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Equity-Indexed Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of LTIP awards authorized
The following is a summary of the awards authorized under our LTIPs as of December 31, 2019 (in millions):

LTIP
PAA LTIP
Awards Authorized
Plains All American 2013 Long-Term Incentive Plan13.1  
Plains All American PNG Successor Long-Term Incentive Plan1.3  
Plains All American GP LLC 2006 Long-Term Incentive Tracking Unit Plan10.8  
Total (1)
25.2  

(1)Of the 25.2 million total awards authorized, 5.9 million awards are currently available. The remaining balance has already vested or is currently outstanding.
Summary of activity under equity-indexed compensation plans
Activity for LTIP awards under our equity-indexed compensation plans denominated in PAA units is summarized in the following table (units in millions):

PAA Units (1)
UnitsWeighted Average
Grant Date
Fair Value per Unit
Outstanding at December 31, 20168.9  $29.62  
Granted0.9  $23.52  
Vested(1.7) $42.12  
Modified—  $(6.04) 
Cancelled or forfeited(0.8) $26.99  
Outstanding at December 31, 20177.3  $24.68  
Granted1.7  $23.44  
Vested(1.7) $32.42  
Modified—  $2.15  
Cancelled or forfeited(0.5) $21.99  
Outstanding at December 31, 20186.8  $22.19  
Granted3.9  $16.17  
Vested(3.3) $22.44  
Cancelled or forfeited(0.3) $23.12  
Outstanding at December 31, 20197.1  $18.67  

(1)Approximately 1.4 million, 0.6 million and 0.6 million PAA common units were issued, net of tax withholding of approximately 0.6 million, 0.2 million and 0.2 million units during 2019, 2018 and 2017, respectively, in connection with the settlement of vested awards. The remaining PAA awards (approximately 1.3 million, 0.9 million and 0.9 million units) that vested during 2019, 2018 and 2017, respectively, were settled in cash.
Summary of expense recognized and the value of vested LTIP awards under equity-indexed compensation plans The table below summarizes the expense recognized and the value of vested LTIP awards (settled both in common units and cash) under our equity-indexed compensation plans and includes both liability-classified and equity-classified awards (in millions):
201920182017
Equity-indexed compensation expense$34  $79  $41  
LTIP unit-settled vestings$47  $21  $16  
LTIP cash-settled vestings$31  $22  $25  
Estimated equity-indexed compensation plan fair value amortization We estimate that the remaining fair value will be recognized in expense as shown below (in millions):
Year
Equity-Indexed
Compensation Plan Fair Value
Amortization (1)
2020$22  
202113  
20227  
20234  
20242  
Thereafter4  
Total$52  

(1)Amounts do not include fair value associated with awards containing performance conditions that are not considered to be probable of occurring at December 31, 2019.