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QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information |
| Q1 |  | Q2 |  | Q3 |  | Q4 |  | Total |
(unaudited; millions of Canadian dollars, except per share amounts) |  |  |  |  |
2019 |  |  |  |  |
Operating revenues | 12,856 |  | 13,263 |  | 11,598 |  | 12,352 |  | 50,069 |
Operating income | 2,619 |  | 2,285 |  | 1,588 |  | 1,768 |  | 8,260 |
Earnings | 2,023 |  | 1,830 |  | 1,060 |  | 914 |  | 5,827 |
Earnings attributable to controlling interests | 1,986 |  | 1,832 |  | 1,045 |  | 842 |  | 5,705 |
Earnings attributable to common shareholders | 1,891 |  | 1,736 |  | 949 |  | 746 |  | 5,322 |
Earnings per common share |  |  |  |  |
Basic | 0.94 |  | 0.86 |  | 0.47 |  | 0.37 |  | 2.64 |
Diluted | 0.94 |  | 0.86 |  | 0.47 |  | 0.36 |  | 2.63 |
2018 |  |  |  |  |
Operating revenues | 12,726 |  | 10,745 |  | 11,345 |  | 11,562 |  | 46,378 |
Operating income | 878 |  | 1,571 |  | 854 |  | 1,513 |  | 4,816 |
Earnings | 510 |  | 1,327 |  | 213 |  | 1,283 |  | 3,333 |
Earnings attributable to controlling interests | 534 |  | 1,160 |  | 4 |  | 1,184 |  | 2,882 |
Earnings/(loss) attributable to common shareholders | 445 |  | 1,071 |  | (90 | ) | 1,089 |  | 2,515 |
Earnings/(loss) per common share |  |  |  |  |
Basic | 0.26 |  | 0.63 |  | (0.05 | ) | 0.60 |  | 1.46 |
Diluted | 0.26 |  | 0.63 |  | (0.05 | ) | 0.60 |  | 1.46 |

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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=118952077&loc=d3e1280-108306 + Details
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