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Employees' Stock Incentive Plans (Notes)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Employees' Stock Incentive Plans
Employees’ Stock Incentive Plans
Our annual equity award grants and vesting occurred in the first quarter of 2017. Other off-cycle equity grants may occur throughout the year.
Stock Options:
Our stock option activity and related information was:
 
Number of Stock Options
 
Weighted Average Exercise Price
(per share)
Outstanding at December 31, 2016
20,560,140

 
$
37.39

Granted
1,572,848

 
89.01

Forfeited
(559,109
)
 
48.13

Exercised
(2,005,638
)
 
32.94

Outstanding at September 30, 2017
19,568,241

 
41.69


The aggregate intrinsic value of stock options exercised during the period was $115 million for the nine months ended September 30, 2017.
Restricted Stock Units:
Our restricted stock unit (“RSU”) activity and related information was:
 
Number of Units
 
Weighted Average Grant Date Fair Value
(per share)
Outstanding at December 31, 2016
806,744

 
$
71.95

Granted
1,678,110

 
85.03

Forfeited
(191,072
)
 
82.85

Vested
(136,272
)
 
72.96

Outstanding at September 30, 2017
2,157,510

 
81.10


The aggregate fair value of RSUs that vested during the period was $12 million for the nine months ended September 30, 2017.