CONSOLIDATED STATEMENTS OF EARNINGS - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating revenues
Commodity sales	CAD 26,286	CAD 22,816	CAD 23,842
Gas distribution sales	4,215	2,486	3,096
Transportation and other services	13,877	9,258	6,856
Total operating revenues	44,378	34,560	33,794
Operating expenses
Commodity costs	26,065	22,409	22,949
Gas distribution costs	2,572	1,596	2,292
Operating and administrative	6,442	4,358	4,131
Depreciation and amortization	3,163	2,240	2,024
Impairment of long-lived assets (Note 7 and Note 10)	4,463	1,376	96
Impairment of goodwill (Note 7 and Note 15)	102	0	440
Total operating expenses	42,807	31,979	31,932
Operating income	1,571	2,581	1,862
Income from equity investments (Note 12)	1,102	428	475
Net foreign currency gain/(loss)	237	91	(884)
Gain on dispositions	16	848	94
Other	199	93	88
Interest expense (Note 17)	(2,556)	(1,590)	(1,624)
Earnings before income taxes	569	2,451	11
Income tax recovery/(expense) (Note 24)	2,697	(142)	(170)
Earnings/(loss)	3,266	2,309	(159)
(Earnings)/loss attributable to noncontrolling interests and redeemable noncontrolling interests	(407)	(240)	410
Earnings attributable to controlling interests	2,859	2,069	251
Preference share dividends	(330)	(293)	(288)
Earnings/(loss) attributable to common shareholders	CAD 2,529	CAD 1,776	CAD (37)
Earnings/(loss) per common share attributable to Enbridge Inc. common shareholders (in dollars per share)	CAD 1.66	CAD 1.95	CAD (0.04)
Diluted earnings/(loss) per common share attributable to Enbridge Inc. common shareholders (in dollars per share)	CAD 1.65	CAD 1.93	CAD (0.04)