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Segment Reporting - Segment Result and Reconciliations to GAAP - Core Earnings Adjustments (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net interest income after provisions for loan losses $ 306 $ 430 $ 1,000 $ 1,239
Total other income (loss) 311 181 594 631
Operating expenses 228 228 706 683
Goodwill and acquired intangible asset impairment and amortization 12 3 22 7
Restructuring and other reorganization expenses       32
Income tax expense (benefit) 147 144 331 438
Net income attributable to Navient Corporation 230 237 535 711
Total Adjustments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net interest income after provisions for loan losses 7 93 98 284
Total other income (loss) 132 15 63 73
Operating expenses 0 0 0 0
Goodwill and acquired intangible asset impairment and amortization 12 3 22 7
Restructuring and other reorganization expenses       32
Total "Core Earnings" adjustments to GAAP 127 105 139 318
Income tax expense (benefit) 54 42 62 130
Net income attributable to Navient Corporation 73 63 77 188
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 12 3 22 7
Total "Core Earnings" adjustments to GAAP (12) (3) (22) (7)
Net Impact of Derivative Accounting [Member] | Total Adjustments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net interest income after provisions for loan losses 7 93 98 284
Total other income (loss) 132 15 63 73
Operating expenses 0 0 0 0
Total "Core Earnings" adjustments to GAAP 139 108 161 357
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       32
Total "Core Earnings" adjustments to GAAP       $ (32)