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CONSOLIDATED STATEMENTS OF EARNINGS - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Operating revenues |  |  |  |
Total operating revenues (Note 3) | $ 10,745 | $ 11,116 | $ 23,471 | $ 22,262
Operating expenses |  |  |  |
Commodity costs | 6,278 | 6,489 | 13,275 | 13,039
Gas distribution costs | 421 | 429 | 1,745 | 1,444
Operating and administrative | 1,636 | 1,646 | 3,277 | 3,197
Depreciation and amortization | 829 | 868 | 1,653 | 1,540
Asset impairment (Note 6) | 10 | 0 | 1,072 | 0
Total operating expenses | 9,174 | 9,432 | 21,022 | 19,220
Operating income | 1,571 | 1,684 | 2,449 | 3,042
Income from equity investments | 363 | 236 | 698 | 472
Other income/(expense) |  |  |  |
Net foreign currency gain/(loss) | (43) | 112 | (228) | 107
Other | 29 | 67 | 94 | 107
Interest expense | (690) | (565) | (1,346) | (1,051)
Earnings before income taxes | 1,230 | 1,534 | 1,667 | 2,677
Income tax recovery/(expense) (Note 12) | 97 | (293) | 170 | (491)
Earnings | 1,327 | 1,241 | 1,837 | 2,186
Earnings attributable to noncontrolling interests and redeemable noncontrolling interests | (167) | (241) | (143) | (465)
Earnings attributable to controlling interests | 1,160 | 1,000 | 1,694 | 1,721
Preference share dividends | (89) | (81) | (178) | (164)
Earnings attributable to common shareholders | $ 1,071 | $ 919 | $ 1,516 | $ 1,557
Earnings per common share attributable to common shareholders (Note 5) (in Canadian dollars per share) | $ 0.63 | $ 0.56 | $ 0.90 | $ 1.11
Diluted earnings per common share attributable to common shareholders (Note 5) (in Canadian dollars per share) | $ 0.63 | $ 0.56 | $ 0.90 | $ 1.10
Commodity sales |  |  |  |
Operating revenues |  |  |  |
Total operating revenues (Note 3) | $ 6,451 | $ 6,620 | $ 13,719 | $ 13,486
Gas Distribution Revenue |  |  |  |
Operating revenues |  |  |  |
Total operating revenues (Note 3) | 856 | 847 | 2,782 | 2,210
Transportation and other services revenues |  |  |  |
Operating revenues |  |  |  |
Total operating revenues (Note 3) | $ 3,438 | $ 3,649 | $ 6,970 | $ 6,566

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