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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 Information |
| Q1 | Q2 | Q3 | Q4 | Total
(unaudited; millions of Canadian dollars, except per share amounts) |  |  |  |  |
2020 |  |  |  |  |
Operating revenues | 12,013 |  | 7,956 |  | 9,110 |  | 10,008 |  | 39,087 |
Operating income | 1,513 |  | 2,098 |  | 2,095 |  | 2,251 |  | 7,957 |
Earnings/(loss) | (1,364) |  | 1,777 |  | 1,104 |  | 1,899 |  | 3,416 |
Earnings/(loss) attributable to controlling interests | (1,333) |  | 1,741 |  | 1,084 |  | 1,871 |  | 3,363 |
Earnings/(loss) attributable to common shareholders | (1,429) |  | 1,647 |  | 990 |  | 1,775 |  | 2,983 |
Earnings/(loss) per common share |  |  |  |  |
Basic | (0.71) |  | 0.82 |  | 0.49 |  | 0.88 |  | 1.48 |
Diluted | (0.71) |  | 0.82 |  | 0.49 |  | 0.88 |  | 1.48 |
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 |

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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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