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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Quarterly financial data (unaudited) |
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total (1)
| (in millions, except per unit data)
2020 |  |  |  |  |  |  |  |  |
Total revenues | $ | 8,269 |  |  | $ | 3,225 |  |  | $ | 5,833 |  |  | $ | 5,963 |  |  | $ | 23,290 |
Gross margin (2) | $ | (189) |  |  | $ | 282 |  |  | $ | 314 |  |  | $ | 5 |  |  | $ | 411 |
Operating income/(loss) | $ | (2,773) |  |  | $ | 210 |  |  | $ | 253 |  |  | $ | (65) |  |  | $ | (2,375) |
Net income/(loss) | $ | (2,845) |  |  | $ | 144 |  |  | $ | 146 |  |  | $ | (25) |  |  | $ | (2,580) |
Net income/(loss) attributable to PAA | $ | (2,847) |  |  | $ | 142 |  |  | $ | 143 |  |  | $ | (28) |  |  | $ | (2,590) |
Basic net income/(loss) per common unit | $ | (3.98) |  |  | $ | 0.13 |  |  | $ | 0.13 |  |  | $ | (0.11) |  |  | $ | (3.83) |
Diluted net income/(loss) per common unit | $ | (3.98) |  |  | $ | 0.13 |  |  | $ | 0.13 |  |  | $ | (0.11) |  |  | $ | (3.83) |
Cash distributions per common unit (3) | $ | 0.36 |  |  | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.90 |
2019 |  |  |  |  |  |  |  |  |
Total revenues | $ | 8,375 |  |  | $ | 8,253 |  |  | $ | 7,886 |  |  | $ | 9,154 |  |  | $ | 33,669 |
Gross margin (2) | $ | 790 |  |  | $ | 526 |  |  | $ | 566 |  |  | $ | 403 |  |  | $ | 2,285 |
Operating income | $ | 714 |  |  | $ | 451 |  |  | $ | 492 |  |  | $ | 331 |  |  | $ | 1,988 |
Net income | $ | 970 |  |  | $ | 448 |  |  | $ | 454 |  |  | $ | 307 |  |  | $ | 2,180 |
Net income attributable to PAA | $ | 970 |  |  | $ | 446 |  |  | $ | 449 |  |  | $ | 306 |  |  | $ | 2,171 |
Basic net income per common unit | $ | 1.26 |  |  | $ | 0.54 |  |  | $ | 0.55 |  |  | $ | 0.35 |  |  | $ | 2.70 |
Diluted net income per common unit | $ | 1.20 |  |  | $ | 0.54 |  |  | $ | 0.55 |  |  | $ | 0.35 |  |  | $ | 2.65 |
Cash distributions per common unit (3) | $ | 0.30 |  |  | $ | 0.36 |  |  | $ | 0.36 |  |  | $ | 0.36 |  |  | $ | 1.38 |
(1)The sum of the four quarters may not equal the total year due to rounding. (2)Gross margin is calculated as Total revenues less (i) Purchases and related costs, (ii) Field operating costs, (iii) Depreciation and amortization and (iv) (Gains)/losses on asset sales and asset impairments, net. (3)Represents cash distributions declared and paid in the period presented.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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