Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation Plans and Awards - Schedule of activities for RSUs and MSUs (Details)

v3.3.1.900
Stock-based Compensation Plans and Awards - Schedule of activities for RSUs and MSUs (Details)
 12 Months Ended
Dec. 31, 2015
$ / shares
shares
Number of RSUs  
Forfeited (in shares) (1,245,994)
RSUs  
Number of RSUs  
Unvested at the beginning of the period (in shares) 11,024,068
Granted (in shares) 11,678,792
Vested (in shares) (4,184,415)
Forfeited (in shares) (1,246,360)
Unvested at the end of the period (in shares) 17,272,085
Expected to vest at end of the period (in shares) 15,595,029
Weighted-Average Grant Date Fair Value  
Unvested at the beginning of the period (in dollars per share) | $ / shares $ 21.99
Granted (in dollars per share) | $ / shares 15.40
Vested (in dollars per share) | $ / shares 21.06
Forfeited (in dollars per share) | $ / shares 19.89
Unvested at the end of the period (in dollars per share) | $ / shares 17.91
Expected to vest at end of the period (in dollars per share) | $ / shares $ 17.90
Market stock units granted  
Number of RSUs  
Unvested at the beginning of the period (in shares) 0
Granted (in shares) 776,000
Vested (in shares) 0
Forfeited (in shares) 0
Unvested at the end of the period (in shares) 776,000
Expected to vest at end of the period (in shares) 710,882
Weighted-Average Grant Date Fair Value  
Unvested at the beginning of the period (in dollars per share) | $ / shares $ 0.00
Granted (in dollars per share) | $ / shares 5.60
Vested (in dollars per share) | $ / shares 0.00
Forfeited (in dollars per share) | $ / shares 0.00
Unvested at the end of the period (in dollars per share) | $ / shares 5.60
Expected to vest at end of the period (in dollars per share) | $ / shares $ 5.60