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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data (Unaudited) | Quarterly Financial Data (Unaudited)
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total (1)
| (in millions, except per unit data)
2017 |  |  |  |  |  |  |  |  |
Total revenues | $ | 6,667 |  |  | $ | 6,078 |  |  | $ | 5,873 |  |  | $ | 7,605 |  |  | $ | 26,223 |
Gross margin (2) | $ | 665 |  |  | $ | 325 |  |  | $ | 112 |  |  | $ | 327 |  |  | $ | 1,429 |
Operating income | $ | 591 |  |  | $ | 257 |  |  | $ | 44 |  |  | $ | 261 |  |  | $ | 1,153 |
Net income | $ | 444 |  |  | $ | 189 |  |  | $ | 34 |  |  | $ | 191 |  |  | $ | 858 |
Net income attributable to PAA | $ | 444 |  |  | $ | 188 |  |  | $ | 33 |  |  | $ | 191 |  |  | $ | 856 |
Basic net income/(loss) per common unit | $ | 0.59 |  |  | $ | 0.21 |  |  | $ | (0.01 | ) |  | $ | 0.19 |  |  | $ | 0.96 |
Diluted net income/(loss) per common unit | $ | 0.58 |  |  | $ | 0.21 |  |  | $ | (0.01 | ) |  | $ | 0.19 |  |  | $ | 0.95 |
Cash distributions per common unit (3) | $ | 0.55 |  |  | $ | 0.55 |  |  | $ | 0.55 |  |  | $ | 0.30 |  |  | $ | 1.95 |
2016 |  |  |  |  |  |  |  |  |
Total revenues | $ | 4,111 |  |  | $ | 4,950 |  |  | $ | 5,170 |  |  | $ | 5,952 |  |  | $ | 20,182 |
Gross margin (2) | $ | 349 |  |  | $ | 219 |  |  | $ | 419 |  |  | $ | 286 |  |  | $ | 1,273 |
Operating income | $ | 282 |  |  | $ | 146 |  |  | $ | 349 |  |  | $ | 218 |  |  | $ | 994 |
Net income | $ | 203 |  |  | $ | 102 |  |  | $ | 298 |  |  | $ | 127 |  |  | $ | 730 |
Net income attributable to PAA | $ | 202 |  |  | $ | 101 |  |  | $ | 297 |  |  | $ | 126 |  |  | $ | 726 |
Basic net income/(loss) per common unit | $ | 0.07 |  |  | $ | (0.20 | ) |  | $ | 0.40 |  |  | $ | 0.14 |  |  | $ | 0.43 |
Diluted net income/(loss) per common unit | $ | 0.07 |  |  | $ | (0.20 | ) |  | $ | 0.40 |  |  | $ | 0.14 |  |  | $ | 0.43 |
Cash distributions per common unit (3) | $ | 0.70 |  |  | $ | 0.70 |  |  | $ | 0.70 |  |  | $ | 0.55 |  |  | $ | 2.65 |
(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 and (iii) Depreciation and amortization.
(3) | Represents cash distributions declared and paid in the period presented.

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- References No definition available. + Details
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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