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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)
 12 Months Ended
Dec. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of changes in AOCI attributable to Enbridge common shareholders
 
Changes in AOCI attributable to our common shareholders for the years ended December 31, 2017, 2016 and 2015 are as follows:
 
 
Cash Flow
Hedges

Net
Investment
Hedges

Cumulative
Translation
Adjustment

Equity
Investees

Pension and
OPEB
Adjustment

Total

(millions of Canadian dollars)
 

 

 

 

 

 

Balance at January 1, 2017
(746
)
(629
)
2,700

37

(304
)
1,058

Other comprehensive income/(loss) retained in AOCI
1

478

(2,623
)
(11
)
18

(2,137
)
Other comprehensive (income)/loss reclassified to earnings
 

 

 

 

 

 

Interest rate contracts1
207

—

—

—

—

207

Commodity contracts2
(7
)
—

—

—

—

(7
)
Foreign exchange contracts3
(6
)
—

—

—

—

(6
)
Other contracts4
(6
)
—

—

—

—

(6
)
 Amortization of pension and OPEB actuarial loss and prior service costs5
—

—

—

—

41

41

 
189

478

(2,623
)
(11
)
59

(1,908
)
Tax impact
 

 

 

 

 

 

Income tax on amounts retained in AOCI
(16
)
12

—

(16
)
(10
)
(30
)
Income tax on amounts reclassified to earnings
(71
)
—

—

—

(22
)
(93
)
 
(87
)
12

—

(16
)
(32
)
(123
)
Balance at December 31, 2017
(644
)
(139
)
77

10

(277
)
(973
)
 
Cash Flow
Hedges

Net
Investment
Hedges

Cumulative
Translation
Adjustment

Equity
Investees

Pension and
OPEB
Adjustment

Total

(millions of Canadian dollars)
 
 
 
 
 
 
Balance at January 1, 2016
(688
)
(795
)
3,365

37

(287
)
1,632

Other comprehensive income/(loss) retained in AOCI
(216
)
171

(665
)
(5
)
(45
)
(760
)
Other comprehensive (income)/loss reclassified to earnings
 
 
 
 
 
 
Interest rate contracts1
147

—

—

—

—

147

Commodity contracts2
(11
)
—

—

—

—

(11
)
Foreign exchange contracts3
1

—

—

—

—

1

Other contracts4
(18
)
—

—

—

—

(18
)
 Amortization of pension and OPEB actuarial loss and prior service costs5
—

—

—

—

21

21

 
(97
)
171

(665
)
(5
)
(24
)
(620
)
Tax impact
 
 
 
 
 
 
Income tax on amounts retained in AOCI
91

(5
)
—

5

11

102

Income tax on amounts reclassified to earnings
(52
)
—

—

—

(4
)
(56
)
 
39

(5
)
—

5

7

46

Balance at December 31, 2016
(746
)
(629
)
2,700

37

(304
)
1,058

 
 
Cash Flow
Hedges

Net
Investment
Hedges

Cumulative
Translation
Adjustment

Equity
Investees

Pension and
OPEB
Adjustment

Total

(millions of Canadian dollars)
 
 
 
 
 
 
Balance at January 1, 2015
(488
)
108

309

(5
)
(359
)
(435
)
Other comprehensive income/(loss) retained in AOCI
73

(952
)
3,056

47

65

2,289

Other comprehensive (income)/loss reclassified to earnings
 
 
 
 
 
 
Interest rate contracts1
(34
)
—

—

—

—

(34
)
Commodity contracts2
(11
)
—

—

—

—

(11
)
Foreign exchange contracts3
7

—

—

—

—

7

Other contracts4
26

—

—

—

—

26

 Amortization of pension and OPEB actuarial loss and prior service costs5
—

—

—

—

32

32

Other comprehensive income reclassified to earnings of derecognized cash flow hedges
(338
)
—

—

—

—

(338
)
 
(277
)
(952
)
3,056

47

97

1,971

Tax impact
 
 
 
 
 
 
Income tax on amounts retained in AOCI
(29
)
49

—

(5
)
(14
)
1

Income tax on amounts reclassified to earnings
15

—

—

—

(11
)
4

Income tax on amounts reclassified to earnings of derecognized cash flow hedges
91

—

—

—

—

91

 
77

49

—

(5
)
(25
)
96

Balance at December 31, 2015
(688
)
(795
)
3,365

37

(287
)
1,632

1
Reported within Interest expense in the Consolidated Statements of Earnings.
2
Reported within Commodity costs in the Consolidated Statements of Earnings.
3
Reported within Other income/(expense) in the Consolidated Statements of Earnings.
4
Reported within Operating and administrative expense in the Consolidated Statements of Earnings.
5
These components are included in the computation of net benefit costs and are reported within Operating and administrative expense in the Consolidated Statements of Earnings.