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Segment Reporting - Segment Result and Reconciliations to GAAP - Core Earnings Adjustments (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net interest income after provisions for loan losses $ 319 $ 351 $ 694 $ 809
Total other income (loss) 123 201 283 450
Operating expenses 230 225 478 456
Goodwill and acquired intangible asset impairment and amortization 6 3 10 4
Restructuring and other reorganization expenses   29   32
Income tax expense (benefit) 81 113 184 293
Net income attributable to Navient Corporation 125 182 305 474
Total Adjustments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net interest income after provisions for loan losses 21 97 91 191
Total other income (loss) (53) (14) (69) 58
Operating expenses 0 0 0 0
Goodwill and acquired intangible asset impairment and amortization 6 3 10 4
Restructuring and other reorganization expenses   29   32
Total "Core Earnings" adjustments to GAAP (38) 51 12 213
Income tax expense (benefit) (9) 23 8 87
Net income attributable to Navient Corporation (29) 28 4 126
Net Impact from Spin-Off of SLM BankCo [Member] | Total Adjustments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating expenses 0 0 0 0
Restructuring and other reorganization expenses   29   32
Total "Core Earnings" adjustments to GAAP   (29)   (32)
Net Impact of Derivative Accounting [Member] | Total Adjustments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net interest income after provisions for loan losses 21 97 91 191
Total other income (loss) (53) (14) (69) 58
Operating expenses 0 0 0 0
Total "Core Earnings" adjustments to GAAP (32) 83 22 249
Net Impact of Acquired Intangibles [Member] | Total Adjustments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating expenses 0 0 0 0
Goodwill and acquired intangible asset impairment and amortization 6 3 10 4
Total "Core Earnings" adjustments to GAAP $ (6) $ (3) $ (10) $ (4)