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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)

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Also includes the amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References No definition available. + Details
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