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Net Income/(Loss) Per Common Unit | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Net Income/(Loss) Per Common Unit | Net Income/(Loss) Per Common Unit After consideration of distributions to preferred unitholders (whether paid in cash or in-kind), basic and diluted net income/(loss) per common unit is determined pursuant to the two-class method as prescribed in FASB guidance. This method is an earnings allocation formula that is used to determine allocations to our limited partners and participating securities according to distributions pertaining to the current period’s net income and participation rights in undistributed earnings or distributions in excess of earnings. Under the two-class method, net income is reduced by distributions pertaining to the period, and all remaining earnings or distributions in excess of earnings are then allocated to our common unitholders and participating securities based on their respective rights to share in distributions, regardless of whether those earnings would actually be distributed during a particular period from an economic or practical perspective. Participating securities include equity-indexed compensation plan awards that have vested DERs, which entitle the grantee to a cash payment equal to the cash distribution paid on our outstanding common units. We calculate basic and diluted net income/(loss) per common unit by dividing net income/(loss) attributable to PAA (after deducting amounts allocated to the preferred unitholders and participating securities) by the basic and diluted weighted average number of common units outstanding during the period. Participating securities include equity-indexed compensation plan awards that have vested distribution equivalent rights, which entitle the grantee to a cash payment equal to the cash distribution paid on our outstanding common units. The diluted weighted average number of common units is computed based on the weighted average number of common units plus the effect of potentially dilutive securities outstanding during the period, which include (i) our Series A preferred units and (ii) our equity-indexed compensation plan awards. See Note 12 for additional information regarding our Series A preferred units. See Note 18 for a complete discussion of our equity-indexed compensation plan awards. When applying the if-converted method prescribed by FASB guidance, the possible conversion of approximately 71 million Series A preferred units, on a weighted-average basis, were excluded from the calculation of diluted net income/(loss) per common unit for the year ended December 31, 2021 and 2020 as the effect was antidilutive for both periods. Our equity-indexed compensation plan awards that contemplate the issuance of common units are considered potentially dilutive unless (i) they become vested only upon the satisfaction of a performance condition and (ii) that performance condition has yet to be satisfied. Equity-indexed compensation plan awards that were deemed to be dilutive during the year ended December 31, 2019 were reduced by a hypothetical common unit repurchase based on the remaining unamortized fair value, as prescribed by the treasury stock method in guidance issued by the FASB. For the twelve months ended December 31, 2021 and 2020, approximately 0.5 million and 0.3 million equity-indexed compensation plan awards, respectively, on a weighted-average basis, were excluded from the computation of diluted net loss per common unit as the effect did not change the presentation of diluted net income/(loss) per common unit or the effect was antidilutive. The following table sets forth the computation of basic and diluted net income/(loss) per common unit (in millions, except per unit data):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Basic Net Income/(Loss) per Common Unit |  |  |  |  |
Net income/(loss) attributable to PAA | $ | 593 |  |  | $ | (2,590) |  |  | $ | 2,171 |
Distributions to Series A preferred unitholders | (149) |  |  | (149) |  |  | (149) |
Distributions to Series B preferred unitholders | (49) |  |  | (49) |  |  | (49) |
Distributions to participating securities | (2) |  |  | (2) |  |  | (3) |
Other | — |  |  | — |  |  | (3) |
Net income/(loss) allocated to common unitholders (1) | $ | 393 |  |  | $ | (2,790) |  |  | $ | 1,967 |
Basic weighted average common units outstanding | 716 |  |  | 728 |  |  | 727 |
Basic net income/(loss) per common unit | $ | 0.55 |  |  | $ | (3.83) |  |  | $ | 2.70 |
Diluted Net Income/(Loss) per Common Unit |  |  |  |  |
Net income/(loss) attributable to PAA | $ | 593 |  |  | $ | (2,590) |  |  | $ | 2,171 |
Distributions to Series A preferred unitholders | (149) |  |  | (149) |  |  | — |
Distributions to Series B preferred unitholders | (49) |  |  | (49) |  |  | (49) |
Distributions to participating securities | (2) |  |  | (2) |  |  | (3) |
Net income/(loss) allocated to common unitholders (1) | $ | 393 |  |  | $ | (2,790) |  |  | $ | 2,119 |
Basic weighted average common units outstanding | 716 |  |  | 728 |  |  | 727 |
Effect of dilutive securities: |  |  |  |  |
Series A preferred units | — |  |  | — |  |  | 71 |
Equity-indexed compensation plan awards | — |  |  | — |  |  | 2 |
Diluted weighted average common units outstanding | 716 |  |  | 728 |  |  | 800 |
Diluted net income/(loss) per common unit | $ | 0.55 |  |  | $ | (3.83) |  |  | $ | 2.65 |
(1)We calculate net income/(loss) allocated to common unitholders based on the distributions pertaining to the current period’s net income. After adjusting for the appropriate period’s distributions, the remaining undistributed earnings or excess distributions over earnings (i.e., undistributed loss), if any, are allocated to the common unitholders and participating securities in accordance with the contractual terms of our partnership agreement in effect for the period and as further prescribed under the two-class method.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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