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Segment Reporting - Core Earnings Adjustments to GAAP (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
"Core Earnings" adjustments to GAAP: |  |  |  |
Net tax effect | $ (147) | $ (144) | $ (331) | $ (438)
Net income attributable to Navient Corporation | 230 | 237 | 535 | 711
Total Adjustments [Member] |  |  |  |
"Core Earnings" adjustments to GAAP: |  |  |  |
Core Earnings adjustments to GAAP | 127 | 105 | 139 | 318
Net tax effect | (54) | (42) | (62) | (130)
Net income attributable to Navient Corporation | 73 | 63 | 77 | 188
Total Adjustments [Member] | Net Impact of Acquired Intangibles [Member] |  |  |  |
"Core Earnings" adjustments to GAAP: |  |  |  |
Core Earnings adjustments to GAAP | (12) | (3) | (22) | (7)
Total Adjustments [Member] | Net Impact of Derivative Accounting [Member] |  |  |  |
"Core Earnings" adjustments to GAAP: |  |  |  |
Core Earnings adjustments to GAAP | $ 139 | $ 108 | $ 161 | 357
Total Adjustments [Member] | Net Impact from Spin-Off of SLM BankCo [Member] |  |  |  |
"Core Earnings" adjustments to GAAP: |  |  |  |
Core Earnings adjustments to GAAP |  |  |  | $ (32)

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