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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator:        
Net income attributable to Navient Corporation $ 230 $ 237 $ 535 $ 711
Denominator:        
Weighted average shares used to compute basic EPS 310 369 324 382
Effect of dilutive securities:        
Dilutive effect of stock options, non-vested restricted stock, restricted stock units and Employee Stock Purchase Plans ("ESPPs") 6 6 5 7
Dilutive potential common shares 6 6 5 7
Weighted average shares used to compute diluted EPS 316 375 329 389
Basic earnings (loss) per common share attributable to Navient Corporation:        
Continuing operations $ 0.74 $ 0.64 $ 1.65 $ 1.86
Discontinued operations 0 0 0 0
Total 0.74 0.64 1.65 1.86
Diluted earnings (loss) per common share attributable to Navient Corporation:        
Continuing operations 0.73 0.63 1.63 1.83
Discontinued operations 0 0 0 0
Total $ 0.73 $ 0.63 $ 1.63 $ 1.83