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CONSOLIDATED STATEMENTS OF EARNINGS - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenues |  |  |
Commodity sales | CAD 23,842 | CAD 28,281 | CAD 26,039
Gas distribution sales | 3,096 | 2,853 | 2,265
Transportation and other services | 6,856 | 6,507 | 4,614
Total revenues | 33,794 | 37,641 | 32,918
Expenses |  |  |
Commodity costs | 22,949 | 27,504 | 25,222
Gas distribution costs | 2,292 | 1,979 | 1,585
Operating and administrative | 4,248 | 3,281 | 3,014
Depreciation and amortization | 2,024 | 1,577 | 1,370
Environmental costs, net of recoveries | (21) | 100 | 362
Goodwill impairment (Note 15) | 440 | 0 | 0
Total expenses | 31,932 | 34,441 | 31,553
Total operating income | 1,862 | 3,200 | 1,365
Income from equity investments (Note 11) | 475 | 368 | 330
Other expense (Note 27) | (702) | (266) | (135)
Interest expense (Note 17) | (1,624) | (1,129) | (947)
Earnings from continuing operations before income taxes | 11 | 2,173 | 613
Income taxes (Note 25) | (170) | (611) | (123)
Earnings/(loss) from continuing operations | (159) | 1,562 | 490
Discontinued operations (Note 9) |  |  |
Earnings from discontinued operations before income taxes |  | 73 | 6
Income taxes from discontinued operations |  | (27) | (2)
Earnings from discontinued operations |  | 46 | 4
Earnings/(loss) | (159) | 1,608 | 494
(Earnings)/loss attributable to noncontrolling interests and redeemable noncontrolling interests | 410 | (203) | 135
Earnings attributable to Enbridge Inc. | 251 | 1,405 | 629
Preference share dividends | (288) | (251) | (183)
Earnings/(loss) attributable to Enbridge Inc. common shareholders | (37) | 1,154 | 446
Earnings/(loss) attributable to Enbridge Inc. common shareholders |  |  |
Earnings/(loss) from continuing operations | (37) | 1,108 | 442
Earnings from discontinued operations, net of tax |  | 46 | 4
Earnings/(loss) attributable to Enbridge Inc. common shareholders | CAD (37) | CAD 1,154 | CAD 446
Earnings/(loss) per common share attributable to Enbridge Inc. common shareholders (Note 21) |  |  |
Continuing operations (in Canadian dollars per share) | CAD (0.04) | CAD 1.34 | CAD 0.55
Discontinued operations (in Canadian dollars per share) |  | 0.05 |
Total earnings per common share (in Canadian dollars per share) | (0.04) | 1.39 | 0.55
Diluted earnings/(loss) per common share attributable to Enbridge Inc. common shareholders (Note 21) |  |  |
Continuing operations (in Canadian dollars per share) | (0.04) | 1.32 | 0.55
Discontinued operations (in Canadian dollars per share) |  | 0.05 |
Total diluted earnings per common share (in Canadian dollars per share) | CAD (0.04) | CAD 1.37 | CAD 0.55

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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=26872669&loc=d3e20235-122688 + Details
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