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CONSOLIDATED STATEMENTS OF EARNINGS - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenues |  |  |
Commodity sales | CAD 22,816 | CAD 23,842 | CAD 28,281
Gas distribution sales | 2,486 | 3,096 | 2,853
Transportation and other services | 9,258 | 6,856 | 6,507
Total revenues | 34,560 | 33,794 | 37,641
Expenses |  |  |
Commodity costs | 22,409 | 22,949 | 27,504
Gas distribution costs | 1,596 | 2,292 | 1,979
Operating and administrative | 4,360 | 4,152 | 3,281
Depreciation and amortization | 2,240 | 2,024 | 1,577
Environmental costs, net of recoveries | (2) | (21) | 100
Impairment of property, plant and equipment (Note 9) | 1,376 | 96 |
Goodwill impairment (Note 15) | 0 | 440 |
Total expenses | 31,979 | 31,932 | 34,441
Total operating income | 2,581 | 1,862 | 3,200
Income from equity investments (Note 11) | 428 | 475 | 368
Other income/(expense) (Note 27) | 1,032 | (702) | (266)
Interest expense (Note 17) | (1,590) | (1,624) | (1,129)
Earnings from continuing operations before income taxes | 2,451 | 11 | 2,173
Income taxes (Note 25) | (142) | (170) | (611)
Earnings/(loss) from continuing operations | 2,309 | (159) | 1,562
Discontinued Operations |  |  |
Earnings from discontinued operations before income taxes |  |  | 73
Income taxes from discontinued operations |  |  | (27)
Earnings from discontinued operations |  |  | 46
Earnings/(loss) | 2,309 | (159) | 1,608
(Earnings)/loss attributable to noncontrolling interests and redeemable noncontrolling interests | (240) | 410 | (203)
Earnings attributable to Enbridge Inc. | 2,069 | 251 | 1,405
Preference share dividends | (293) | (288) | (251)
Earnings/(loss) attributable to Enbridge Inc. common shareholders | 1,776 | (37) | 1,154
Earnings/(loss) attributable to Enbridge Inc. common shareholders |  |  |
Earnings/(loss) from continuing operations | 1,776 | (37) | 1,108
Earnings from discontinued operations, net of tax |  |  | 46
Earnings/(loss) attributable to Enbridge Inc. common shareholders | CAD 1,776 | CAD (37) | CAD 1,154
Earnings/(loss) per common share attributable to Enbridge Inc. common shareholders |  |  |
Continuing operations (in Canadian dollars per share) | CAD 1.95 | CAD (0.04) | CAD 1.34
Discontinued operations (in Canadian dollars per share) |  |  | 0.05
Total earnings/(loss) per common share (in Canadian dollars per share) | 1.95 | (0.04) | 1.39
Diluted earnings/(loss) per common share attributable to Enbridge Inc. common shareholders |  |  |
Continuing operations (in Canadian dollars per share) | 1.93 | (0.04) | 1.32
Discontinued operations (in Canadian dollars per share) |  |  | 0.05
Total diluted earnings/(loss) per common share (in Canadian dollars per share) | CAD 1.93 | CAD (0.04) | CAD 1.37

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- Definition Total costs incurred and are directly related to energy commodities and services provided during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(d),(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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