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Equity-Indexed Compensation Plans (Tables) | 12 Months Ended
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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 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, 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) |  |
| Units |  | Weighted Average Grant Date Fair Value per Unit
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 |
Granted | 3.9 |  |  | $ | 16.17 |
Vested | (3.3) |  |  | $ | 22.44 |
Cancelled or forfeited | (0.3) |  |  | $ | 23.12 |
Outstanding at December 31, 2019 | 7.1 |  |  | $ | 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):
| 2019 |  | 2018 |  | 2017
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 |
2021 |  | 13 |
2022 |  | 7 |
2023 |  | 4 |
2024 |  | 2 |
Thereafter |  | 4 |
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.

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- Definition Disclosure that sets forth the estimated equity-indexed compensation plan fair value amortization to be recognized as an expense for each of the five succeeding fiscal years. + References No definition available. + Details
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- Definition Tabular disclosure of share-based payment arrangement. + 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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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