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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - CAD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 13,424 | $ 11,573 | $ 13,215 | $ 15,097 | $ 12,470 | $ 11,466 | $ 10,948 | $ 12,187 | $ 53,309 | $ 47,071 | $ 39,087
Operating income/(loss) | (540) | 1,778 | 1,520 | 2,420 | 2,053 | 1,388 | 1,816 | 2,548 | 5,178 | 7,805 | 7,957
Earnings | (1,109) | 1,383 | 607 | 2,057 | 1,965 | 814 | 1,521 | 2,014 | 2,938 | 6,314 | 3,416
Earnings/(loss) attributable to controlling interests | (983) | 1,362 | 595 | 2,029 | 1,933 | 780 | 1,484 | 1,992 | 3,003 | 6,189 | 3,363
Earnings/(loss) attributable to common shareholders | $ (1,067) | $ 1,279 | $ 450 | $ 1,927 | $ 1,840 | $ 682 | $ 1,394 | $ 1,900 | $ 2,589 | $ 5,816 | $ 2,983
Earnings/(loss) per common share |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) per common share attributable to common shareholders (in CAD per share) | $ (0.53) | $ 0.63 | $ 0.22 | $ 0.95 | $ 0.91 | $ 0.34 | $ 0.69 | $ 0.94 | $ 1.28 | $ 2.87 | $ 1.48
Diluted earnings per common share attributable to common shareholders (in CAD per share) | $ (0.53) | $ 0.63 | $ 0.22 | $ 0.95 | $ 0.91 | $ 0.34 | $ 0.69 | $ 0.94 | $ 1.28 | $ 2.87 | $ 1.48

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