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Segment Reporting - Core Earnings Adjustments to GAAP (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
"Core Earnings" adjustments to GAAP:
Net tax effect	$ (53)	$ (103)
Net income attributable to Navient Corporation	88	181
Total Adjustments [Member]
"Core Earnings" adjustments to GAAP:
Core Earnings adjustments to GAAP	(29)	50
Net tax effect	10	(16)
Net income attributable to Navient Corporation	(19)	34
Total Adjustments [Member] | Net Impact of Goodwill and Acquired Intangible Assets [Member]
"Core Earnings" adjustments to GAAP:
Core Earnings adjustments to GAAP	(6)	(4)
Total Adjustments [Member] | Net Impact of Derivative Accounting [Member]
"Core Earnings" adjustments to GAAP:
Core Earnings adjustments to GAAP	$ (23)	$ 54

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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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