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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator:        
Net income attributable to Navient Corporation $ 125 $ 182 $ 305 $ 474
Denominator:        
Weighted average shares used to compute basic EPS 322 381 331 389
Effect of dilutive securities:        
Dilutive effect of stock options, non-vested restricted stock, restricted stock units and Employee Stock Purchase Plans ("ESPPs") 6 6 4 7
Dilutive potential common shares 6 6 4 7
Weighted average shares used to compute diluted EPS 328 387 335 396
Basic earnings (loss) per common share attributable to Navient Corporation:        
Continuing operations $ 0.39 $ 0.48 $ 0.92 $ 1.22
Discontinued operations 0 0 0 0
Total 0.39 0.48 0.92 1.22
Diluted earnings (loss) per common share attributable to Navient Corporation:        
Continuing operations 0.38 0.47 0.91 1.20
Discontinued operations 0 0 0 0
Total $ 0.38 $ 0.47 $ 0.91 $ 1.20