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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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Total "Core Earnings" adjustments to GAAP.

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Summary Of Core Earnings Adjustments To GAAP [Abstract]

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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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