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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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Total "Core Earnings" adjustments to GAAP.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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