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CONSOLIDATED STATEMENTS OF EARNINGS - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating revenues |  |  |  |  |  |  |  |  |  |  |
Total operating revenues (Note 4) | $ 12,352 | $ 11,598 | $ 13,263 | $ 12,856 | $ 11,562 | $ 11,345 | $ 10,745 | $ 12,726 | $ 50,069 | $ 46,378 | $ 44,378
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Operating and administrative |  |  |  |  |  |  |  |  | 6,991 | 6,792 | 6,442
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,391 | 3,246 | 3,163
Impairment of long-lived assets (Note 8 and Note 11) |  |  |  |  |  |  |  |  | 423 | 1,104 | 4,463
Impairment of goodwill (Note 8 and Note 16) |  |  |  |  |  |  |  |  | 0 | 1,019 | 102
Total operating expenses |  |  |  |  |  |  |  |  | 41,809 | 41,562 | 42,807
Operating income | 1,768 | 1,588 | 2,285 | 2,619 | 1,513 | 854 | 1,571 | 878 | 8,260 | 4,816 | 1,571
Income from equity investments (Note 13) |  |  |  |  |  |  |  |  | 1,503 | 1,509 | 1,102
Other income/(expense) |  |  |  |  |  |  |  |  |  |  |
Net foreign currency gain/(loss) |  |  |  |  |  |  |  |  | 477 | (522) | 237
Gain/(loss) on dispositions |  |  |  |  |  |  |  |  | (300) | (46) | 16
Other |  |  |  |  |  |  |  |  | 258 | 516 | 199
Interest expense (Note 18) |  |  |  |  |  |  |  |  | (2,663) | (2,703) | (2,556)
Earnings before income taxes |  |  |  |  |  |  |  |  | 7,535 | 3,570 | 569
Income tax recovery/(expense) (Note 25) |  |  |  |  |  |  |  |  | (1,708) | (237) | 2,697
Earnings | 914 | 1,060 | 1,830 | 2,023 | 1,283 | 213 | 1,327 | 510 | 5,827 | 3,333 | 3,266
Earnings attributable to noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  | (122) | (451) | (407)
Earnings attributable to controlling interests | 842 | 1,045 | 1,832 | 1,986 | 1,184 | 4 | 1,160 | 534 | 5,705 | 2,882 | 2,859
Preference share dividends |  |  |  |  |  |  |  |  | (383) | (367) | (330)
Earnings attributable to common shareholders | $ 746 | $ 949 | $ 1,736 | $ 1,891 | $ 1,089 | $ (90) | $ 1,071 | $ 445 | $ 5,322 | $ 2,515 | $ 2,529
Earnings per common share attributable to common shareholders (in CAD per share) | $ 0.37 | $ 0.47 | $ 0.86 | $ 0.94 | $ 0.60 | $ (0.05) | $ 0.63 | $ 0.26 | $ 2.64 | $ 1.46 | $ 1.66
Diluted earnings per common share attributable to common shareholders (in CAD per share) | $ 0.36 | $ 0.47 | $ 0.86 | $ 0.94 | $ 0.60 | $ (0.05) | $ 0.63 | $ 0.26 | $ 2.63 | $ 1.46 | $ 1.65
Commodity sales |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |
Total operating revenues (Note 4) |  |  |  |  |  |  |  |  | $ 29,309 | $ 27,660 | $ 26,286
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  |  |  |  |  |  | 28,802 | 26,818 | 26,065
Gas distribution revenue |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |
Total operating revenues (Note 4) |  |  |  |  |  |  |  |  | 4,205 | 4,360 | 4,215
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  |  |  |  |  |  | 2,202 | 2,583 | 2,572
Transportation and other services revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |
Total operating revenues (Note 4) |  |  |  |  |  |  |  |  | $ 16,555 | $ 14,358 | $ 13,877

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