquired intangible asset impairment and amortization — 6 6 Total “Core Earnings” adjustments to GAAP $ (32 ) $ (6 ) (38 ) Income tax expense (benefit) (9 ) Net income (loss) $ (29 ) (3) Income taxes are based on a percentage of net income before tax for the individual reportable segment. Six Months Ended June 30, 2017 (Dollars in millions) FFELP Private Business Other Elimina- (1) Total Adjustments Total Reclassi- Additions/ Total (2) Interest income: Education loans $ 1,287 $ 760 $ — $ — $ — $ 2,047 $ 38 $ (27 ) $ 11 $ 2,058 Other loans — — — 10 — 10 — — — 10 Cash and investments 12 1 — 4 — 17 — — — 17 Total interest income 1,299 761 — 14 — 2,074 38 (27 ) 11 2,085 Total interest expense 951 380 — 66 — 1,397 2 (5 ) (3 ) 1,394 Net interest income (loss) 348 381 — (52 ) — 677 36 (22 ) 14 691 Less: provisions for loan losses 20 190 — 2 — 212 — — — 212 Net interest income (loss) after provisions for loan losses 328 191 — (54 ) — 465 36 (22 ) 14 479 Other income (loss): Servicing revenue 26 4 294 — (178 ) 146 — — — 146 Asset recovery and business processing revenue — — 210 — — 210 — — — 210 Other income (loss) — — 2 8 — 10 (36 ) (16 ) (52 ) (42 ) Total other income (loss) 26 4 506 8 (178 ) 366 (36 ) (16 ) (52 ) 314 Expenses: Direct operating expenses 183 78 256 12 (178 ) 351 — — — 351 Overhead expenses — — — 118 — 118 — — — 118 Operating expenses 183 78 256 130 (178 ) 469 — — — 469 Goodwill and acquired intangible asset impairment and amortization — — — — — — — 11 11 11 Total expenses 183 78 256 130 (178 ) 469 — 11 11 480 Income (loss) before income tax expense (benefit) 171 117 250 (176 ) — 362 — (49 ) (49 ) 313 Income tax expense (benefit) (3) 63 43 91 (65 ) — 132 — (19 ) (19 ) 113 Net income (loss) $ 108 $ 74 $ 159 $ (111 ) $ — $ 230 $ — $ (30 ) $ (30 ) $ 200 (1) The eliminations in servicing revenue and direct operating expense represent the elimination of intercompany servicing revenue where the Business Services segment performs the loan servicing function for the FFELP Loans segment. (2) “Core Earnings” adjustments to GAAP: Six Months Ended June 30, 2017 (Dollars in millions) Net Impact of Net Impact of Total Net interest income (loss) after provisions for loan losses $ 14 $ — $ 14 Total other income (loss) (52 ) — (52 ) Goodwill and acquired intangible asset impairment and amortization — 11 11 Total “Core Earnings” adjustments to GAAP $ (38 ) $ (11 ) (49 ) Income tax expense (benefit) (19 ) Net income (loss) $ (30 ) (3) Income taxes are based on a percentage of net income before tax for the individual reportable segment. Six Months Ended June 30, 2016 (Dollars in millions) FFELP Private Business Other Eliminations (1) Total Adjustments Total Reclassi- Additions/ Total (2) Interest income: Education loans $ 1,143 $ 813 $ — $ — $ — $ 1,956 $ 195 $ (86 ) $ 109 $ 2,065 Other loans — — — 3 — 3 — — — 3 Cash and investments 8 1 — 3 — 12 — — — 12 Total interest income 1,151 814 — 6 — 1,971 195 (86 ) 109 2,080 Total interest expense 746 345 — 56 — 1,147 18 — 18 1,165 Net interest income (loss) 405 469 — (50 ) — 824 177 (86 ) 91 915 Less: provisions for loan losses 17 204 — — — 221 — — — 221 Net interest income (loss) after provisions for loan losses 388 265 — (50 ) — 603 177 (86 ) 91 694 Other income (loss): Servicing revenue 31 8 315 — (200 ) 154 — — — 154 Asset recovery and business processing revenue — — 191 — — 191 — — — 191 Other income (loss) — — — 7 — 7 (177 ) 108 (69 ) (62 ) Total other income (loss) 31 8 506 7 (200 ) 352 (177 ) 108 (69 ) 283 Expenses: Direct operating expenses 206 84 258 14 (200 ) 362 — — — 362 Overhead expenses — — — 116 — 116 — — — 116 Operating expenses 206 84 258 130 (200 ) 478 — — — 478 Goodwill and acquired intangible asset impairment and amortization — — — — — — — 10 10 10 Total expenses 206 84 258 130 (200 ) 478 — 10 10 488 Income (loss) before income tax expense (benefit) 213 189 248 (173 ) — 477 — 12 12 489 Income tax expense (benefit) (3) 79 70 91 (64 ) — 176 — 8 8 184 Net income (loss) $ 134 $ 119 $ 157 $ (109 ) $ — $ 301 $ — $ 4 $ 4 $ 305 (1) The eliminations in servicing revenue and direct operating expense represent the elimination of intercompany servicing revenue where the Business Services segment performs the loan servicing function for the FFELP Loans segment. (2) “Core Earnings” adjustments to GAAP: Six Months Ended June 30, 2016 (Dollars in millions) Net Impact of Net Impact of Total Net interest income (loss) after provisions for loan losses $ 91 $ — $ 91 Total other income (loss) (69 ) — (69 ) Goodwill and acquired intangible asset impairment and amortization — 10 10 Total “Core Earnings” adjustments to GAAP $ 22 $ (10 ) 12 Income tax expense (benefit) 8 Net income (loss) $ 4 (3) Income taxes are based on a percentage of net income before tax for the individual reportable segment. Summary of “Core Earnings” Adjustments to GAAP Three Months Ended Six Months Ended (Dollars in millions) 2017 2016 2017 2016 “Core Earnings” adjustments to GAAP: Net impact of derivative accounting (1) $ (15 ) $ (32 ) $ (38 ) $ 22 Net impact of goodwill and acquired intangible assets (2) (6 ) (6 ) (11 ) (10 ) Net tax effect (3) 10 9 19 (8 ) Total “Core Earnings” adjustments to GAAP $ (11 ) $ (29 ) $ (30 ) $ 4 (1) Derivative accounting: mark-to-market (2) Goodwill and acquired intangible assets: (3) Net tax effect:

Significant Accounting Polici19

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited, consolidated financial statements of Navient have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete consolidated financial statements. The consolidated financial statements include the accounts of Navient and its majority-owned and controlled subsidiaries and those Variable Interest Entities (“VIEs”) for which we are the primary beneficiary, after eliminating the effects of intercompany accounts and transactions. In the opinion of management, all adjustments considered necessary for a fair statement of the results for the interim periods have been included. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Operating results for the three and six months ended June 30, 2017 are not necessarily indicative of the results for the year ending December 31, 2017 or for any other period. These unaudited financial statements should be read in conjunction with the audited financial statements and related notes included in our Annual Report on Form 10-K 10-K”). 10-Q 10-K.
Reclassifications	Reclassifications Certain reclassifications have been made to the balances as of and for the three and six months ended June 30, 2016 to be consistent with classifications adopted for 2017, and had no effect on net income, total assets, or total liabilities.
Education Loan Interest Income and Allowance for Loan Losses	Education Loan Interest Income and Allowance for Loan Losses In June 2017, Navient purchased education loans with an unpaid principal amount of $6.5 billion comprised of $3.5 billion in FFELP Loans and $3.0 billion in Private Education Loans. Purchased Credit Impaired (“PCI”) Loans Loans acquired with evidence of deterioration of credit quality since origination for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable are PCI loans accounted for under Accounting Standard Codification (“ASC”) 310-30, The Company aggregates loans with common risk characteristics into pools and accounts for each pool as a single asset with a single composite interest rate and an aggregate expectation of cash flows. The pools when formed are initially recorded at fair value. The Company recognizes interest income based on each pool’s effective interest rate which is based on our estimate of all cash flows expected to be received and includes an assumption about prepayment rates. The pools are tested quarterly for impairment by re-estimating Based on the credit attributes discussed above, we concluded that $261 million principal amount of Private Education Loans acquired in June 2017 are required to be accounted for as PCI loans with a fair value of $101 million as of the acquisition date. As of acquisition, this portfolio’s contractually required payments receivable (the total undiscounted amount of all uncollected contractual principal and interest payments both past due and scheduled for the future, adjusted for prepayments) was $411 million with an estimated accretable yield (income expected to be recognized in future periods) of $108 million. There is no valuation allowance recorded as of June 30, 2017. Purchased Non-Credit Impaired Loans Loans acquired that do not have evidence of credit deterioration since origination are recorded at fair value with no allowance for loan losses established at the acquisition date. Loan premiums and discounts are amortized as a part of interest income using the interest method under ASC 310-20,
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements Revenue Recognition On May 28, 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, We plan to adopt the new standard as of January 1, 2018, the effective date. The new standard permits the use of either the retrospective or cumulative effect transition method. Our implementation efforts to date include the identification of revenue and review of related contracts within the scope of the new standard. We have not yet identified nor do we anticipate material changes in the timing of revenue recognition. However, our review is ongoing as we continue to evaluate both contract revenue and certain contract costs. Classification and Measurement On January 5, 2016, the FASB issued ASU No. 2016-01, Leases On February 25, 2016, the FASB issued ASU No. 2016-02, right-of-use Stock Compensation On March 30, 2016, the FASB issued ASU No. 2016-09, paid-in Allowance for Loan Losses On June 16, 2016, the FASB issued ASU No. 2016-13, Intra-Entity Transfer of Assets On October 24, 2016, the FASB issued ASU No. 2016-16, non-inventory Goodwill Impairment On January 26, 2017, the FASB issued ASU No. 2017-04, two-step

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	6 Months Ended
	Jun. 30, 2017
Allowance for Credit Losses and Recorded Investments in Loans	Allowance for Loan Losses Metrics Three Months Ended June 30, 2017 (Dollars in millions) FFELP Loans Private Education Other Total Allowance for Loan Losses Beginning balance $ 64 $ 1,311 $ 16 $ 1,391 Total provision 10 95 — 105 Charge-offs (1) (13 ) (122 ) (1 ) (136 ) Reclassification of interest reserve (2) — 2 — 2 Ending balance $ 61 $ 1,286 $ 15 $ 1,362 Allowance Ending Balance: Individually evaluated for impairment $ — $ 1,153 $ 10 $ 1,163 Collectively evaluated for impairment: Excluding Purchased Non-Credit 61 133 5 199 Purchased Non-Credit (3) — — — — Purchased Credit Impaired Loans (3) — — — — Ending total allowance $ 61 $ 1,286 $ 15 $ 1,362 Loans Ending Balance: Individually evaluated for impairment $ — $ 11,020 $ 31 $ 11,051 Collectively evaluated for impairment: Excluding Purchased Non-Credit 81,984 12,467 174 94,625 Purchased Non-Credit (3) 3,463 2,755 — 6,218 Purchased Credit Impaired Loans (3) — 261 — 261 Ending total loans (4) $ 85,447 $ 26,503 $ 205 $ 112,155 Charge-offs as a percentage of average loans in repayment (annualized) .08 % 2.25 % 2.37 % Allowance coverage of charge-offs (annualized) 1.1 2.6 3.3 Allowance as a percentage of the ending total loan balance (3) .07 % 4.85 % 7.49 % Allowance as a percentage of the ending loans in repayment (3) .09 % 5.45 % 7.49 % Ending total loans (4) $ 85,447 $ 26,503 $ 205 Average loans in repayment $ 68,915 $ 21,621 $ 197 Ending loans in repayment $ 70,095 $ 23,613 $ 205 (1) Charge-offs are reported net of expected recoveries. For Private Education Loans, the expected recovery amount is transferred to the receivable for partially charged-off charged-off Charged-Off (2) Represents the additional allowance related to the amount of uncollectible interest reserved within interest income that is transferred in the period to the allowance for loan losses when interest is capitalized to a loan’s principal balance. (3) See “Note 1 – Significant Accounting Policies – Education Loan Interest Income and Allowance for Loan Losses” for a description of our policy for the $6.5 billion of loans ($3.5 billion of FFELP and $3.0 billion of Private Education) purchased in June 2017 accounted for as either Purchased Credit Impaired Loans or Purchased Non-Credit Non-Credit (4) Ending total loans for Private Education Loans includes the receivable for partially charged-off Three Months Ended June 30, 2016 (Dollars in millions) FFELP Loans Private Education Other Total Allowance for Loan Losses Beginning balance $ 69 $ 1,434 $ 15 $ 1,518 Total provision 10 100 — 110 Charge-offs (1) (13 ) (127 ) — (140 ) Reclassification of interest reserve (2) — 3 — 3 Ending balance $ 66 $ 1,410 $ 15 $ 1,491 Allowance: Ending balance: individually evaluated for impairment $ — $ 1,163 $ 11 $ 1,174 Ending balance: collectively evaluated for impairment 66 247 4 317 Ending total allowance $ 66 $ 1,410 $ 15 $ 1,491 Loans: Ending balance: individually evaluated for impairment (3) $ — $ 11,162 $ 33 $ 11,195 Ending balance: collectively evaluated for impairment (3) 91,625 15,478 47 107,150 Ending total loans (3) $ 91,625 $ 26,640 $ 80 $ 118,345 Charge-offs as a percentage of average loans in repayment (annualized) .07 % 2.17 % 1.32 % Allowance coverage of charge-offs (annualized) 1.2 2.8 13.5 Allowance as a percentage of the ending total loan balance .07 % 5.29 % 18.18 % Allowance as a percentage of the ending loans in repayment .09 % 6.06 % 18.18 % Ending total loans (3) $ 91,625 $ 26,640 $ 80 Average loans in repayment $ 72,980 $ 23,561 $ 82 Ending loans in repayment $ 71,991 $ 23,265 $ 80 (1) Charge-offs are reported net of expected recoveries. For Private Education Loans, the expected recovery amount is transferred to the receivable for partially charged-off charged-off Charged-Off (2) Represents the additional allowance related to the amount of uncollectible interest reserved within interest income that is transferred in the period to the allowance for loan losses when interest is capitalized to a loan’s principal balance. (3) Ending total loans for Private Education Loans includes the receivable for partially charged-off Six Months Ended June 30, 2017 (Dollars in millions) FFELP Loans Private Education Other Total Allowance for Loan Losses Beginning balance $ 67 $ 1,351 $ 15 $ 1,433 Total provision 20 190 2 212 Charge-offs (1) (26 ) (259 ) (2 ) (287 ) Reclassification of interest reserve (2) — 4 — 4 Ending balance $ 61 $ 1,286 $ 15 $ 1,362 Allowance Ending Balance: Individually evaluated for impairment $ — $ 1,153 $ 10 $ 1,163 Collectively evaluated for impairment: Excluding Purchased Non-Credit 61 133 5 199 Purchased Non-Credit (3) — — — — Purchased Credit Impaired Loans (3) — — — — Ending total allowance $ 61 $ 1,286 $ 15 $ 1,362 Loans Ending Balance: Individually evaluated for impairment $ — $ 11,020 $ 31 $ 11,051 Collectively evaluated for impairment: Excluding Purchased Non-Credit 81,984 12,467 174 94,625 Purchased Non-Credit (3) 3,463 2,755 — 6,218 Purchased Credit Impaired Loans (3) — 261 — 261 Ending total loans (4) $ 85,447 $ 26,503 $ 205 $ 112,155 Charge-offs as a percentage of average loans in repayment (annualized) .08 % 2.40 % 2.22 % Allowance coverage of charge-offs (annualized) 1.2 2.5 3.7 Allowance as a percentage of the ending total loan balance (3) .07 % 4.85 % 7.49 % Allowance as a percentage of the ending loans in repayment (3) .09 % 5.45 % 7.49 % Ending total loans (4) $ 85,447 $ 26,503 $ 205 Average loans in repayment $ 69,108 $ 21,706 $ 185 Ending loans in repayment $ 70,095 $ 23,613 $ 205 (1) Charge-offs are reported net of expected recoveries. For Private Education Loans, the expected recovery amount is transferred to the receivable for partially charged-off charged-off Charged-Off (2) Represents the additional allowance related to the amount of uncollectible interest reserved within interest income that is transferred in the period to the allowance for loan losses when interest is capitalized to a loan’s principal balance. (3) See “Note 1 – Significant Accounting Policies – Education Loan Interest Income and Allowance for Loan Losses” for a description of our policy for the $6.5 billion of loans ($3.5 billion of FFELP and $3.0 billion of Private Education) purchased in June 2017 accounted for as either Purchased Credit Impaired Loans or Purchased Non-Credit Non-Credit (4) Ending total loans for Private Education Loans includes the receivable for partially charged-off Six Months Ended June 30, 2016 (Dollars in millions) FFELP Loans Private Education Other Total Allowance for Loan Losses Beginning balance $ 78 $ 1,471 $ 15 $ 1,564 Total provision 17 204 — 221 Charge-offs (1) (29 ) (271 ) — (300 ) Reclassification of interest reserve (2) — 6 — 6 Ending balance $ 66 $ 1,410 $ 15 $ 1,491 Allowance: Ending balance: individually evaluated for impairment $ — $ 1,163 $ 11 $ 1,174 Ending balance: collectively evaluated for impairment 66 247 4 317 Ending total allowance $ 66 $ 1,410 $ 15 $ 1,491 Loans: Ending balance: individually evaluated for impairment (3) $ — $ 11,162 $ 33 $ 11,195 Ending balance: collectively evaluated for impairment (3) 91,625 15,478 47 107,150 Ending total loans (3) $ 91,625 $ 26,640 $ 80 $ 118,345 Charge-offs as a percentage of average loans in repayment (annualized) .08 % 2.28 % 1.69 % Allowance coverage of charge-offs (annualized) 1.1 2.6 10.4 Allowance as a percentage of the ending total loan balance .07 % 5.29 % 18.18 % Allowance as a percentage of the ending loans in repayment .09 % 6.06 % 18.18 % Ending total loans (3) $ 91,625 $ 26,640 $ 80 Average loans in repayment $ 73,339 $ 23,871 $ 83 Ending loans in repayment $ 71,991 $ 23,265 $ 80 (1) Charge-offs are reported net of expected recoveries. For Private Education Loans, the expected recovery amount is transferred to the receivable for partially charged-off charged-off Charged-Off (2) Represents the additional allowance related to the amount of uncollectible interest reserved within interest income that is transferred in the period to the allowance for loan losses when interest is capitalized to a loan’s principal balance. (3) Ending total loans for Private Education Loans includes the receivable for partially charged-off
Age Analysis of Past Due Loans Delinquencies	The following tables provide information regarding the loan status and aging of past due loans. FFELP Loan Delinquencies June 30, December 31, (Dollars in millions) Balance % Balance % Loans in-school/grace/deferment (1) $ 5,538 $ 5,871 Loans in forbearance (2) 9,814 10,490 Loans in repayment and percentage of each status: Loans current 61,108 87.2 % 61,977 87.8 % Loans delinquent 31-60 (3) 3,187 4.5 2,820 4.0 Loans delinquent 61-90 (3) 1,596 2.3 1,325 1.9 Loans delinquent greater than 90 days (3) 4,204 6.0 4,435 6.3 Total FFELP Loans in repayment 70,095 100 % 70,557 100 % Total FFELP Loans, gross 85,447 86,918 FFELP Loan unamortized premium 754 879 Total FFELP Loans 86,201 87,797 FFELP Loan allowance for losses (61 ) (67 ) FFELP Loans, net $ 86,140 $ 87,730 Percentage of FFELP Loans in repayment 82.0 % 81.2 % Delinquencies as a percentage of FFELP Loans in repayment 12.8 % 12.2 % FFELP Loans in forbearance as a percentage of loans in repayment and forbearance 12.3 % 12.9 % (1) Loans for customers who may still be attending school or engaging in other permitted educational activities and are not yet required to make payments on their loans, e.g., residency periods for medical students or a grace period for bar exam preparation, as well as loans for customers who have requested and qualify for other permitted program deferments such as military, unemployment, or economic hardships. (2) Loans for customers who have used their allowable deferment time or do not qualify for deferment, that need additional time to obtain employment or who have temporarily ceased making full payments due to hardship or other factors. (3) The period of delinquency is based on the number of days scheduled payments are contractually past due. Traditional Private Education Loan June 30, December 31, (Dollars in millions) Balance % Balance % Loans in-school/grace/deferment (1) $ 1,122 $ 1,271 Loans in forbearance (2) 771 700 Loans in repayment and percentage of each status: Loans current 20,496 94.5 % 19,020 93.3 % Loans delinquent 31-60 (3) 413 1.9 444 2.2 Loans delinquent 61-90 (3) 240 1.1 269 1.3 Loans delinquent greater than 90 days (3) 541 2.5 663 3.2 Total traditional loans in repayment 21,690 100 % 20,396 100 % Total traditional loans, gross 23,583 22,367 Traditional loans unamortized discount (884 ) (402 ) Total traditional loans 22,699 21,965 Traditional loans receivable for partially charged-off 509 526 Traditional loans allowance for losses (1,083 ) (1,138 ) Traditional loans, net $ 22,125 $ 21,353 Percentage of traditional loans in repayment 92.0 % 91.2 % Delinquencies as a percentage of traditional loans in repayment 5.5 % 6.7 % Loans in forbearance as a percentage of loans in repayment and forbearance 3.4 % 3.3 % (1) Deferment includes customers who have returned to school or are engaged in other permitted educational activities and are not yet required to make payments on their loans, e.g., residency periods for medical students or a grace period for bar exam preparation. (2) Loans for customers who have requested extension of grace period generally during employment transition or who have temporarily ceased making full payments due to hardship or other factors, consistent with established loan program servicing policies and procedures. (3) The period of delinquency is based on the number of days scheduled payments are contractually past due. Non-Traditional Private Education Loan June 30, December 31, (Dollars in millions) Balance % Balance % Loans in-school/grace/deferment (1) $ 114 $ 122 Loans in forbearance (2) 99 90 Loans in repayment and percentage of each status: Loans current 1,691 87.9 % 1,486 84.8 % Loans delinquent 31-60 (3) 68 3.6 78 4.5 Loans delinquent 61-90 (3) 47 2.4 52 2.9 Loans delinquent greater than 90 days (3) 117 6.1 138 7.8 Total non-traditional 1,923 100 % 1,754 100 % Total non-traditional 2,136 1,966 Non-traditional (110 ) (55 ) Total non-traditional 2,026 1,911 Non-traditional charged-off 275 289 Non-traditional (203 ) (213 ) Non-traditional $ 2,098 $ 1,987 Percentage of non-traditional 90.0 % 89.2 % Delinquencies as a percentage of non-traditional 12.1 % 15.2 % Loans in forbearance as a percentage of loans in repayment and forbearance 4.9 % 4.9 % (1) Deferment includes customers who have returned to school or are engaged in other permitted educational activities and are not yet required to make payments on their loans, e.g., residency periods for medical students or a grace period for bar exam preparation. (2) Loans for customers who have requested extension of grace period generally during employment transition or who have temporarily ceased making full payments due to hardship or other factors, consistent with established loan program servicing policies and procedures. (3) The period of delinquency is based on the number of days scheduled payments are contractually past due.
Loans Modified Accounts for TDR	The following table provides the recorded investment, unpaid principal balance and related allowance for our TDR loans. TDR Loans (Dollars in millions) Recorded (1) Unpaid Related June 30, 2017 Private Education Loans — Traditional $ 9,277 $ 9,322 $ 973 Private Education Loans — Non-Traditional 1,317 1,323 180 Total $ 10,594 $ 10,645 $ 1,153 December 31, 2016 Private Education Loans — Traditional $ 9,386 $ 9,429 $ 1,003 Private Education Loans — Non-Traditional 1,373 1,376 187 Total $ 10,759 $ 10,805 $ 1,190 (1) The recorded investment is equal to the unpaid principal balance and accrued interest receivable net of unamortized deferred fees and costs.
Entity Loan Modification Program [Member]
Loans Modified Accounts for TDR	The following table provides the amount of loans modified in the periods presented that resulted in a TDR. Additionally, the table summarizes charge-offs occurring in the TDR portfolio, as well as TDRs for which a payment default occurred in the current period within 12 months of the loan first being designated as a TDR. We define payment default as 60 days past due for this disclosure. Three Months Ended June 30, 2017 2016 (Dollars in millions) Modified (1) Charge- (2) Payment Modified (1) Charge- (2) Payment Private Education Loans — Traditional $ 189 $ 74 $ 41 $ 286 $ 74 $ 56 Private Education Loans — Non-Traditional 14 20 6 25 20 10 Total $ 203 $ 94 $ 47 $ 311 $ 94 $ 66 Six Months Ended June 30, 2017 2016 (Dollars in millions) Modified (1) Charge- (2) Payment Modified (1) Charge- (2) Payment Private Education Loans — Traditional $ 388 $ 160 $ 88 $ 628 $ 154 $ 118 Private Education Loans — Non-Traditional 30 40 13 52 42 21 Total $ 418 $ 200 $ 101 $ 680 $ 196 $ 139 (1) Represents period ending balance of loans that have been modified during the period and resulted in a TDR. (2) Represents loans that charged off that were classified as TDRs.
Troubled Debt Restructuring Loans [Member]
Age Analysis of Past Due Loans Delinquencies	The following table provides information regarding the loan status and aging of TDR loans that are past due. TDR Loan Delinquencies June 30, 2017 December 31, 2016 (Dollars in millions) Balance % Balance % Loans in deferment (1) $ 509 $ 579 Loans in forbearance (2) 624 588 Loans in repayment and percentage of each status: Loans current 8,367 88.0 % 8,273 85.8 % Loans delinquent 31-60 (3) 355 3.7 412 4.3 Loans delinquent 61-90 (3) 223 2.3 267 2.8 Loans delinquent greater than 90 days (3) 567 6.0 686 7.1 Total TDR loans in repayment 9,512 100 % 9,638 100 % Total TDR loans, gross $ 10,645 $ 10,805 (1) Deferment includes customers who have returned to school or are engaged in other permitted educational activities and are not yet required to make payments on their loans, e.g., residency periods for medical students or a grace period for bar exam preparation. (2) Loans for customers who have requested extension of grace period generally during employment transition or who have temporarily ceased making full payments due to hardship or other factors, consistent with established loan program servicing policies and procedures. (3) The period of delinquency is based on the number of days scheduled payments are contractually past due.
Average Recorded Investment and Interest Income Recognized for TDR	The following tables provide the average recorded investment and interest income recognized for our TDR loans. Three Months Ended June 30, 2017 2016 (Dollars in millions) Average Interest Average Interest Private Education Loans — Traditional $ 9,307 $ 149 $ 9,320 $ 138 Private Education Loans — Non-Traditional 1,333 27 1,418 27 Total $ 10,640 $ 176 $ 10,738 $ 165 Six Months Ended June 30, 2017 2016 (Dollars in millions) Average Interest Average Interest Private Education Loans — Traditional $ 9,337 $ 295 $ 9,271 $ 276 Private Education Loans — Non-Traditional 1,346 53 1,425 54 Total $ 10,683 $ 348 $ 10,696 $ 330
Private Education Loans [Member]
Private Education Loan Portfolio Stratified by Key Credit Quality Indicators	The following table highlights the principal balance (excluding the receivable for partially charged-off Private Education Loans June 30, 2017 December 31, 2016 (Dollars in millions) Balance (3) % of Balance Balance (3) % of Balance Credit Quality Indicators School Type/FICO Scores: Traditional $ 23,583 92 % $ 22,367 92 % Non-Traditional (1) 2,136 8 1,966 8 Total $ 25,719 100 % $ 24,333 100 % Cosigners: With cosigner $ 16,714 65 % $ 15,610 64 % Without cosigner 9,005 35 8,723 36 Total $ 25,719 100 % $ 24,333 100 % Seasoning (2) : 1-12 $ 1,402 5 % $ 1,340 5 % 13-24 1,152 5 1,271 5 25-36 1,723 7 1,908 8 37-48 2,673 10 2,723 11 More than 48 payments 17,533 68 15,698 65 Not yet in repayment 1,236 5 1,393 6 Total $ 25,719 100 % $ 24,333 100 % (1) Defined as loans to customers attending for-profit not-for-profit (2) Number of months in active repayment for which a scheduled payment was received. (3) Balance represents gross Private Education Loans.
Receivable for Partially Charged-Off Private Education Loans	The following table summarizes the activity in the receivable for partially charged-off Three Months Ended Six Months Ended (Dollars in millions) 2017 2016 2017 2016 Receivable at beginning of period $ 800 $ 867 $ 815 $ 881 Expected future recoveries of current period defaults (1) 29 32 63 68 Recoveries (2) (40 ) (49 ) (84 ) (95 ) Charge-offs (3) (5 ) (3 ) (10 ) (7 ) Receivable at end of period $ 784 $ 847 $ 784 $ 847 (1) Represents our estimate of the amount to be collected in the future. (2) Current period cash collections. (3) Represents the current period recovery shortfall — the difference between what was expected to be collected and what was actually collected. These amounts are included in total charge-offs as reported in the “Allowance for Private Education Loan Losses” table.
Accrued Interest Receivable	The following table provides information regarding accrued interest receivable on our Private Education Loans. (Dollars in millions) Accrued Greater Than Allowance for June 30, 2017 Private Education Loans — Traditional $ 341 $ 20 $ 20 Private Education Loans — Non-Traditional 49 6 6 Total $ 390 $ 26 $ 26 December 31, 2016 Private Education Loans — Traditional $ 344 $ 26 $ 23 Private Education Loans — Non-Traditional 47 7 7 Total $ 391 $ 33 $ 30

Borrowings (Tables)

Borrowings (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Company's Borrowings	The following table summarizes our borrowings. June 30, 2017 December 31, 2016 (Dollars in millions) Short Long Total Short Long Total Unsecured borrowings: Senior unsecured debt $ 1,937 $ 12,358 $ 14,295 $ 717 $ 13,029 $ 13,746 Total unsecured borrowings 1,937 12,358 14,295 717 13,029 13,746 Secured borrowings: FFELP Loan securitizations — 73,025 73,025 — 73,522 73,522 Private Education Loan securitizations (1) 685 13,000 13,685 548 14,125 14,673 FFELP Loan — other facilities — 10,729 10,729 — 12,443 12,443 Private Education Loan — other facilities 613 1,879 2,492 464 — 464 Other (2) 632 — 632 606 — 606 Total secured borrowings 1,930 98,633 100,563 1,618 100,090 101,708 Total before hedge accounting adjustments 3,867 110,991 114,858 2,335 113,119 115,454 Hedge accounting adjustments 51 (213 ) (162 ) (1 ) (751 ) (752 ) Total $ 3,918 $ 110,778 $ 114,696 $ 2,334 $ 112,368 $ 114,702 (1) Includes $685 million and $548 million of short-term debt related to the Private Education Loan asset-backed securitization repurchase facilities (“Repurchase Facilities”) as of June 30, 2017 and December 31, 2016, respectively. Includes $957 million and $475 million of long-term debt related to the Repurchase Facilities as of June 30, 2017 and December 31, 2016, respectively. (2) “Other” primarily includes the obligation to return cash collateral held related to derivative exposures, which includes $139 million and $193 million of securities re-pledged
Financing VIEs	We consolidated the following financing VIEs as of June 30, 2017 and December 31, 2016, as we are the primary beneficiary. As a result, these VIEs are accounted for as secured borrowings. June 30, 2017 Debt Outstanding Carrying Amount of Assets Securing (Dollars in millions) Short Long Total Loans Cash Other Total Secured Borrowings — VIEs: FFELP Loan securitizations $ — $ 73,025 $ 73,025 $ 73,795 $ 2,659 $ 868 $ 77,322 Private Education Loan securitizations (1) 685 13,000 13,685 18,275 500 232 19,007 FFELP Loan — other facilities — 7,689 7,689 7,856 210 163 8,229 Private Education Loan — other facilities 613 1,879 2,492 3,255 58 45 3,358 Other 112 — 112 135 6 — 141 Total before hedge accounting adjustments 1,410 95,593 97,003 103,316 3,433 1,308 108,057 Hedge accounting adjustments — (598 ) (598 ) — — (697 ) (697 ) Total $ 1,410 $ 94,995 $ 96,405 $ 103,316 $ 3,433 $ 611 $ 107,360 December 31, 2016 Debt Outstanding Carrying Amount of Assets Securing (Dollars in millions) Short Long Total Loans Cash Other Total Secured Borrowings — VIEs: FFELP Loan securitizations $ — $ 73,522 $ 73,522 $ 74,197 $ 2,676 $ 778 $ 77,651 Private Education Loan securitizations (1) 548 14,125 14,673 19,815 455 260 20,530 FFELP Loan — other facilities — 9,046 9,046 9,232 289 172 9,693 Private Education Loan — other facilities 464 — 464 685 10 14 709 Other 66 — 66 79 4 — 83 Total before hedge accounting adjustments 1,078 96,693 97,771 104,008 3,434 1,224 108,666 Hedge accounting adjustments — (1,201 ) (1,201 ) — — (1,235 ) (1,235 ) Total $ 1,078 $ 95,492 $ 96,570 $ 104,008 $ 3,434 $ (11 ) $ 107,431 (1) Includes $687 million of short-term debt, $964 million of long-term debt and $52 million of restricted cash related to the Repurchase Facilities as of June 30, 2017. Includes $548 million of short-term debt, $475 million of long-term debt and $49 million of restricted cash related to the Repurchase Facilities as of December 31, 2016.

Derivative Financial Instrume22

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Impact of Derivatives on Consolidated Balance Sheet	Impact of Derivatives on Consolidated Balance Sheet Cash Flow Fair Value Trading Total (Dollars in millions) Hedged Risk Jun. 30, Dec. 31, Jun. 30, Dec. 31, Jun. 30, Dec. 31, Jun. 30, Dec. 31, Fair Values (1) Derivative Assets: Interest rate swaps Interest rate $ 47 $ 78 $ 396 $ 465 $ 10 $ 22 $ 453 $ 565 Cross-currency interest rate swaps Foreign currency — — 20 — — — 20 — Other (2) Interest rate — — — — — — — — Total derivative assets (3) 47 78 416 465 10 22 473 565 Derivative Liabilities: Interest rate swaps Interest rate (57 ) (76 ) (60 ) (62 ) (74 ) (70 ) (191 ) (208 ) Floor Income Contracts Interest rate — — — — (158 ) (184 ) (158 ) (184 ) Cross-currency interest rate swaps Foreign currency — — (686 ) (1,243 ) (44 ) (53 ) (730 ) (1,296 ) Other (2) Interest rate — — — — (22 ) (13 ) (22 ) (13 ) Total derivative (3) (57 ) (76 ) (746 ) (1,305 ) (298 ) (320 ) (1,101 ) (1,701 ) Net total derivatives $ (10 ) $ 2 $ (330 ) $ (840 ) $ (288 ) $ (298 ) $ (628 ) $ (1,136 ) (1) Fair values reported are exclusive of collateral held and pledged and accrued interest. Assets and liabilities are presented without consideration of master netting agreements. Derivatives are carried on the balance sheet based on net position by counterparty under master netting agreements, and classified in other assets or other liabilities depending on whether in a net positive or negative position. (2) “Other” includes embedded derivatives bifurcated from securitization debt as well as derivatives related to our Total Return Swap Facility. (3) The following table reconciles gross positions without the impact of master netting agreements to the balance sheet classification:
Gross Positions with Impact of Master Netting Agreements	Other Assets Other Liabilities (Dollar in millions) June 30, December 31, June 30, December 31, Gross position $ 473 $ 565 $ (1,101 ) $ (1,701 ) Impact of master netting agreements (41 ) (31 ) 41 31 Derivative values with impact of master netting agreements (as carried on balance sheet) 432 534 (1,060 ) (1,670 ) Cash collateral (held) pledged (379 ) (345 ) 283 319 Net position $ 53 $ 189 $ (777 ) $ (1,351 )
Derivative Notional Values	Cash Flow Fair Value Trading Total (Dollars in billions) Jun. 30, Dec. 31, Jun. 30, Dec. 31, Jun. 30, Dec. 31, Jun. 30, Dec. 31, Notional Values: Interest rate swaps $ 20.0 $ 15.2 $ 12.8 $ 11.8 $ 47.3 $ 23.8 $ 80.1 $ 50.8 Floor Income Contracts — — — — 21.9 18.5 21.9 18.5 Cross-currency interest rate swaps — — 7.4 8.5 .3 .3 7.7 8.8 Other (1) — — — — 2.3 2.6 2.3 2.6 Total derivatives $ 20.0 $ 15.2 $ 20.2 $ 20.3 $ 71.8 $ 45.2 $ 112.0 $ 80.7 (1) “Other” includes embedded derivatives bifurcated from securitization debt as well as derivatives related to our Total Return Swap Facility.
Impact of Derivatives on Consolidated Statements of Income	Impact of Derivatives on Consolidated Statements of Income Three Months Ended June 30, Unrealized Gain (1)(2) Realized Gain (3) Unrealized Gain (1) Total Gain (Loss) (Dollars in millions) 2017 2016 2017 2016 2017 2016 2017 2016 Fair Value Hedges: Interest rate swaps $ 18 $ 71 $ 46 $ 68 $ (38 ) $ (68 ) $ 26 $ 71 Cross-currency interest rate swaps 459 (275 ) (29 ) (20 ) (442 ) 252 (12 ) (43 ) Total fair value derivatives 477 (204 ) 17 48 (480 ) 184 14 28 Cash Flow Hedges: Interest rate swaps — — (14 ) (11 ) — — (14 ) (11 ) Total cash flow derivatives — — (14 ) (11 ) — — (14 ) (11 ) Trading: Interest rate swaps (8 ) 11 5 11 — — (3 ) 22 Floor Income Contracts 13 7 (18 ) (56 ) — — (5 ) (49 ) Cross-currency interest rate swaps (4 ) 25 (2 ) (1 ) — — (6 ) 24 Other (6 ) (4 ) (2 ) (1 ) — — (8 ) (5 ) Total trading derivatives (5 ) 39 (17 ) (47 ) — — (22 ) (8 ) Total 472 (165 ) (14 ) (10 ) (480 ) 184 (22 ) 9 Less: realized gains (losses) recorded in interest expense — — 3 37 — — 3 37 Gains (losses) on derivative and hedging activities, net $ 472 $ (165 ) $ (17 ) $ (47 ) $ (480 ) $ 184 $ (25 ) $ (28 ) (1) Recorded in “Gains (losses) on derivative and hedging activities, net” in the consolidated statements of income. (2) Represents ineffectiveness related to cash flow hedges. (3) For fair value and cash flow hedges, recorded in interest expense. For trading derivatives, recorded in “Gains (losses) on derivative and hedging activities, net.” Six Months Ended June 30, Unrealized Gain (1)(2) Realized Gain (3) Unrealized Gain (1) Total Gain (Loss) (Dollars in millions) 2017 2016 2017 2016 2017 2016 2017 2016 Fair Value Hedges: Interest rate swaps $ (66 ) $ 315 $ 100 $ 139 $ 23 $ (347 ) $ 57 $ 107 Cross-currency interest rate swaps 577 99 (58 ) (36 ) (604 ) (54 ) (85 ) 9 Total fair value derivatives 511 414 42 103 (581 ) (401 ) (28 ) 116 Cash Flow Hedges: Interest rate swaps — — (30 ) (11 ) — — (30 ) (11 ) Total cash flow derivatives — — (30 ) (11 ) — — (30 ) (11 ) Trading: Interest rate swaps (15 ) 63 25 20 — — 10 83 Floor Income Contracts 66 34 (38 ) (194 ) — — 28 (160 ) Cross-currency interest rate swaps 8 45 (3 ) (2 ) — — 5 43 Other (10 ) (5 ) (4 ) (1 ) — — (14 ) (6 ) Total trading derivatives 49 137 (20 ) (177 ) — — 29 (40 ) Total 560 551 (8 ) (85 ) (581 ) (401 ) (29 ) 65 Less: realized gains (losses) recorded in interest expense — — 12 92 — — 12 92 Gains (losses) on derivative and hedging activities, net $ 560 $ 551 $ (20 ) $ (177 ) $ (581 ) $ (401 ) $ (41 ) $ (27 ) (1) Recorded in “Gains (losses) on derivative and hedging activities, net” in the consolidated statements of income. (2) Represents ineffectiveness related to cash flow hedges. (3) For fair value and cash flow hedges, recorded in interest expense. For trading derivatives, recorded in “Gains (losses) on derivative and hedging activities, net.”
Collateral Held and Pledged	Collateral held and pledged related to derivative exposures between us and our derivative counterparties are detailed in the following table: (Dollars in millions) June 30, December 31, Collateral held: Cash (obligation to return cash collateral is recorded in short-term borrowings) $ 379 $ 345 Securities at fair value — corporate derivatives (not recorded in financial statements) (1) 136 193 Securities at fair value — on-balance (2) 243 230 Total collateral held $ 758 $ 768 Derivative asset at fair value including accrued interest $ 610 $ 689 Collateral pledged to others: Cash (right to receive return of cash collateral is recorded in investments) $ 283 $ 319 Total collateral pledged $ 283 $ 319 Derivative liability at fair value including accrued interest and premium receivable $ 1,039 $ 1,670 (1) The Company has the ability to sell or re-pledge (2) The trusts do not have the ability to sell or re-pledge

Other Assets (Tables)

Other Assets (Tables)	6 Months Ended
	Jun. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Other Assets	The following table provides the detail of our other assets. (Dollars in millions) June 30, December 31, Accrued interest receivable, net $ 1,821 $ 1,663 Income tax asset, net current and deferred 715 725 Benefit and insurance-related investments 495 488 Derivatives at fair value 432 534 Other loans, net 189 148 Fixed assets, net 152 160 Accounts receivable 109 95 Other 363 380 Total $ 4,276 $ 4,193

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Common Share Repurchases and Issuances	The following table summarizes common share repurchases and issuances. Three Months Ended Six Months Ended 2017 2016 2017 2016 Common shares repurchased (1) 10,936,715 13,579,381 18,300,007 32,789,662 Average purchase price per share $ 15.10 $ 12.90 $ 15.04 $ 11.45 Shares repurchased related to employee stock-based compensation plans (2) 255,875 368,439 1,610,155 1,354,712 Average purchase price per share $ 15.70 $ 13.05 $ 15.58 $ 10.80 Common shares issued (3) 355,802 467,007 3,150,312 2,966,592 (1) Common shares purchased under our share repurchase programs. (2) Comprises shares withheld from stock option exercises and vesting of restricted stock for employees’ tax withholding obligations and shares tendered by employees to satisfy option exercise costs. (3) Common shares issued under our various compensation and benefit plans.

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Schedule of Earnings per Common Share	Basic earnings per common share (“EPS”) are calculated using the weighted average number of shares of common stock outstanding during each period. A reconciliation of the numerators and denominators of the basic and diluted EPS calculations follows. Three Months Ended Six Months Ended (In millions, except per share data) 2017 2016 2017 2016 Numerator: Net income attributable to Navient Corporation $ 112 $ 125 $ 200 $ 305 Denominator: Weighted average shares used to compute basic EPS 280 322 284 331 Effect of dilutive securities: Dilutive effect of stock options, non-vested (1) 5 6 7 4 Dilutive potential common shares (2) 5 6 7 4 Weighted average shares used to compute diluted EPS 285 328 291 335 Basic earnings (loss) per common share attributable to Navient Corporation $ .40 $ .39 $ .70 $ .92 Diluted earnings (loss) per common share attributable to Navient Corporation $ .39 $ .38 $ .69 $ .91 (1) Includes the potential dilutive effect of additional common shares that are issuable upon exercise of outstanding stock options, non-vested (2) For the three months ended June 30, 2017 and 2016, stock options covering approximately 5 million and 5 million shares, respectively, were outstanding but not included in the computation of diluted earnings per share because they were anti-dilutive. For the six months ended June 30, 2017 and 2016, stock options covering approximately 5 million and 5 million shares, respectively, were outstanding but not included in the computation of diluted earnings per share because they were anti-dilutive.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Valuation of Financial Instruments that are Marked-to-Market on Recurring Basis	The following table summarizes the valuation of our financial instruments that are marked-to-market Fair Value Measurements on a Recurring Basis June 30, 2017 December 31, 2016 (Dollars in millions) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Available-for-sale Agency residential mortgage-backed securities $ — $ 1 $ — $ 1 $ — $ 1 $ — $ 1 Other — 2 — 2 — 2 — 2 Total available-for-sale — 3 — 3 — 3 — 3 Derivative instruments: (1) Interest rate swaps — 448 5 453 — 553 12 565 Cross-currency interest rate swaps — — 20 20 — — — — Other — — — — — — — — Total derivative assets (2) — 448 25 473 — 553 12 565 Total $ — $ 451 $ 25 $ 476 $ — $ 556 $ 12 $ 568 Liabilities (3) Derivative instruments (1) Interest rate swaps $ — $ (138 ) $ (53 ) $ (191 ) $ — $ (150 ) $ (58 ) $ (208 ) Floor Income Contracts — (158 ) — (158 ) — (184 ) — (184 ) Cross-currency interest rate swaps — (44 ) (686 ) (730 ) — (53 ) (1,243 ) (1,296 ) Other — — (22 ) (22 ) — — (13 ) (13 ) Total derivative liabilities (2) — (340 ) (761 ) (1,101 ) — (387 ) (1,314 ) (1,701 ) Total $ — $ (340 ) $ (761 ) $ (1,101 ) $ — $ (387 ) $ (1,314 ) $ (1,701 ) (1) Fair value of derivative instruments excludes accrued interest and the value of collateral. (2) See “Note 4—Derivative Financial Instruments” for a reconciliation of gross positions without the impact of master netting agreements to the balance sheet classification. (3) Borrowings which are the hedged items in a fair value hedge relationship and which are adjusted for changes in value due to benchmark interest rates only are not carried at full fair value and are not reflected in this table.
Change in Balance Sheet Carrying Value Associated with Level 3 Financial Instruments Carried at Fair Value on Recurring Basis	The following tables summarize the change in balance sheet carrying value associated with level 3 financial instruments carried at fair value on a recurring basis. Three Months Ended June 30, 2017 2016 Derivative instruments Derivative instruments (Dollars in millions) Interest Cross Other Total Interest Cross Other Total Balance, beginning of period $ (42 ) $ (1,125 ) $ (16 ) $ (1,183 ) $ (32 ) $ (528 ) $ (4 ) $ (564 ) Total gains/(losses) (realized and unrealized): Included in earnings (1) (7 ) 430 (8 ) 415 (5 ) (293 ) (4 ) (302 ) Included in other comprehensive income — — — — — — — — Settlements 1 29 2 32 — 20 1 21 Transfers in and/or out of level 3 — — — — — — — — Balance, end of period $ (48 ) $ (666 ) $ (22 ) $ (736 ) $ (37 ) $ (801 ) $ (7 ) $ (845 ) Change in unrealized gains/(losses) relating to instruments still held at the reporting date (2) $ (6 ) $ 459 $ (6 ) $ 447 $ (4 ) $ (273 ) $ (4 ) $ (281 ) Six Months Ended June 30, 2017 2016 Derivative instruments Derivative instruments (Dollars in millions) Interest Cross Other Total Interest Cross Other Total Balance, beginning of period $ (46 ) $ (1,243 ) $ (13 ) $ (1,302 ) $ (44 ) $ (903 ) $ (2 ) $ (949 ) Total gains/(losses) (realized and unrealized): Included in earnings (1) (5 ) 519 (13 ) 501 6 65 (6 ) 65 Included in other comprehensive income — — — — — — — — Settlements 3 58 4 65 1 37 1 39 Transfers in and/or out of level 3 — — — — — — — — Balance, end of period $ (48 ) $ (666 ) $ (22 ) $ (736 ) $ (37 ) $ (801 ) $ (7 ) $ (845 ) Change in unrealized gains/(losses) relating to instruments still held at the reporting date (2) $ (2 ) $ 516 $ (9 ) $ 505 $ 8 $ 102 $ (6 ) $ 104 (1) “Included in earnings” is comprised of the following amounts recorded in the specified line item in the consolidated statements of income:
Included in Earnings	Three Months Ended Six Months Ended (Dollars in millions) 2017 2016 2017 2016 Gains (losses) on derivative and hedging activities, net $ 444 $ (282 ) $ 559 $ 102 Interest expense (29 ) (20 ) (58 ) (37 ) Total $ 415 $ (302 ) $ 501 $ 65 (2) Recorded in “gains (losses) on derivative and hedging activities, net” in the consolidated statements of income.
Unobservable Data Used in Recurring Valuations of Level 3	The following table presents the significant inputs that are unobservable or from inactive markets used in the recurring valuations of the level 3 financial instruments detailed above. (Dollars in millions) Fair Value at Valuation Input Range Derivatives Prime/LIBOR basis swaps $ (48 ) Discounted cash flow Constant prepayment rate 4.9% Bid/ask adjustment to .05% — .08% discount rate (.08%) Cross-currency interest rate swaps (666 ) Discounted cash flow Constant prepayment rate 3.3% Other (22 ) Total $ (736 )
Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments	The following table summarizes the fair values of our financial assets and liabilities, including derivative financial instruments. June 30, 2017 December 31, 2016 (Dollars in millions) Fair Carrying Difference Fair Carrying Difference Earning assets FFELP Loans $ 85,837 $ 86,140 $ (303 ) $ 86,626 $ 87,730 $ (1,104 ) Private Education Loans 24,569 24,223 346 23,191 23,340 (149 ) Cash and investments (1) 5,057 5,057 — 5,203 5,203 — Total earning assets 115,463 115,420 43 115,020 116,273 (1,253 ) Interest-bearing liabilities Short-term borrowings 3,950 3,918 (32 ) 2,346 2,334 (12 ) Long-term borrowings 109,764 110,778 1,014 109,826 112,368 2,542 Total interest-bearing liabilities 113,714 114,696 982 112,172 114,702 2,530 Derivative financial instruments Floor Income Contracts (158 ) (158 ) — (184 ) (184 ) — Interest rate swaps 262 262 — 357 357 — Cross-currency interest rate swaps (710 ) (710 ) — (1,296 ) (1,296 ) — Other (22 ) (22 ) — (13 ) (13 ) — Excess of net asset fair value over carrying value $ 1,025 $ 1,277 (1) “Cash and investments” includes available-for-sale

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2017
Segment Results and Reconciliations to GAAP	Segment Results and Reconciliations to GAAP Three Months Ended June 30, 2017 (Dollars in millions) FFELP Private Business Other Elimina- (1) Total Adjustments Total Reclassi- Additions/ Total (2) Interest income: Education loans $ 664 $ 386 $ — $ — $ — $ 1,050 $ 18 $ (14 ) $ 4 $ 1,054 Other loans — — — 6 — 6 — — — 6 Cash and investments 7 1 — 2 — 10 — — — 10 Total interest income 671 387 — 8 — 1,066 18 (14 ) 4 1,070 Total interest expense 495 193 — 35 — 723 (1 ) (3 ) (4 ) 719 Net interest income (loss) 176 194 — (27 ) — 343 19 (11 ) 8 351 Less: provisions for loan losses 10 95 — — — 105 — — — 105 Net interest income (loss) after provisions for loan losses 166 99 — (27 ) — 238 19 (11 ) 8 246 Other income (loss): Servicing revenue 13 — 145 — (88 ) 70 — — — 70 Asset recovery and business processing revenue — — 111 — — 111 — — — 111 Other income (loss) — — — 4 — 4 (19 ) (4 ) (23 ) (19 ) Total other income (loss) 13 — 256 4 (88 ) 185 (19 ) (4 ) (23 ) 162 Expenses: Direct operating expenses 90 38 129 6 (88 ) 175 — — — 175 Overhead expenses — — — 55 — 55 — — — 55 Operating expenses 90 38 129 61 (88 ) 230 — — — 230 Goodwill and acquired intangible asset impairment and amortization — — — — — — — 6 6 6 Total expenses 90 38 129 61 (88 ) 230 — 6 6 236 Income (loss) before income tax expense (benefit) 89 61 127 (84 ) — 193 — (21 ) (21 ) 172 Income tax expense (benefit) (3) 32 22 46 (30 ) — 70 — (10 ) (10 ) 60 Net income (loss) $ 57 $ 39 $ 81 $ (54 ) $ — $ 123 $ — $ (11 ) $ (11 ) $ 112 (1) The eliminations in servicing revenue and direct operating expense represent the elimination of intercompany servicing revenue where the Business Services segment performs the loan servicing function for the FFELP Loans segment. (2) “Core Earnings” adjustments to GAAP: Three Months Ended June 30, 2017 (Dollars in millions) Net Impact of Net Impact of Total Net interest income (loss) after provisions for loan losses $ 8 $ — $ 8 Total other income (loss) (23 ) — (23 ) Goodwill and acquired intangible asset impairment and amortization — 6 6 Total “Core Earnings” adjustments to GAAP $ (15 ) $ (6 ) (21 ) Income tax expense (benefit) (10 ) Net income (loss) $ (11 ) (3) Income taxes are based on a percentage of net income before tax for the individual reportable segment. Three Months Ended June 30, 2016 (Dollars in millions) FFELP Private Business Other Elimina- (1) Total Adjustments Total Reclassi- Additions/ Total (2) Interest income: Education loans $ 588 $ 402 $ — $ — $ — $ 990 $ 56 $ (26 ) $ 30 $ 1,020 Other loans — — — 2 — 2 — — — 2 Cash and investments 5 — — 1 — 6 — — — 6 Total interest income 593 402 — 3 — 998 56 (26 ) 30 1,028 Total interest expense 388 173 — 29 — 590 9 — 9 599 Net interest income (loss) 205 229 — (26 ) — 408 47 (26 ) 21 429 Less: provisions for loan losses 10 100 — — — 110 — — — 110 Net interest income (loss) after provisions for loan losses 195 129 — (26 ) — 298 47 (26 ) 21 319 Other income (loss): Servicing revenue 14 3 153 — (99 ) 71 — — — 71 Asset recovery and business processing revenue — — 101 — — 101 — — — 101 Other income (loss) — — — 4 — 4 (47 ) (6 ) (53 ) (49 ) Total other income (loss) 14 3 254 4 (99 ) 176 (47 ) (6 ) (53 ) 123 Expenses: Direct operating expenses 101 41 125 7 (99 ) 175 — — — 175 Overhead expenses — — — 55 — 55 — — — 55 Operating expenses 101 41 125 62 (99 ) 230 — — — 230 Goodwill and acquired intangible asset impairment and amortization — — — — — — — 6 6 6 Total expenses 101 41 125 62 (99 ) 230 — 6 6 236 Income (loss) before income tax expense (benefit) 108 91 129 (84 ) — 244 — (38 ) (38 ) 206 Income tax expense (benefit) (3) 40 34 48 (32 ) — 90 — (9 ) (9 ) 81 Net income (loss) $ 68 $ 57 $ 81 $ (52 ) $ — $ 154 $ — $ (29 ) $ (29 ) $ 125 (1) The eliminations in servicing revenue and direct operating expense represent the elimination of intercompany servicing revenue where the Business Services segment performs the loan servicing function for the FFELP Loans segment. (2) “Core Earnings” adjustments to GAAP: Three Months Ended June 30, 2016 (Dollars in millions) Net Impact of Net Impact of Total Net interest income (loss) after provisions for loan losses $ 21 $ — $ 21 Total other income (loss) (53 ) — (53 ) Goodwill and acquired intangible asset impairment and amortization — 6 6 Total “Core Earnings” adjustments to GAAP $ (32 ) $ (6 ) (38 ) Income tax expense (benefit) (9 ) Net income (loss) $ (29 ) (3) Income taxes are based on a percentage of net income before tax for the individual reportable segment. Six Months Ended June 30, 2017 (Dollars in millions) FFELP Private Business Other Elimina- (1) Total Adjustments Total Reclassi- Additions/ Total (2) Interest income: Education loans $ 1,287 $ 760 $ — $ — $ — $ 2,047 $ 38 $ (27 ) $ 11 $ 2,058 Other loans — — — 10 — 10 — — — 10 Cash and investments 12 1 — 4 — 17 — — — 17 Total interest income 1,299 761 — 14 — 2,074 38 (27 ) 11 2,085 Total interest expense 951 380 — 66 — 1,397 2 (5 ) (3 ) 1,394 Net interest income (loss) 348 381 — (52 ) — 677 36 (22 ) 14 691 Less: provisions for loan losses 20 190 — 2 — 212 — — — 212 Net interest income (loss) after provisions for loan losses 328 191 — (54 ) — 465 36 (22 ) 14 479 Other income (loss): Servicing revenue 26 4 294 — (178 ) 146 — — — 146 Asset recovery and business processing revenue — — 210 — — 210 — — — 210 Other income (loss) — — 2 8 — 10 (36 ) (16 ) (52 ) (42 ) Total other income (loss) 26 4 506 8 (178 ) 366 (36 ) (16 ) (52 ) 314 Expenses: Direct operating expenses 183 78 256 12 (178 ) 351 — — — 351 Overhead expenses — — — 118 — 118 — — — 118 Operating expenses 183 78 256 130 (178 ) 469 — — — 469 Goodwill and acquired intangible asset impairment and amortization — — — — — — — 11 11 11 Total expenses 183 78 256 130 (178 ) 469 — 11 11 480 Income (loss) before income tax expense (benefit) 171 117 250 (176 ) — 362 — (49 ) (49 ) 313 Income tax expense (benefit) (3) 63 43 91 (65 ) — 132 — (19 ) (19 ) 113 Net income (loss) $ 108 $ 74 $ 159 $ (111 ) $ — $ 230 $ — $ (30 ) $ (30 ) $ 200 (1) The eliminations in servicing revenue and direct operating expense represent the elimination of intercompany servicing revenue where the Business Services segment performs the loan servicing function for the FFELP Loans segment. (2) “Core Earnings” adjustments to GAAP: Six Months Ended June 30, 2017 (Dollars in millions) Net Impact of Net Impact of Total Net interest income (loss) after provisions for loan losses $ 14 $ — $ 14 Total other income (loss) (52 ) — (52 ) Goodwill and acquired intangible asset impairment and amortization — 11 11 Total “Core Earnings” adjustments to GAAP $ (38 ) $ (11 ) (49 ) Income tax expense (benefit) (19 ) Net income (loss) $ (30 ) (3) Income taxes are based on a percentage of net income before tax for the individual reportable segment. Six Months Ended June 30, 2016 (Dollars in millions) FFELP Private Business Other Eliminations (1) Total Adjustments Total Reclassi- Additions/ Total (2) Interest income: Education loans $ 1,143 $ 813 $ — $ — $ — $ 1,956 $ 195 $ (86 ) $ 109 $ 2,065 Other loans — — — 3 — 3 — — — 3 Cash and investments 8 1 — 3 — 12 — — — 12 Total interest income 1,151 814 — 6 — 1,971 195 (86 ) 109 2,080 Total interest expense 746 345 — 56 — 1,147 18 — 18 1,165 Net interest income (loss) 405 469 — (50 ) — 824 177 (86 ) 91 915 Less: provisions for loan losses 17 204 — — — 221 — — — 221 Net interest income (loss) after provisions for loan losses 388 265 — (50 ) — 603 177 (86 ) 91 694 Other income (loss): Servicing revenue 31 8 315 — (200 ) 154 — — — 154 Asset recovery and business processing revenue — — 191 — — 191 — — — 191 Other income (loss) — — — 7 — 7 (177 ) 108 (69 ) (62 ) Total other income (loss) 31 8 506 7 (200 ) 352 (177 ) 108 (69 ) 283 Expenses: Direct operating expenses 206 84 258 14 (200 ) 362 — — — 362 Overhead expenses — — — 116 — 116 — — — 116 Operating expenses 206 84 258 130 (200 ) 478 — — — 478 Goodwill and acquired intangible asset impairment and amortization — — — — — — — 10 10 10 Total expenses 206 84 258 130 (200 ) 478 — 10 10 488 Income (loss) before income tax expense (benefit) 213 189 248 (173 ) — 477 — 12 12 489 Income tax expense (benefit) (3) 79 70 91 (64 ) — 176 — 8 8 184 Net income (loss) $ 134 $ 119 $ 157 $ (109 ) $ — $ 301 $ — $ 4 $ 4 $ 305 (1) The eliminations in servicing revenue and direct operating expense represent the elimination of intercompany servicing revenue where the Business Services segment performs the loan servicing function for the FFELP Loans segment. (2) “Core Earnings” adjustments to GAAP: Six Months Ended June 30, 2016 (Dollars in millions) Net Impact of Net Impact of Total Net interest income (loss) after provisions for loan losses $ 91 $ — $ 91 Total other income (loss) (69 ) — (69 ) Goodwill and acquired intangible asset impairment and amortization — 10 10 Total “Core Earnings” adjustments to GAAP $ 22 $ (10 ) 12 Income tax expense (benefit) 8 Net income (loss) $ 4 (3) Income taxes are based on a percentage of net income before tax for the individual reportable segment.
Core Earnings Adjustments to GAAP	Summary of “Core Earnings” Adjustments to GAAP Three Months Ended Six Months Ended (Dollars in millions) 2017 2016 2017 2016 “Core Earnings” adjustments to GAAP: Net impact of derivative accounting (1) $ (15 ) $ (32 ) $ (38 ) $ 22 Net impact of goodwill and acquired intangible assets (2) (6 ) (6 ) (11 ) (10 ) Net tax effect (3) 10 9 19 (8 ) Total “Core Earnings” adjustments to GAAP $ (11 ) $ (29 ) $ (30 ) $ 4 (1) Derivative accounting: mark-to-market (2) Goodwill and acquired intangible assets: (3) Net tax effect:
FFELP Loans Segment [Member]
Asset Information for Loans Segment	The following table includes GAAP basis asset information for our FFELP Loans segment. (Dollars in millions) June 30, December 31, FFELP Loans, net $ 86,140 $ 87,730 Cash and investments (1) 3,088 3,212 Other 1,979 1,907 Total assets $ 91,207 $ 92,849 (1) Includes restricted cash and investments.
Private Education Loans Segment [Member]
Asset Information for Loans Segment	The following table includes GAAP basis asset information for our Private Education Loans segment. (Dollars in millions) June 30, December 31, Private Education Loans, net $ 24,223 $ 23,340 Cash and investments (1) 737 667 Other 1,513 1,567 Total assets $ 26,473 $ 25,574 (1) Includes restricted cash and investments.

Significant Accounting Polici28

Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 01, 2017	Dec. 31, 2016	Jun. 30, 2016
Summary Of Significant Accounting Policies [Line Items]
Loans purchased, Unpaid principal amount			$ 6,500,000,000
FFELP Loans [Member]
Summary Of Significant Accounting Policies [Line Items]
Loans purchased, Unpaid principal amount			3,500,000,000
Loans receivable, Fair Value	$ 85,837,000,000	$ 85,837,000,000		$ 86,626,000,000
Uncollected contractual principal and interest payments	70,095,000,000	70,095,000,000			$ 71,991,000,000
Loans receivable, discount	47,000,000	47,000,000	47,000,000
Allowance for loans acquired	0	0
FFELP Loans [Member] | Loans Acquired With Non-Deteriorated Credit Quality [Member]
Summary Of Significant Accounting Policies [Line Items]
Loans receivable, principal amount			3,500,000,000
Private Education Loans [Member]
Summary Of Significant Accounting Policies [Line Items]
Loans purchased, Unpaid principal amount			3,000,000,000
Loans receivable, Fair Value	24,569,000,000	24,569,000,000		$ 23,191,000,000
Uncollected contractual principal and interest payments	23,613,000,000	23,613,000,000			$ 23,265,000,000
Estimated accretable yield			108,000,000
Valuation allowance	0	0
Loans receivable, discount	419,000,000	419,000,000	424,000,000
Allowance for loans acquired	$ 0	0
Private Education Loans [Member] | Loans With Deteriorated Credit Quality [Member]
Summary Of Significant Accounting Policies [Line Items]
Loans receivable, principal amount			261,000,000
Loans receivable, Fair Value			101,000,000
Uncollected contractual principal and interest payments			411,000,000
Private Education Loans [Member] | Loans Acquired With Non-Deteriorated Credit Quality [Member]
Summary Of Significant Accounting Policies [Line Items]
Loans receivable, principal amount			$ 2,800,000,000
Adjustments for New Accounting Pronouncement [Member]
Summary Of Significant Accounting Policies [Line Items]
Reduction to income tax expense		$ 5,000,000

Allowance for Loan Losses - Add

Allowance for Loan Losses - Additional Information (Detail) $ in Billions	6 Months Ended	12 Months Ended
	Jun. 30, 2017USD ($)PointLoans	Dec. 31, 2016USD ($)	Jun. 01, 2017USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans purchased, Unpaid principal amount			$ 6.5
Percentage of loans granted forbearance that migrated to TDR classification	59.00%	61.00%
Payment default period for TDRs	60 days past due
Interest Rate Reduction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR loans, Unpaid Principal Balance	$ 2.6	$ 2.6
FFELP Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans purchased, Unpaid principal amount			3.5
Maximum [Member] | FICO Score, 600 to 699 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Original FICO score at for-profit schools to become eligible for non-traditional loans | Point	670
Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Delinquency period (in days)	212 days
Minimum [Member] | FICO Score, 600 to 699 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Original FICO score at for-profit schools to become eligible for non-traditional loans | Point	640
Private Education Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans purchased, Unpaid principal amount			$ 3
Number of classes of loans | Loans	2

Allowance for Loan Losses - All

Allowance for Loan Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)SecurityLoan	Jun. 30, 2016USD ($)SecurityLoan	Jun. 30, 2017USD ($)SecurityLoan	Jun. 30, 2016USD ($)SecurityLoan	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)
Allowance for Loan Losses
Beginning balance	$ 1,391	$ 1,518	$ 1,433	$ 1,564
Total provision	105	110	212	221
Charge-offs	(136)	(140)	(287)	(300)
Reclassification of interest reserve	2	3	4	6
Ending total allowance	1,362	1,491	1,362	1,491
Allowance Ending Balance:
Individually evaluated for impairment	1,163	1,174	1,163	1,174
Collectively evaluated for impairment		317		317
Collectively evaluated for impairment:
Excluding Purchased Non-Credit Impaired Loans and Purchased Credit Impaired Loans					$ 199
Purchased Non-Credit Impaired Loans					0
Purchased Credit Impaired Loans					0
Ending total allowance	1,362	1,491	1,362	1,491
Loans Ending Balance:
Individually evaluated for impairment	11,051	11,195	11,051	11,195
Individually evaluated for impairment	11,051	11,195	11,051	11,195	11,051	$ 11,195
Ending balance: collectively evaluated for impairment		107,150		107,150
Collectively evaluated for impairment:
Excluding Purchased Non-Credit Impaired Loans and Purchased Credit Impaired Loans					94,625
Purchased Non-Credit Impaired Loans					6,218
Purchased Credit Impaired Loans					261
Ending total loans					112,155	118,345
Ending total loans					112,155	118,345
FFELP Loans [Member]
Allowance for Loan Losses
Beginning balance	64	69	67	78
Total provision	10	10	20	17
Charge-offs	(13)	(13)	(26)	(29)
Ending total allowance	61	66	61	66
Allowance Ending Balance:
Collectively evaluated for impairment		66		66
Collectively evaluated for impairment:
Excluding Purchased Non-Credit Impaired Loans and Purchased Credit Impaired Loans					61
Purchased Non-Credit Impaired Loans					0
Purchased Credit Impaired Loans					0
Ending total allowance	$ 61	66	$ 61	66
Loans Ending Balance:
Ending balance: collectively evaluated for impairment		$ 91,625		$ 91,625
Collectively evaluated for impairment:
Excluding Purchased Non-Credit Impaired Loans and Purchased Credit Impaired Loans					81,984
Purchased Non-Credit Impaired Loans					3,463
Ending total loans					85,447	91,625
Charge-offs as a percentage of average loans in repayment (annualized)	0.08%	0.07%	0.08%	0.08%
Allowance coverage of charge-offs (annualized) | SecurityLoan	1.1	1.2	1.2	1.1
Allowance as a percentage of the ending total loan balance	0.07%	0.07%	0.07%	0.07%
Allowance as a percentage of the ending loans in repayment	0.09%	0.09%	0.09%	0.09%
Ending total loans					85,447	91,625
Average loans in repayment	$ 68,915	$ 72,980	$ 69,108	$ 73,339
Ending loans in repayment					70,095	71,991
Private Education Loans [Member]
Allowance for Loan Losses
Beginning balance	1,311	1,434	1,351	1,471
Total provision	95	100	190	204
Charge-offs	(122)	(127)	(259)	(271)
Reclassification of interest reserve	2	3	4	6
Ending total allowance	1,286	1,410	1,286	1,410
Allowance Ending Balance:
Individually evaluated for impairment	1,153	1,163	1,153	1,163
Collectively evaluated for impairment		247		247
Collectively evaluated for impairment:
Excluding Purchased Non-Credit Impaired Loans and Purchased Credit Impaired Loans					133
Purchased Non-Credit Impaired Loans					0
Purchased Credit Impaired Loans					0
Ending total allowance	1,286	1,410	1,286	1,410
Loans Ending Balance:
Individually evaluated for impairment	11,020	11,162	11,020	11,162
Individually evaluated for impairment	$ 11,020	11,162	$ 11,020	11,162	11,020	11,162
Ending balance: collectively evaluated for impairment		$ 15,478		$ 15,478
Collectively evaluated for impairment:
Excluding Purchased Non-Credit Impaired Loans and Purchased Credit Impaired Loans					12,467
Purchased Non-Credit Impaired Loans					2,755
Purchased Credit Impaired Loans					261
Ending total loans					26,503	26,640
Charge-offs as a percentage of average loans in repayment (annualized)	2.25%	2.17%	2.40%	2.28%
Allowance coverage of charge-offs (annualized) | SecurityLoan	2.6	2.8	2.5	2.6
Allowance as a percentage of the ending total loan balance	4.85%	5.29%	4.85%	5.29%
Allowance as a percentage of the ending loans in repayment	5.45%	6.06%	5.45%	6.06%
Ending total loans					26,503	26,640
Average loans in repayment	$ 21,621	$ 23,561	$ 21,706	$ 23,871
Ending loans in repayment					23,613	23,265
Other Loans [Member]
Allowance for Loan Losses
Beginning balance	16	15	15	15
Total provision			2
Charge-offs	(1)		(2)
Ending total allowance	15	15	15	15
Allowance Ending Balance:
Individually evaluated for impairment	10	11	10	11
Collectively evaluated for impairment		4		4
Collectively evaluated for impairment:
Excluding Purchased Non-Credit Impaired Loans and Purchased Credit Impaired Loans					5
Purchased Non-Credit Impaired Loans					0
Purchased Credit Impaired Loans					0
Ending total allowance	15	15	15	15
Loans Ending Balance:
Individually evaluated for impairment	31	33	31	33
Individually evaluated for impairment	$ 31	33	$ 31	33	31	33
Ending balance: collectively evaluated for impairment		$ 47		$ 47
Collectively evaluated for impairment:
Excluding Purchased Non-Credit Impaired Loans and Purchased Credit Impaired Loans					174
Ending total loans					205	80
Charge-offs as a percentage of average loans in repayment (annualized)	2.37%	1.32%	2.22%	1.69%
Allowance coverage of charge-offs (annualized) | SecurityLoan	3.3	13.5	3.7	10.4
Allowance as a percentage of the ending total loan balance	7.49%	18.18%	7.49%	18.18%
Allowance as a percentage of the ending loans in repayment	7.49%	18.18%	7.49%	18.18%
Ending total loans					205	80
Average loans in repayment	$ 197	$ 82	$ 185	$ 83
Ending loans in repayment					$ 205	$ 80

Allowance for Loan Losses - A31

Allowance for Loan Losses - Allowance for Credit Losses and Recorded Investments in Loans (Parenthetical) (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 01, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans purchased, Unpaid principal amount					$ 6,500,000,000
FFELP Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans purchased, Unpaid principal amount					3,500,000,000
Allowance for loans acquired	$ 0		$ 0
Loans receivable, discount	$ 47,000,000		$ 47,000,000		47,000,000
Allowance as a percentage of the ending total loan balance	0.07%	0.07%	0.07%	0.07%
Allowance as a percentage of the ending loans in repayment	0.09%	0.09%	0.09%	0.09%
FFELP Loans [Member] | Loans Receivable Excluding Recent Loans Acquired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance as a percentage of the ending total loan balance	0.07%		0.07%
Allowance as a percentage of the ending loans in repayment	0.09%		0.09%
Private Education Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans purchased, Unpaid principal amount					3,000,000,000
Allowance for loans acquired	$ 0		$ 0
Loans receivable, discount	$ 419,000,000		$ 419,000,000		$ 424,000,000
Allowance as a percentage of the ending total loan balance	4.85%	5.29%	4.85%	5.29%
Allowance as a percentage of the ending loans in repayment	5.45%	6.06%	5.45%	6.06%
Private Education Loans [Member] | Loans Receivable Excluding Recent Loans Acquired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance as a percentage of the ending total loan balance	5.48%		5.48%
Allowance as a percentage of the ending loans in repayment	6.20%		6.20%

Allowance for Loan Losses - Pri

Allowance for Loan Losses - Private Education Loan Portfolio Stratified by Key Credit Quality Indicators (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Private Education Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators	$ 25,719	$ 24,333
School Type/FICO Scores [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators	$ 25,719	$ 24,333
School Type/FICO Scores [Member] | Private Education Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators, Percent	100.00%	100.00%
School Type/FICO Scores [Member] | Private Education Loans [Member] | Traditional Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators	$ 23,583	$ 22,367
Total Private Education Loans Credit Quality Indicators, Percent	92.00%	92.00%
School Type/FICO Scores [Member] | Private Education Loans [Member] | Non Traditional Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators	$ 2,136	$ 1,966
Total Private Education Loans Credit Quality Indicators, Percent	8.00%	8.00%
Cosigners [Member] | Private Education Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators, Percent	100.00%	100.00%
Cosigners [Member] | Private Education Loans [Member] | Cosigner Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators	$ 16,714	$ 15,610
Total Private Education Loans Credit Quality Indicators, Percent	65.00%	64.00%
Cosigners [Member] | Private Education Loans [Member] | Non Cosigner Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators	$ 9,005	$ 8,723
Total Private Education Loans Credit Quality Indicators, Percent	35.00%	36.00%
Seasoning [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators	$ 25,719	$ 24,333
Seasoning [Member] | Private Education Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators, Percent	100.00%	100.00%
Seasoning [Member] | Private Education Loans [Member] | 1-12 Payments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators	$ 1,402	$ 1,340
Total Private Education Loans Credit Quality Indicators, Percent	5.00%	5.00%
Seasoning [Member] | Private Education Loans [Member] | 13-24 Payments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators	$ 1,152	$ 1,271
Total Private Education Loans Credit Quality Indicators, Percent	5.00%	5.00%
Seasoning [Member] | Private Education Loans [Member] | 25-36 Payments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators	$ 1,723	$ 1,908
Total Private Education Loans Credit Quality Indicators, Percent	7.00%	8.00%
Seasoning [Member] | Private Education Loans [Member] | 37-48 Payments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators	$ 2,673	$ 2,723
Total Private Education Loans Credit Quality Indicators, Percent	10.00%	11.00%
Seasoning [Member] | Private Education Loans [Member] | More than 48 Payments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators	$ 17,533	$ 15,698
Total Private Education Loans Credit Quality Indicators, Percent	68.00%	65.00%
Seasoning [Member] | Private Education Loans [Member] | Not Yet in Repayment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Private Education Loans Credit Quality Indicators	$ 1,236	$ 1,393
Total Private Education Loans Credit Quality Indicators, Percent	5.00%	6.00%

Allowance for Loan Losses - Age

Allowance for Loan Losses - Age Analysis of Past Due Loans Delinquencies (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Loans in repayment and percentage of each status:
Loans allowance for losses	$ (1,362)	$ (1,433)	$ (1,391)	$ (1,491)	$ (1,518)	$ (1,564)
FFELP Loans [Member]
Loans in repayment and percentage of each status:
Total loans in repayment	70,095			71,991
Loans allowance for losses	(61)	(67)	$ (64)	$ (66)	$ (69)	$ (78)
Loans, net	86,140	87,730
Credit Concentration Risk [Member] | Private Education Loans - Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, gross	23,583	22,367
Loans in repayment and percentage of each status:
Loans current	20,496	19,020
Total loans in repayment	21,690	20,396
Total loans, gross	23,583	22,367
Loans unamortized premium (discount)	(884)	(402)
Total loans	22,699	21,965
Loans receivable for partially charged-off loans	509	526
Loans allowance for losses	(1,083)	(1,138)
Loans, net	22,125	21,353
Credit Concentration Risk [Member] | Private Education Loans - Non-Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, gross	2,136	1,966
Loans in repayment and percentage of each status:
Total loans in repayment	1,923	1,754
Total loans, gross	2,136	1,966
Loans unamortized premium (discount)	(110)	(55)
Total loans	2,026	1,911
Loans receivable for partially charged-off loans	275	289
Loans allowance for losses	(203)	(213)
Loans, net	2,098	1,987
Credit Concentration Risk [Member] | Troubled Debt Restructuring Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, gross	10,645	10,805
Loans in repayment and percentage of each status:
Total loans in repayment	9,512	9,638
Total loans, gross	10,645	10,805
Credit Concentration Risk [Member] | School/Grace/Deferment [Member] | Private Education Loans - Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, gross	1,122	1,271
Loans in repayment and percentage of each status:
Total loans, gross	1,122	1,271
Credit Concentration Risk [Member] | School/Grace/Deferment [Member] | Private Education Loans - Non-Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, gross	114	122
Loans in repayment and percentage of each status:
Total loans, gross	114	122
Credit Concentration Risk [Member] | School/Grace/Deferment [Member] | Troubled Debt Restructuring Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, gross	509	579
Loans in repayment and percentage of each status:
Total loans, gross	509	579
Credit Concentration Risk [Member] | Forbearance [Member] | Private Education Loans - Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, gross	771	700
Loans in repayment and percentage of each status:
Total loans, gross	771	700
Credit Concentration Risk [Member] | Forbearance [Member] | Private Education Loans - Non-Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, gross	99	90
Loans in repayment and percentage of each status:
Total loans, gross	99	90
Credit Concentration Risk [Member] | Forbearance [Member] | Troubled Debt Restructuring Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, gross	624	588
Loans in repayment and percentage of each status:
Total loans, gross	624	588
Credit Concentration Risk [Member] | Financing Receivables, Current [Member] | Private Education Loans - Non-Traditional [Member]
Loans in repayment and percentage of each status:
Loans current	1,691	1,486
Credit Concentration Risk [Member] | Financing Receivables, Current [Member] | Troubled Debt Restructuring Loans [Member]
Loans in repayment and percentage of each status:
Loans current	8,367	8,273
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	413	444
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	68	78
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	355	412
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	240	269
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	47	52
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	223	267
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	541	663
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	117	138
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	567	686
Credit Concentration Risk [Member] | FFELP Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, gross	85,447	86,918
Loans in repayment and percentage of each status:
Loans current	61,108	61,977
Total loans in repayment	70,095	70,557
Total loans, gross	85,447	86,918
Loans unamortized premium (discount)	754	879
Total loans	86,201	87,797
Loans allowance for losses	(61)	(67)
Loans, net	86,140	87,730
Credit Concentration Risk [Member] | FFELP Loans [Member] | School/Grace/Deferment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, gross	5,538	5,871
Loans in repayment and percentage of each status:
Total loans, gross	5,538	5,871
Credit Concentration Risk [Member] | FFELP Loans [Member] | Forbearance [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, gross	9,814	10,490
Loans in repayment and percentage of each status:
Total loans, gross	9,814	10,490
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	3,187	2,820
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	1,596	1,325
Credit Concentration Risk [Member] | FFELP Loans [Member] | Financing Receivables, 90 Days Past Due [Member]
Loans in repayment and percentage of each status:
Loans delinquent	$ 4,204	$ 4,435
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Private Education Loans - Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	100.00%	100.00%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Private Education Loans - Non-Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	100.00%	100.00%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Troubled Debt Restructuring Loans [Member]
Financing Receivable, Recorded Investment, Past Due [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]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	94.50%	93.30%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Financing Receivables, Current [Member] | Private Education Loans - Non-Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	87.90%	84.80%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Financing Receivables, Current [Member] | Troubled Debt Restructuring Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	88.00%	85.80%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] | Private Education Loans - Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [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]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans delinquent, percentage	3.60%	4.50%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] | Troubled Debt Restructuring Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans delinquent, percentage	3.70%	4.30%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] | Private Education Loans - Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [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]
Financing Receivable, Recorded Investment, Past Due [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]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans delinquent, percentage	2.30%	2.80%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Financing Receivables, 90 Days Past Due [Member] | Private Education Loans - Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans delinquent, percentage	2.50%	3.20%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Financing Receivables, 90 Days Past Due [Member] | Private Education Loans - Non-Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans delinquent, percentage	6.10%	7.80%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Financing Receivables, 90 Days Past Due [Member] | Troubled Debt Restructuring Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans delinquent, percentage	6.00%	7.10%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Financing Receivables, Loans In Repayment [Member] | Private Education Loans - Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	92.00%	91.20%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Financing Receivables, Loans In Repayment [Member] | Private Education Loans - Non-Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	90.00%	89.20%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Financing Receivables, Delinquent Loans in Repayment [Member] | Private Education Loans - Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	5.50%	6.70%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Financing Receivables, Delinquent Loans in Repayment [Member] | Private Education Loans - Non-Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	12.10%	15.20%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Financing Receivables, Forbearance, Loans In Repayment [Member] | Private Education Loans - Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	3.40%	3.30%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Financing Receivables, Forbearance, Loans In Repayment [Member] | Private Education Loans - Non-Traditional [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	4.90%	4.90%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | FFELP Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	100.00%	100.00%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | FFELP Loans [Member] | Financing Receivables, Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	87.20%	87.80%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | FFELP Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans delinquent, percentage	4.50%	4.00%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | FFELP Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans delinquent, percentage	2.30%	1.90%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | FFELP Loans [Member] | Financing Receivables, 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans delinquent, percentage	6.00%	6.30%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | FFELP Loans [Member] | Financing Receivables, Loans In Repayment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	82.00%	81.20%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | FFELP Loans [Member] | Financing Receivables, Delinquent Loans in Repayment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	12.80%	12.20%
Credit Concentration Risk [Member] | Accounts Receivable [Member] | FFELP Loans [Member] | Financing Receivables, Forbearance, Loans In Repayment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Dimensions of concentration risk	12.30%	12.90%

Allowance for Loan Losses - Rec

Allowance for Loan Losses - Receivable for Partially Charged-Off Private Education Loans (Detail) - Private Education Loans [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Receivable at beginning of period			$ 23,340
Receivable at end of period	$ 24,223		24,223
Loans Receivable For Partially Charged Off Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Receivable at beginning of period	800	$ 867	815	$ 881
Expected future recoveries of current period defaults	29	32	63	68
Recoveries	(40)	(49)	(84)	(95)
Charge-offs	(5)	(3)	(10)	(7)
Receivable at end of period	$ 784	$ 847	$ 784	$ 847

Allowance for Loan Losses - R35

Allowance for Loan Losses - Recorded Investment, Unpaid Principal Balance and Related Allowance for TDR Loans (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
TDR Loans, Recorded Investment	$ 10,594	$ 10,759
TDR loans, Unpaid Principal Balance	10,645	10,805
TDR Loans, Related Allowance	1,153	1,190
Private Education Loans - Traditional [Member]
Financing Receivable, Impaired [Line Items]
TDR Loans, Recorded Investment	9,277	9,386
TDR loans, Unpaid Principal Balance	9,322	9,429
TDR Loans, Related Allowance	973	1,003
Private Education Loans - Non-Traditional [Member]
Financing Receivable, Impaired [Line Items]
TDR Loans, Recorded Investment	1,317	1,373
TDR loans, Unpaid Principal Balance	1,323	1,376
TDR Loans, Related Allowance	$ 180	$ 187

Allowance for Loan Losses - Ave

Allowance for Loan Losses - Average Recorded Investment and Interest Income Recognized for TDR (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, Average Recorded Investment	$ 10,640	$ 10,738	$ 10,683	$ 10,696
Impaired financing receivable, Interest Income Recognized	176	165	348	330
Private Education Loans - Traditional [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, Average Recorded Investment	9,307	9,320	9,337	9,271
Impaired financing receivable, Interest Income Recognized	149	138	295	276
Private Education Loans - Non-Traditional [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, Average Recorded Investment	1,333	1,418	1,346	1,425
Impaired financing receivable, Interest Income Recognized	$ 27	$ 27	$ 53	$ 54

Allowance for Loan Losses - Loa

Allowance for Loan Losses - Loans Modified Accounts for TDR (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Modifications [Line Items]
Modified Loans	$ 203	$ 311	$ 418	$ 680
Charge-Offs	94	94	200	196
Payment-Default	47	66	101	139
Private Education Loans - Traditional [Member]
Financing Receivable, Modifications [Line Items]
Modified Loans	189	286	388	628
Charge-Offs	74	74	160	154
Payment-Default	41	56	88	118
Private Education Loans - Non-Traditional [Member]
Financing Receivable, Modifications [Line Items]
Modified Loans	14	25	30	52
Charge-Offs	20	20	40	42
Payment-Default	$ 6	$ 10	$ 13	$ 21

Allowance for Loan Losses - Acc

Allowance for Loan Losses - Accrued Interest Receivable (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued Interest Receivable	$ 1,821	$ 1,663
Private Education Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued Interest Receivable	390	391
Accrued Interest Receivable, Allowance for Uncollectible Interest	26	30
Private Education Loans [Member] | Traditional Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued Interest Receivable	341	344
Accrued Interest Receivable, Allowance for Uncollectible Interest	20	23
Private Education Loans [Member] | Non Traditional Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued Interest Receivable	49	47
Accrued Interest Receivable, Allowance for Uncollectible Interest	6	7
Accrued Interest Receivable, Greater Than 90 Days Past Due [Member] | Private Education Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued Interest Receivable	26	33
Accrued Interest Receivable, Greater Than 90 Days Past Due [Member] | Private Education Loans [Member] | Traditional Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued Interest Receivable	20	26
Accrued Interest Receivable, Greater Than 90 Days Past Due [Member] | Private Education Loans [Member] | Non Traditional Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued Interest Receivable	$ 6	$ 7

Borrowings - Company's Borrowin

Borrowings - Company's Borrowings (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Short-term borrowings	$ 3,918	$ 2,334
Long-term borrowings	110,778	112,368
Total	114,696	114,702
Total Before Hedge Accounting Adjustments [Member]
Debt Instrument [Line Items]
Short-term borrowings	3,867	2,335
Long-term borrowings	110,991	113,119
Total	114,858	115,454
Total Before Hedge Accounting Adjustments [Member] | Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Short-term borrowings	1,937	717
Long-term borrowings	12,358	13,029
Total	14,295	13,746
Total Before Hedge Accounting Adjustments [Member] | Total Unsecured Borrowings [Member]
Debt Instrument [Line Items]
Short-term borrowings	1,937	717
Long-term borrowings	12,358	13,029
Total	14,295	13,746
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan Securitizations [Member]
Debt Instrument [Line Items]
Long-term borrowings	73,025	73,522
Total	73,025	73,522
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan Securitizations [Member]
Debt Instrument [Line Items]
Short-term borrowings	685	548
Long-term borrowings	13,000	14,125
Total	13,685	14,673
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan - Other Facilities [Member]
Debt Instrument [Line Items]
Long-term borrowings	10,729	12,443
Total	10,729	12,443
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan - Other Facilities [Member]
Debt Instrument [Line Items]
Short-term borrowings	613	464
Long-term borrowings	1,879
Total	2,492	464
Total Before Hedge Accounting Adjustments [Member] | Other [Member]
Debt Instrument [Line Items]
Short-term borrowings	632	606
Total	632	606
Total Before Hedge Accounting Adjustments [Member] | Secured Borrowings [Member]
Debt Instrument [Line Items]
Short-term borrowings	1,930	1,618
Long-term borrowings	98,633	100,090
Total	100,563	101,708
Hedge Accounting Adjustments [Member]
Debt Instrument [Line Items]
Short-term borrowings	51	(1)
Long-term borrowings	(213)	(751)
Total	$ (162)	$ (752)

Borrowings - Company's Borrow40

Borrowings - Company's Borrowings (Parenthetical) (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 110,778	$ 112,368
Short-term Debt	3,918	2,334
Total Before Hedge Accounting Adjustments [Member]
Debt Instrument [Line Items]
Long-term debt	110,991	113,119
Short-term Debt	3,867	2,335
Other [Member] | Total Before Hedge Accounting Adjustments [Member]
Debt Instrument [Line Items]
Short-term Debt	632	606
Private Education Loan Securitizations Repurchase Facilities [Member] | Total Before Hedge Accounting Adjustments [Member]
Debt Instrument [Line Items]
Long-term debt	957	475
Short-term Debt	685	548
Maturity Overnight [Member] | Other [Member] | Total Before Hedge Accounting Adjustments [Member]
Debt Instrument [Line Items]
Securities re-pledged subject to an overnight repurchase transaction	$ 139	$ 193

Borrowings - Financing VIEs (De

Borrowings - Financing VIEs (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Securities Financing Transaction [Line Items]
Short-term borrowings	$ 3,918	$ 2,334
Long-term borrowings	110,778	112,368
Total Debt Outstanding	114,696	114,702
Total Before Hedge Accounting Adjustments [Member]
Securities Financing Transaction [Line Items]
Short-term borrowings	3,867	2,335
Long-term borrowings	110,991	113,119
Total Debt Outstanding	114,858	115,454
Hedge Accounting Adjustments [Member]
Securities Financing Transaction [Line Items]
Short-term borrowings	51	(1)
Long-term borrowings	(213)	(751)
Total Debt Outstanding	(162)	(752)
Assets and Liabilities of Consolidated Variable Interest Entities [Member]
Securities Financing Transaction [Line Items]
Short-term borrowings	1,410	1,078
Long-term borrowings	94,995	95,492
Total Debt Outstanding	96,405	96,570
Loans	103,316	104,008
Cash	3,433	3,434
Other assets, Net	611	(11)
Total Carrying Amount of Assets Securing Debt Outstanding	107,360	107,431
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan Securitizations [Member]
Securities Financing Transaction [Line Items]
Long-term borrowings	73,025	73,522
Total Debt Outstanding	73,025	73,522
Loans	73,795	74,197
Cash	2,659	2,676
Other assets, Net	868	778
Total Carrying Amount of Assets Securing Debt Outstanding	77,322	77,651
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan Securitizations [Member]
Securities Financing Transaction [Line Items]
Short-term borrowings	685	548
Long-term borrowings	13,000	14,125
Total Debt Outstanding	13,685	14,673
Loans	18,275	19,815
Cash	500	455
Other assets, Net	232	260
Total Carrying Amount of Assets Securing Debt Outstanding	19,007	20,530
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan - Other Facilities [Member]
Securities Financing Transaction [Line Items]
Long-term borrowings	7,689	9,046
Total Debt Outstanding	7,689	9,046
Loans	7,856	9,232
Cash	210	289
Other assets, Net	163	172
Total Carrying Amount of Assets Securing Debt Outstanding	8,229	9,693
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan - Other Facilities [Member]
Securities Financing Transaction [Line Items]
Short-term borrowings	613	464
Long-term borrowings	1,879
Total Debt Outstanding	2,492	464
Loans	3,255	685
Cash	58	10
Other assets, Net	45	14
Total Carrying Amount of Assets Securing Debt Outstanding	3,358	709
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Total Before Hedge Accounting Adjustments [Member]
Securities Financing Transaction [Line Items]
Short-term borrowings	1,410	1,078
Long-term borrowings	95,593	96,693
Total Debt Outstanding	97,003	97,771
Loans	103,316	104,008
Cash	3,433	3,434
Other assets, Net	1,308	1,224
Total Carrying Amount of Assets Securing Debt Outstanding	108,057	108,666
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Hedge Accounting Adjustments [Member]
Securities Financing Transaction [Line Items]
Long-term borrowings	(598)	(1,201)
Total Debt Outstanding	(598)	(1,201)
Other assets, Net	(697)	(1,235)
Total Carrying Amount of Assets Securing Debt Outstanding	(697)	(1,235)
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Other [Member]
Securities Financing Transaction [Line Items]
Short-term borrowings	112	66
Total Debt Outstanding	112	66
Loans	135	79
Cash	6	4
Total Carrying Amount of Assets Securing Debt Outstanding	$ 141	$ 83

Borrowings - Financing VIEs (Pa

Borrowings - Financing VIEs (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Securities Financing Transaction [Line Items]
Long-term debt	$ 110,778	$ 112,368
Short-term Debt	3,918	2,334
Assets and Liabilities of Consolidated Variable Interest Entities [Member]
Securities Financing Transaction [Line Items]
Long-term debt	94,995	95,492
Short-term Debt	1,410	1,078
Restricted cash	3,433	3,434
Private Education Loan Securitizations Repurchase Facilities [Member] | Assets and Liabilities of Consolidated Variable Interest Entities [Member]
Securities Financing Transaction [Line Items]
Long-term debt	964	475
Short-term Debt	687	548
Restricted cash	$ 52	$ 49

Derivative Financial Instrume43

Derivative Financial Instruments - Impact of Derivatives on Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Derivative Assets:
Derivative assets	$ 473	$ 565
Derivative Liabilities:
Derivative liabilities	(1,101)	(1,701)
Net total derivatives	(628)	(1,136)
Interest Rate Swaps [Member]
Derivative Assets:
Derivative assets	453	565
Derivative Liabilities:
Derivative liabilities	(191)	(208)
Cross-Currency Interest Rate Swaps [Member]
Derivative Assets:
Derivative assets	20
Derivative Liabilities:
Derivative liabilities	(730)	(1,296)
Other [Member]
Derivative Liabilities:
Derivative liabilities	(22)	(13)
Floor Income Contracts [Member]
Derivative Liabilities:
Derivative liabilities	(158)	(184)
Designated as Hedging Instrument [Member] | Cash Flow [Member]
Derivative Assets:
Derivative assets	47	78
Derivative Liabilities:
Derivative liabilities	(57)	(76)
Net total derivatives	(10)	2
Designated as Hedging Instrument [Member] | Fair Value [Member]
Derivative Assets:
Derivative assets	416	465
Derivative Liabilities:
Derivative liabilities	(746)	(1,305)
Net total derivatives	(330)	(840)
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Cash Flow [Member]
Derivative Assets:
Derivative assets	47	78
Derivative Liabilities:
Derivative liabilities	(57)	(76)
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Fair Value [Member]
Derivative Assets:
Derivative assets	396	465
Derivative Liabilities:
Derivative liabilities	(60)	(62)
Designated as Hedging Instrument [Member] | Cross-Currency Interest Rate Swaps [Member] | Fair Value [Member]
Derivative Assets:
Derivative assets	20
Derivative Liabilities:
Derivative liabilities	(686)	(1,243)
Trading [Member]
Derivative Assets:
Derivative assets	10	22
Derivative Liabilities:
Derivative liabilities	(298)	(320)
Net total derivatives	(288)	(298)
Trading [Member] | Interest Rate Swaps [Member]
Derivative Assets:
Derivative assets	10	22
Derivative Liabilities:
Derivative liabilities	(74)	(70)
Trading [Member] | Cross-Currency Interest Rate Swaps [Member]
Derivative Liabilities:
Derivative liabilities	(44)	(53)
Trading [Member] | Other [Member]
Derivative Liabilities:
Derivative liabilities	(22)	(13)
Trading [Member] | Floor Income Contracts [Member]
Derivative Liabilities:
Derivative liabilities	$ (158)	$ (184)

Derivative Financial Instrume44

Derivative Financial Instruments - Gross Positions without Impact of Master Netting Agreements (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Gross position, Assets	$ 473	$ 565
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets	432	534
Cash collateral (held) pledged, Assets	(379)	(345)
Gross position, Liabilities	(1,101)	(1,701)
Cash collateral (held) pledged, Liabilities	283	319
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross position, Liabilities	(1,101)	(1,701)
Impact of master netting agreements, Liabilities	41	31
Derivative values with impact of master netting agreements (as carried on balance sheet), Liabilities	(1,060)	(1,670)
Cash collateral (held) pledged, Liabilities	283	319
Net position, Liabilities	(777)	(1,351)
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Gross position, Assets	473	565
Impact of master netting agreements, Assets	(41)	(31)
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets	432	534
Cash collateral (held) pledged, Assets	(379)	(345)
Net position, Assets	$ 53	$ 189

Derivative Financial Instrume45

Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Decrease in valuation due to net credit risk adjustments	$ 4	$ 0
Decrease in valuation due to liquidity adjustments	36	31
Derivative liability at fair value including accrued interest and premium receivable	1,039	$ 1,670
Counterparty [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability at fair value including accrued interest and premium receivable	$ 305

Derivative Financial Instrume46

Derivative Financial Instruments - Derivative Notional Values (Detail) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Total Derivative Notional Values	$ 112,000,000,000	$ 80,700,000,000
Interest Rate Swaps [Member]
Derivative [Line Items]
Total Derivative Notional Values	80,100,000,000	50,800,000,000
Floor Income Contracts [Member]
Derivative [Line Items]
Total Derivative Notional Values	21,900,000,000	18,500,000,000
Cross-Currency Interest Rate Swaps [Member]
Derivative [Line Items]
Total Derivative Notional Values	7,700,000,000	8,800,000,000
Other [Member]
Derivative [Line Items]
Total Derivative Notional Values	2,300,000,000	2,600,000,000
Designated as Hedging Instrument [Member] | Cash Flow [Member]
Derivative [Line Items]
Total Derivative Notional Values	20,000,000,000	15,200,000,000
Designated as Hedging Instrument [Member] | Fair Value [Member]
Derivative [Line Items]
Total Derivative Notional Values	20,200,000,000	20,300,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Cash Flow [Member]
Derivative [Line Items]
Total Derivative Notional Values	20,000,000,000	15,200,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Fair Value [Member]
Derivative [Line Items]
Total Derivative Notional Values	12,800,000,000	11,800,000,000
Designated as Hedging Instrument [Member] | Cross-Currency Interest Rate Swaps [Member] | Fair Value [Member]
Derivative [Line Items]
Total Derivative Notional Values	7,400,000,000	8,500,000,000
Trading [Member]
Derivative [Line Items]
Total Derivative Notional Values	71,800,000,000	45,200,000,000
Trading [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Total Derivative Notional Values	47,300,000,000	23,800,000,000
Trading [Member] | Floor Income Contracts [Member]
Derivative [Line Items]
Total Derivative Notional Values	21,900,000,000	18,500,000,000
Trading [Member] | Cross-Currency Interest Rate Swaps [Member]
Derivative [Line Items]
Total Derivative Notional Values	300,000,000	300,000,000
Trading [Member] | Other [Member]
Derivative [Line Items]
Total Derivative Notional Values	$ 2,300,000,000	$ 2,600,000,000

Derivative Financial Instrume47

Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives, Net	$ (17)	$ (47)	$ (20)	$ (177)
Unrealized Gain (Loss) on Derivatives	472	(165)	560	551
Total Gain (Loss) On Derivatives, Net	(25)	(28)	(41)	(27)
Realized Gain (Loss) on Derivatives	(14)	(10)	(8)	(85)
Unrealized Gain (Loss) on Hedged Item	(480)	184	(581)	(401)
Total Gain (Loss) on Derivatives, Gross	(22)	9	(29)	65
Trading [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	(5)	39	49	137
Realized Gain (Loss) on Derivatives	(17)	(47)	(20)	(177)
Unrealized Gain (Loss) on Derivatives, Net	472	(165)	560	551
Total Gain (Loss) on Derivatives, Gross	(22)	(8)	29	(40)
Trading [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	(8)	11	(15)	63
Realized Gain (Loss) on Derivatives	5	11	25	20
Total Gain (Loss) on Derivatives, Gross	(3)	22	10	83
Trading [Member] | Cross-Currency Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	(4)	25	8	45
Realized Gain (Loss) on Derivatives	(2)	(1)	(3)	(2)
Total Gain (Loss) on Derivatives, Gross	(6)	24	5	43
Trading [Member] | Floor Income Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	13	7	66	34
Realized Gain (Loss) on Derivatives	(18)	(56)	(38)	(194)
Total Gain (Loss) on Derivatives, Gross	(5)	(49)	28	(160)
Trading [Member] | Other [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	(6)	(4)	(10)	(5)
Realized Gain (Loss) on Derivatives	(2)	(1)	(4)	(1)
Total Gain (Loss) on Derivatives, Gross	(8)	(5)	(14)	(6)
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	(480)	184	(581)	(401)
Designated as Hedging Instrument [Member] | Fair Value [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	477	(204)	511	414
Realized Gain (Loss) on Derivatives	17	48	42	103
Unrealized Gain (Loss) on Hedged Item	(480)	184	(581)	(401)
Total Gain (Loss) on Derivatives, Gross	14	28	(28)	116
Designated as Hedging Instrument [Member] | Fair Value [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	18	71	(66)	315
Realized Gain (Loss) on Derivatives	46	68	100	139
Unrealized Gain (Loss) on Hedged Item	(38)	(68)	23	(347)
Total Gain (Loss) on Derivatives, Gross	26	71	57	107
Designated as Hedging Instrument [Member] | Fair Value [Member] | Cross-Currency Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	459	(275)	577	99
Realized Gain (Loss) on Derivatives	(29)	(20)	(58)	(36)
Unrealized Gain (Loss) on Hedged Item	(442)	252	(604)	(54)
Total Gain (Loss) on Derivatives, Gross	(12)	(43)	(85)	9
Designated as Hedging Instrument [Member] | Cash Flow [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives	(14)	(11)	(30)	(11)
Total Gain (Loss) on Derivatives, Gross	(14)	(11)	(30)	(11)
Designated as Hedging Instrument [Member] | Cash Flow [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives	(14)	(11)	(30)	(11)
Total Gain (Loss) on Derivatives, Gross	(14)	(11)	(30)	(11)
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Less: realized gains (losses) recorded in interest expense	3	37	12	92
Realized Gain (Loss) on Derivatives	$ 3	$ 37	$ 12	$ 92

Derivative Financial Instrume48

Derivative Financial Instruments - Collateral Held and Pledged (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Collateral held:
Cash (obligation to return cash collateral is recorded in short-term borrowings)	$ 379	$ 345
Securities at fair value - corporate derivatives (not recorded in financial statements)	136	193
Securities at fair value - on-balance sheet securitization derivatives (not recorded in financial statements)	243	230
Total collateral held	758	768
Derivative asset at fair value including accrued interest	610	689
Collateral pledged to others:
Cash (right to receive return of cash collateral is recorded in investments)	283	319
Total collateral pledged	283	319
Derivative liability at fair value including accrued interest and premium receivable	$ 1,039	$ 1,670

Other Assets - Schedule of Othe

Other Assets - Schedule of Other Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Offsetting [Abstract]
Accrued interest receivable, net	$ 1,821	$ 1,663
Income tax asset, net current and deferred	715	725
Benefit and insurance-related investments	495	488
Derivatives at fair value	432	534
Other loans, net	189	148
Fixed assets, net	152	160
Accounts receivable	109	95
Other	363	380
Total	$ 4,276	$ 4,193

Stockholders' Equity - Common S

Stockholders' Equity - Common Share Repurchases and Issuances (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Equity, Class of Treasury Stock [Line Items]
Average purchase price per share	$ 15.10	$ 12.90	$ 15.04	$ 11.45
Shares repurchased related to employee stock-based compensation plans	255,875	368,439	1,610,155	1,354,712
Average purchase price per share	$ 15.70	$ 13.05	$ 15.58	$ 10.80
Common shares issued	355,802	467,007	3,150,312	2,966,592
Common Stock Shares Outstanding [Member]
Equity, Class of Treasury Stock [Line Items]
Common shares repurchased	10,936,715	13,579,381	18,300,007	32,789,662
Shares repurchased related to employee stock-based compensation plans	255,875	368,439	1,610,155	1,354,712
Common shares issued	355,802	467,007	3,150,312	2,966,592

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Class of Stock [Line Items]
Common stock dividend paid	$ 0.16	$ 0.16	$ 0.16	$ 0.32	$ 0.32
Purchase price of common stock repurchased on open market	$ 165,000,000		$ 175,000,000	$ 275,000,000	$ 375,000,000
Authorized share repurchased program remaining available amount	$ 325,000,000			$ 325,000,000
Common Stock [Member]
Class of Stock [Line Items]
Closing price of common stock	$ 16.65			$ 16.65
Common Stock Shares Outstanding [Member]
Class of Stock [Line Items]
Common shares repurchased	10,936,715		13,579,381	18,300,007	32,789,662

Earnings per Common Share - Sch

Earnings per Common Share - Schedule of Earnings per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net income attributable to Navient Corporation	$ 112	$ 125	$ 200	$ 305
Denominator:
Weighted average shares used to compute basic EPS	280	322	284	331
Effect of dilutive securities:
Dilutive effect of stock options, non-vested restricted stock, restricted stock units and Employee Stock Purchase Plans ("ESPPs")	5	6	7	4
Dilutive potential common shares	5	6	7	4
Weighted average shares used to compute diluted EPS	285	328	291	335
Basic earnings (loss) per common share attributable to Navient Corporation	$ 0.40	$ 0.39	$ 0.70	$ 0.92
Diluted earnings (loss) per common share attributable to Navient Corporation	$ 0.39	$ 0.38	$ 0.69	$ 0.91

Earnings per Common Share - S53

Earnings per Common Share - Schedule of Earnings per Common Share (Parenthetical) (Detail) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock awards not included in the computation of diluted earnings per share	5	5	5	5

Fair Value Measurements - Valua

Fair Value Measurements - Valuation of Financial Instruments that are Marked-to-Market on Recurring Basis (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Available-for-sale investments:
Available-for-sale investments	$ 3	$ 3
Derivative assets	473	565
Derivative liabilities	(1,101)	(1,701)
Interest Rate Swaps [Member]
Available-for-sale investments:
Derivative assets	453	565
Derivative liabilities	(191)	(208)
Cross-Currency Interest Rate Swaps [Member]
Available-for-sale investments:
Derivative assets	20
Derivative liabilities	(730)	(1,296)
Other [Member]
Available-for-sale investments:
Derivative liabilities	(22)	(13)
Floor Income Contracts [Member]
Available-for-sale investments:
Derivative liabilities	(158)	(184)
Fair Value Measurements Recurring [Member]
Available-for-sale investments:
Available-for-sale investments	3	3
Derivative assets	473	565
Total	476	568
Derivative liabilities	(1,101)	(1,701)
Total	(1,101)	(1,701)
Fair Value Measurements Recurring [Member] | Interest Rate Swaps [Member]
Available-for-sale investments:
Derivative assets	453	565
Derivative liabilities	(191)	(208)
Fair Value Measurements Recurring [Member] | Cross-Currency Interest Rate Swaps [Member]
Available-for-sale investments:
Derivative assets	20
Derivative liabilities	(730)	(1,296)
Fair Value Measurements Recurring [Member] | Other [Member]
Available-for-sale investments:
Derivative liabilities	(22)	(13)
Fair Value Measurements Recurring [Member] | Floor Income Contracts [Member]
Available-for-sale investments:
Derivative liabilities	(158)	(184)
Fair Value Measurements Recurring [Member] | Agency Residential Mortgage-Backed Securities [Member]
Available-for-sale investments:
Available-for-sale investments	1	1
Fair Value Measurements Recurring [Member] | Other [Member]
Available-for-sale investments:
Available-for-sale investments	2	2
Level 2 [Member] | Fair Value Measurements Recurring [Member]
Available-for-sale investments:
Available-for-sale investments	3	3
Derivative assets	448	553
Total	451	556
Derivative liabilities	(340)	(387)
Total	(340)	(387)
Level 2 [Member] | Fair Value Measurements Recurring [Member] | Interest Rate Swaps [Member]
Available-for-sale investments:
Derivative assets	448	553
Derivative liabilities	(138)	(150)
Level 2 [Member] | Fair Value Measurements Recurring [Member] | Cross-Currency Interest Rate Swaps [Member]
Available-for-sale investments:
Derivative liabilities	(44)	(53)
Level 2 [Member] | Fair Value Measurements Recurring [Member] | Floor Income Contracts [Member]
Available-for-sale investments:
Derivative liabilities	(158)	(184)
Level 2 [Member] | Fair Value Measurements Recurring [Member] | Agency Residential Mortgage-Backed Securities [Member]
Available-for-sale investments:
Available-for-sale investments	1	1
Level 2 [Member] | Fair Value Measurements Recurring [Member] | Other [Member]
Available-for-sale investments:
Available-for-sale investments	2	2
Level 3 [Member] | Fair Value Measurements Recurring [Member]
Available-for-sale investments:
Derivative assets	25	12
Total	25	12
Derivative liabilities	(761)	(1,314)
Total	(761)	(1,314)
Level 3 [Member] | Fair Value Measurements Recurring [Member] | Interest Rate Swaps [Member]
Available-for-sale investments:
Derivative assets	5	12
Derivative liabilities	(53)	(58)
Level 3 [Member] | Fair Value Measurements Recurring [Member] | Cross-Currency Interest Rate Swaps [Member]
Available-for-sale investments:
Derivative assets	20
Derivative liabilities	(686)	(1,243)
Level 3 [Member] | Fair Value Measurements Recurring [Member] | Other [Member]
Available-for-sale investments:
Derivative liabilities	$ (22)	$ (13)

Fair Value Measurements - Chang

Fair Value Measurements - Change in Balance Sheet Carrying Value Associated with Level 3 Financial Instruments Carried at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	$ (1,183)	$ (564)	$ (1,302)	$ (949)
Total gains/(losses) (realized and unrealized):
Included in earnings	415	(302)	501	65
Included in other comprehensive income	0	0	0	0
Settlements	32	21	65	39
Transfers in and/or out of level 3	0	0	0	0
Balance, end of period	(736)	(845)	(736)	(845)
Change in unrealized gains/(losses) relating to instruments still held at the reporting date	447	(281)	505	104
Interest Rate Swaps [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	(42)	(32)	(46)	(44)
Total gains/(losses) (realized and unrealized):
Included in earnings	(7)	(5)	(5)	6
Included in other comprehensive income	0	0	0	0
Settlements	1		3	1
Transfers in and/or out of level 3	0	0	0	0
Balance, end of period	(48)	(37)	(48)	(37)
Change in unrealized gains/(losses) relating to instruments still held at the reporting date	(6)	(4)	(2)	8
Cross-Currency Interest Rate Swaps [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	(1,125)	(528)	(1,243)	(903)
Total gains/(losses) (realized and unrealized):
Included in earnings	430	(293)	519	65
Included in other comprehensive income	0	0	0	0
Settlements	29	20	58	37
Transfers in and/or out of level 3	0	0	0	0
Balance, end of period	(666)	(801)	(666)	(801)
Change in unrealized gains/(losses) relating to instruments still held at the reporting date	459	(273)	516	102
Other [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	(16)	(4)	(13)	(2)
Total gains/(losses) (realized and unrealized):
Included in earnings	(8)	(4)	(13)	(6)
Included in other comprehensive income	0	0	0	0
Settlements	2	1	4	1
Transfers in and/or out of level 3	0	0	0	0
Balance, end of period	(22)	(7)	(22)	(7)
Change in unrealized gains/(losses) relating to instruments still held at the reporting date	$ (6)	$ (4)	$ (9)	$ (6)

Fair Value Measurements - Inclu

Fair Value Measurements - Included in Earnings (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gains (losses) on derivative and hedging activities, net	$ 415	$ (302)	$ 501	$ 65
Gain (Loss) on Derivative Instruments [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gains (losses) on derivative and hedging activities, net	444	(282)	559	102
Interest Expense [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gains (losses) on derivative and hedging activities, net	$ (29)	$ (20)	$ (58)	$ (37)

Fair Value Measurements - Unobs

Fair Value Measurements - Unobservable Data Used in Recurring Valuations of Level 3 (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Interest Rate Swaps [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative financial instruments, Fair Value	$ 262	$ 357
Cross-Currency Interest Rate Swaps [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative financial instruments, Fair Value	(710)	(1,296)
Other [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative financial instruments, Fair Value	(22)	$ (13)
Level 3 [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative financial instruments, Fair Value	(736)
Level 3 [Member] | Cross-Currency Interest Rate Swaps [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative financial instruments, Fair Value	$ (666)
Discounted cash flow	Discounted Cash Flow, Constant Prepayment Rate
Constant prepayment rate	3.30%
Level 3 [Member] | Other [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative financial instruments, Fair Value	$ (22)
Level 3 [Member] | Prime/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative financial instruments, Fair Value	$ (48)
Discounted cash flow	Discounted Cash Flow, Constant Prepayment Rate
Constant prepayment rate	4.90%
Level 3 [Member] | Prime/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Minimum [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Bid/ask adjustment to discount rate	0.05%
Level 3 [Member] | Prime/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Maximum [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Bid/ask adjustment to discount rate	0.08%
Level 3 [Member] | Prime/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Weighted Average [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Bid/ask adjustment to discount rate	0.08%

Fair Value Measurements - Fair

Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total earning assets, Carrying Value	$ 115,420	$ 116,273
Short-term borrowings, Carrying Value	3,918	2,334
Long-term borrowings, Carrying Value	110,778	112,368
Total interest-bearing liabilities, Carrying Value	114,696	114,702
Total earning assets, Fair Value	115,463	115,020
Short-term borrowings, Fair Value	3,950	2,346
Long-term borrowings, Fair Value	109,764	109,826
Total interest-bearing liabilities, Fair Value	113,714	112,172
FFELP Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, Carrying Value	86,140	87,730
Loans receivable, Fair Value	85,837	86,626
Floor Income Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial instruments, Carrying Value	(158)	(184)
Derivative financial instruments, Fair Value	(158)	(184)
Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial instruments, Carrying Value	262	357
Derivative financial instruments, Fair Value	262	357
Cross-Currency Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial instruments, Carrying Value	(710)	(1,296)
Derivative financial instruments, Fair Value	(710)	(1,296)
Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial instruments, Carrying Value	(22)	(13)
Derivative financial instruments, Fair Value	(22)	(13)
Private Education Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, Carrying Value	24,223	23,340
Loans receivable, Fair Value	24,569	23,191
Difference [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total earning assets, Fair Value	43	(1,253)
Short-term borrowings, Fair Value	(32)	(12)
Long-term borrowings, Fair Value	1,014	2,542
Total interest-bearing liabilities, Fair Value	982	2,530
Excess of net asset fair value over carrying value	1,025	1,277
Difference [Member] | FFELP Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans receivable, Fair Value	(303)	(1,104)
Difference [Member] | Private Education Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans receivable, Fair Value	346	(149)
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and investments	5,057	5,203
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and investments	$ 5,057	$ 5,203

Fair Value Measurements - Fai59

Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Available-for-sale investments, cost basis	$ 3	$ 3
Available-for-sale investments, fair value	$ 3	$ 3

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Lawsuit Filing Date	May 4, 2015
Lawsuit settlement date	July, 2017
Total reserves established during year		$ 177,000,000	$ 177,000,000
DOJ Order [Member]
Loss Contingencies [Line Items]
Settlement fund under DOJ		$ 60,000,000
Consent order, term		4 years
Navient Solutions LLC [Member] | DOJ Order [Member]
Loss Contingencies [Line Items]
Civil money penalties		$ 55,000
SLM BankCo [Member] | Indemnification Matters [Member]
Loss Contingencies [Line Items]
Reserve for estimated amounts and costs incurred	$ 0

Segment Reporting - Asset Infor

Segment Reporting - Asset Information for Loans Segment (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Other	$ 4,276	$ 4,193
Total assets	120,354	121,136
Private Education Loans Segment [Member]
Segment Reporting Information [Line Items]
Loans, net	24,223	23,340
Cash and investments	737	667
Other	1,513	1,567
Total assets	26,473	25,574
FFELP Loans Segment [Member]
Segment Reporting Information [Line Items]
Loans, net	86,140	87,730
Cash and investments	3,088	3,212
Other	1,979	1,907
Total assets	$ 91,207	$ 92,849

Segment Reporting - Additional

Segment Reporting - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 120,354	$ 121,136
Business Services Segment [Member]
Segment Reporting Information [Line Items]
Total assets	589	587
Other Segment [Member]
Segment Reporting Information [Line Items]
Total assets	$ 2,100	$ 2,100

Segment Reporting - Segment Res

Segment Reporting - Segment Results and Reconciliations to GAAP (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income:
Cash and investments	$ 10	$ 6	$ 17	$ 12
Total interest income	1,070	1,028	2,085	2,080
Total interest expense	719	599	1,394	1,165
Net interest income (loss)	351	429	691	915
Less: provisions for loan losses	105	110	212	221
Net interest income (loss) after provisions for loan losses	246	319	479	694
Other income (loss):
Servicing revenue	70	71	146	154
Asset recovery and business processing revenue	111	101	210	191
Other income (loss)	(19)	(49)	(42)	(62)
Total other income	162	123	314	283
Expenses:
Direct operating expenses	175	175	351	362
Overhead expenses	55	55	118	116
Total operating expenses	230	230	469	478
Goodwill and acquired intangible asset impairment and amortization	6	6	11	10
Total expenses	236	236	480	488
Income (loss) before income tax expense (benefit)	172	206	313	489
Income tax expense (benefit)	60	81	113	184
Net income (loss)	112	125	200	305
Education Loan Portfolio [Member]
Interest income:
Total interest income	1,054	1,020	2,058	2,065
Other Loans [Member]
Interest income:
Total interest income	6	2	10	3
Operating Segments [Member]
Interest income:
Cash and investments	10	6	17	12
Total interest income	1,066	998	2,074	1,971
Total interest expense	723	590	1,397	1,147
Net interest income (loss)	343	408	677	824
Less: provisions for loan losses	105	110	212	221
Net interest income (loss) after provisions for loan losses	238	298	465	603
Other income (loss):
Servicing revenue	70	71	146	154
Asset recovery and business processing revenue	111	101	210	191
Other income (loss)	4	4	10	7
Total other income	185	176	366	352
Expenses:
Direct operating expenses	175	175	351	362
Overhead expenses	55	55	118	116
Total operating expenses	230	230	469	478
Total expenses	230	230	469	478
Income (loss) before income tax expense (benefit)	193	244	362	477
Income tax expense (benefit)	70	90	132	176
Net income (loss)	123	154	230	301
Operating Segments [Member] | Education Loan Portfolio [Member]
Interest income:
Total interest income	1,050	990	2,047	1,956
Operating Segments [Member] | Other Loans [Member]
Interest income:
Total interest income	6	2	10	3
Operating Segments [Member] | FFELP Loans Segment [Member]
Interest income:
Cash and investments	7	5	12	8
Total interest income	671	593	1,299	1,151
Total interest expense	495	388	951	746
Net interest income (loss)	176	205	348	405
Less: provisions for loan losses	10	10	20	17
Net interest income (loss) after provisions for loan losses	166	195	328	388
Other income (loss):
Servicing revenue	13	14	26	31
Total other income	13	14	26	31
Expenses:
Direct operating expenses	90	101	183	206
Total operating expenses	90	101	183	206
Total expenses	90	101	183	206
Income (loss) before income tax expense (benefit)	89	108	171	213
Income tax expense (benefit)	32	40	63	79
Net income (loss)	57	68	108	134
Operating Segments [Member] | FFELP Loans Segment [Member] | Education Loan Portfolio [Member]
Interest income:
Total interest income	664	588	1,287	1,143
Operating Segments [Member] | Private Education Loans Segment [Member]
Interest income:
Cash and investments	1		1	1
Total interest income	387	402	761	814
Total interest expense	193	173	380	345
Net interest income (loss)	194	229	381	469
Less: provisions for loan losses	95	100	190	204
Net interest income (loss) after provisions for loan losses	99	129	191	265
Other income (loss):
Servicing revenue		3	4	8
Total other income		3	4	8
Expenses:
Direct operating expenses	38	41	78	84
Total operating expenses	38	41	78	84
Total expenses	38	41	78	84
Income (loss) before income tax expense (benefit)	61	91	117	189
Income tax expense (benefit)	22	34	43	70
Net income (loss)	39	57	74	119
Operating Segments [Member] | Private Education Loans Segment [Member] | Education Loan Portfolio [Member]
Interest income:
Total interest income	386	402	760	813
Operating Segments [Member] | Business Services Segment [Member]
Other income (loss):
Servicing revenue	145	153	294	315
Asset recovery and business processing revenue	111	101	210	191
Other income (loss)			2
Total other income	256	254	506	506
Expenses:
Direct operating expenses	129	125	256	258
Total operating expenses	129	125	256	258
Total expenses	129	125	256	258
Income (loss) before income tax expense (benefit)	127	129	250	248
Income tax expense (benefit)	46	48	91	91
Net income (loss)	81	81	159	157
Operating Segments [Member] | Other Segment [Member]
Interest income:
Cash and investments	2	1	4	3
Total interest income	8	3	14	6
Total interest expense	35	29	66	56
Net interest income (loss)	(27)	(26)	(52)	(50)
Less: provisions for loan losses			2
Net interest income (loss) after provisions for loan losses	(27)	(26)	(54)	(50)
Other income (loss):
Other income (loss)	4	4	8	7
Total other income	4	4	8	7
Expenses:
Direct operating expenses	6	7	12	14
Overhead expenses	55	55	118	116
Total operating expenses	61	62	130	130
Total expenses	61	62	130	130
Income (loss) before income tax expense (benefit)	(84)	(84)	(176)	(173)
Income tax expense (benefit)	(30)	(32)	(65)	(64)
Net income (loss)	(54)	(52)	(111)	(109)
Operating Segments [Member] | Other Segment [Member] | Other Loans [Member]
Interest income:
Total interest income	6	2	10	3
Eliminations [Member]
Other income (loss):
Servicing revenue	(88)	(99)	(178)	(200)
Total other income	(88)	(99)	(178)	(200)
Expenses:
Direct operating expenses	(88)	(99)	(178)	(200)
Total operating expenses	(88)	(99)	(178)	(200)
Total expenses	(88)	(99)	(178)	(200)
Adjustments [Member] | Reclassifications [Member]
Interest income:
Total interest income	18	56	38	195
Total interest expense	(1)	9	2	18
Net interest income (loss)	19	47	36	177
Net interest income (loss) after provisions for loan losses	19	47	36	177
Other income (loss):
Other income (loss)	(19)	(47)	(36)	(177)
Total other income	(19)	(47)	(36)	(177)
Adjustments [Member] | Reclassifications [Member] | Education Loan Portfolio [Member]
Interest income:
Total interest income	18	56	38	195
Adjustments [Member] | Additions (Subtractions) [Member]
Interest income:
Total interest income	(14)	(26)	(27)	(86)
Total interest expense	(3)		(5)
Net interest income (loss)	(11)	(26)	(22)	(86)
Net interest income (loss) after provisions for loan losses	(11)	(26)	(22)	(86)
Other income (loss):
Other income (loss)	(4)	(6)	(16)	108
Total other income	(4)	(6)	(16)	108
Expenses:
Goodwill and acquired intangible asset impairment and amortization	6	6	11	10
Total expenses	6	6	11	10
Income (loss) before income tax expense (benefit)	(21)	(38)	(49)	12
Income tax expense (benefit)	(10)	(9)	(19)	8
Net income (loss)	(11)	(29)	(30)	4
Adjustments [Member] | Additions (Subtractions) [Member] | Education Loan Portfolio [Member]
Interest income:
Total interest income	(14)	(26)	(27)	(86)
Adjustments [Member] | Total Adjustments [Member]
Interest income:
Total interest income	4	30	11	109
Total interest expense	(4)	9	(3)	18
Net interest income (loss)	8	21	14	91
Net interest income (loss) after provisions for loan losses	8	21	14	91
Other income (loss):
Other income (loss)	(23)	(53)	(52)	(69)
Total other income	(23)	(53)	(52)	(69)
Expenses:
Goodwill and acquired intangible asset impairment and amortization	6	6	11	10
Total expenses	6	6	11	10
Income (loss) before income tax expense (benefit)	(21)	(38)	(49)	12
Income tax expense (benefit)	(10)	(9)	(19)	8
Net income (loss)	(11)	(29)	(30)	4
Adjustments [Member] | Total Adjustments [Member] | Education Loan Portfolio [Member]
Interest income:
Total interest income	$ 4	$ 30	$ 11	$ 109

Segment Reporting - Segment R64

Segment Reporting - Segment Result and Reconciliations to GAAP - Core Earnings Adjustments (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest income (loss) after provisions for loan losses	$ 246	$ 319	$ 479	$ 694
Total other income (loss)	162	123	314	283
Goodwill and acquired intangible asset impairment and amortization	6	6	11	10
Income tax expense (benefit)	60	81	113	184
Net income (loss)	112	125	200	305
Total Adjustments [Member] | Adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest income (loss) after provisions for loan losses	8	21	14	91
Total other income (loss)	(23)	(53)	(52)	(69)
Goodwill and acquired intangible asset impairment and amortization	6	6	11	10
Total "Core Earnings" adjustments to GAAP	(21)	(38)	(49)	12
Income tax expense (benefit)	(10)	(9)	(19)	8
Net income (loss)	(11)	(29)	(30)	4
Net Impact of Goodwill and Acquired Intangible Assets [Member] | Total Adjustments [Member] | Adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Goodwill and acquired intangible asset impairment and amortization	6	6	11	10
Total "Core Earnings" adjustments to GAAP	(6)	(6)	(11)	(10)
Net Impact of Derivative Accounting [Member] | Total Adjustments [Member] | Adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest income (loss) after provisions for loan losses	8	21	14	91
Total other income (loss)	(23)	(53)	(52)	(69)
Total "Core Earnings" adjustments to GAAP	$ (15)	$ (32)	$ (38)	$ 22

Segment Reporting - Core Earnin

Segment Reporting - Core Earnings Adjustments to GAAP (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
"Core Earnings" adjustments to GAAP:
Net tax effect	$ (60)	$ (81)	$ (113)	$ (184)
Net income attributable to Navient Corporation	112	125	200	305
Adjustments [Member] | Total Adjustments [Member]
"Core Earnings" adjustments to GAAP:
Core Earnings adjustments to GAAP	(21)	(38)	(49)	12
Net tax effect	10	9	19	(8)
Net income attributable to Navient Corporation	(11)	(29)	(30)	4
Adjustments [Member] | Total Adjustments [Member] | Net Impact of Goodwill and Acquired Intangible Assets [Member]
"Core Earnings" adjustments to GAAP:
Core Earnings adjustments to GAAP	(6)	(6)	(11)	(10)
Adjustments [Member] | Total Adjustments [Member] | Net Impact of Derivative Accounting [Member]
"Core Earnings" adjustments to GAAP:
Core Earnings adjustments to GAAP	$ (15)	$ (32)	$ (38)	$ 22

Segment Reporting - Core Earn66

Segment Reporting - Core Earnings Adjustments to GAAP (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2017USD ($)
Segment Reporting [Abstract]
Amount that will be equal to cumulative net unrealized gain or loss over the life of the contract	$ 0