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Earnings per Common Share - Schedule of Earnings per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator:
Net income attributable to Navient Corporation	$ 88	$ 181
Denominator:
Weighted average shares used to compute basic EPS	289	339
Effect of dilutive securities:
Dilutive effect of stock options, non-vested restricted stock, restricted stock units and Employee Stock Purchase Plans ("ESPPs")	7	4
Dilutive potential common shares	7	4
Weighted average shares used to compute diluted EPS	296	343
Basic earnings (loss) per common share attributable to Navient Corporation	$ 0.31	$ 0.53
Diluted earnings (loss) per common share attributable to Navient Corporation	$ 0.30	$ 0.53

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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