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Equity-Indexed Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity-Indexed Compensation Plans |
Summary of shares authorized | The following is a summary of the awards authorized under our LTIPs as of December 31, 2018 (in millions):
LTIP |  | PAA LTIP Awards Authorized
Plains All American 2013 Long-Term Incentive Plan |  | 13.1 |
Plains All American PNG Successor Long-Term Incentive Plan |  | 1.3 |
Plains All American GP LLC 2006 Long-Term Incentive Tracking Unit Plan |  | 10.8 |
Total (1) |  | 25.2 |
(1) | Of the 25.2 million total awards authorized, 8.8 million awards are currently available. The remaining balance has already vested or is currently outstanding.
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):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Equity-indexed compensation expense | $ | 79 |  |  | $ | 41 |  |  | $ | 60 |
LTIP unit-settled vestings | $ | 21 |  |  | $ | 16 |  |  | $ | 24 |
LTIP cash-settled vestings | $ | 22 |  |  | $ | 25 |  |  | $ | 28 |
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)
2019 |  | $ | 30 |
2020 |  | 14 |
2021 |  | 4 |
2022 (2) |  | — |
2023 (2) |  | — |
Total |  | $ | 48 |
(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, 2018.
(2) | Less than $1 million of expense from amortized fair value during the period.
PAA LTIP |
Equity-Indexed Compensation Plans |
Summary of activity for 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)
| Units |  | Weighted Average Grant Date Fair Value per Unit
Outstanding at December 31, 2015 | 6.9 |  |  | $ | 41.23 |
Granted | 4.5 |  |  | $ | 23.38 |
Vested | (1.9 | ) |  | $ | 45.91 |
Modified | — |  |  | $ | (8.21 | )
Cancelled or forfeited | (0.6 | ) |  | $ | 37.19 |
Outstanding at December 31, 2016 | 8.9 |  |  | $ | 29.62 |
Granted | 0.9 |  |  | $ | 23.52 |
Vested | (1.7 | ) |  | $ | 42.12 |
Modified | — |  |  | $ | (6.04 | )
Cancelled or forfeited | (0.8 | ) |  | $ | 26.99 |
Outstanding at December 31, 2017 | 7.3 |  |  | $ | 24.68 |
Granted | 1.7 |  |  | $ | 23.44 |
Vested | (1.7 | ) |  | $ | 32.42 |
Modified | — |  |  | $ | 2.15 |
Cancelled or forfeited | (0.5 | ) |  | $ | 21.99 |
Outstanding at December 31, 2018 | 6.8 |  |  | $ | 22.19 |
(1) | Approximately 0.6 million, 0.6 million and 0.5 million PAA common units were issued, net of tax withholding of approximately 0.2 million, 0.2 million and 0.3 million units during 2018, 2017 and 2016, respectively, in connection with the settlement of vested awards. The remaining PAA awards (approximately 0.9 million, 0.9 million and 1.1 million units) that vested during 2018, 2017 and 2016, respectively, were settled in cash.

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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