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CONSOLIDATED STATEMENTS OF EARNINGS - CAD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Operating revenues |  |
Commodity sales | $ 7,268 | $ 6,866
Gas distribution sales | 1,926 | 1,363
Transportation and other services | 3,532 | 2,917
Total operating revenues (Note 3) | 12,726 | 11,146
Operating expenses |  |
Commodity costs | 6,997 | 6,550
Gas distribution costs | 1,324 | 1,015
Operating and administrative | 1,641 | 1,551
Depreciation and amortization | 824 | 672
Asset impairment (Note 6) | 1,062 | 0
Total operating expenses | 11,848 | 9,788
Operating income | 878 | 1,358
Income from equity investments | 335 | 236
Other income/(expense) |  |
Net foreign currency loss | (185) | (5)
Other | 65 | 40
Interest expense | (656) | (486)
Earnings before income taxes | 437 | 1,143
Income tax recovery/(expense) (Note 11) | 73 | (198)
Earnings | 510 | 945
(Earnings)/loss attributable to noncontrolling interests and redeemable noncontrolling interests | 24 | (224)
Earnings attributable to controlling interests | 534 | 721
Preference share dividends | (89) | (83)
Earnings attributable to common shareholders | $ 445 | $ 638
Earnings per common share attributable to common shareholders (Note 5) (in Canadian dollars per share) | $ 0.26 | $ 0.54
Diluted earnings per common share attributable to common shareholders (Note 5) (in Canadian dollars per share) | $ 0.26 | $ 0.54

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