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Incentive Plans
9 Months Ended
Sep. 30, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Incentive Plans
Incentive Plans
Stock-based compensation
For the three and nine months ended September 30, 2015, the Company recorded $26 million and $87 million, respectively, of stock-based compensation expense for all plans, as compared to $27 million and $89 million for the same respective periods of 2014. As of September 30, 2015, there was $131 million of unrecognized compensation expense related to unvested share-based compensation plan awards, including $21 million attributable to stock-based awards that are expected to be settled on their vesting date in cash, rather than in equity shares ("Liability Awards"). The unrecognized compensation expense will be recognized over the remaining vesting periods of the awards, which is a period of less than three years on a weighted average basis. As of September 30, 2015 and December 31, 2014, accounts payable – due to affiliates includes $11 million and $23 million, respectively, of liabilities attributable to Liability Awards.
The following table summarizes the activity that occurred during the nine months ended September 30, 2015, for each type of share-based incentive award issued by Pioneer: 
 
 
Restricted
Stock Equity
Awards
 
Restricted
Stock Liability
Awards
 
Performance
Units
 
Stock
Options
Outstanding as of December 31, 2014
 
1,233,539

 
328,087

 
154,733

 
199,058

Awards granted
 
439,742

 
158,726

 
82,431

 

Awards vested
 
(525,494
)
 
(185,302
)
 

 

Awards forfeited
 
(36,679
)
 
(28,851
)
 

 

Outstanding as of September 30, 2015
 
1,111,108

 
272,660

 
237,164

 
199,058