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Segment Reporting - Core Earnings Adjustments to GAAP (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
"Core Earnings" adjustments to GAAP: |  |  |  |
Net tax effect | $ (81) | $ (113) | $ (184) | $ (293)
Net income attributable to Navient Corporation | 125 | 182 | 305 | 474
Total Adjustments [Member] |  |  |  |
"Core Earnings" adjustments to GAAP: |  |  |  |
Core Earnings adjustments to GAAP | (38) | 51 | 12 | 213
Net tax effect | 9 | (23) | (8) | (87)
Net income attributable to Navient Corporation | (29) | 28 | 4 | 126
Total Adjustments [Member] | Net Impact from Spin-Off of SLM BankCo [Member] |  |  |  |
"Core Earnings" adjustments to GAAP: |  |  |  |
Core Earnings adjustments to GAAP |  | (29) |  | (32)
Total Adjustments [Member] | Net Impact of Derivative Accounting [Member] |  |  |  |
"Core Earnings" adjustments to GAAP: |  |  |  |
Core Earnings adjustments to GAAP | (32) | 83 | 22 | 249
Total Adjustments [Member] | Net Impact of Acquired Intangibles [Member] |  |  |  |
"Core Earnings" adjustments to GAAP: |  |  |  |
Core Earnings adjustments to GAAP | $ (6) | $ (3) | $ (10) | $ (4)

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