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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)
 3 Months Ended
Mar. 31, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of changes in AOCI attributable to Enbridge Inc. common shareholders
Changes in Accumulated other comprehensive income (AOCI) attributable to our common shareholders for the three months ended March 31, 2018 and 2017 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, 2018
(644
)
(139
)
77

10

(277
)
(973
)
Other comprehensive income/(loss) retained in AOCI
70

(213
)
1,425

2

—

1,284

Other comprehensive (income)/loss reclassified to earnings
 
 
 
 
 


Interest rate contracts1
28

—

—

—

—

28

Commodity contracts2
(1
)
—

—

—

—

(1
)
Foreign exchange contracts3
4

—

—

—

—

4

Other contracts4
9

—

—

—

—

9

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

—

—

—

(38
)
(38
)
 
110

(213
)
1,425

2

(38
)
1,286

Tax impact
 

 

 

 

 

 

Income tax on amounts retained in AOCI
(9
)
29

—

8

—

28

Income tax on amounts reclassified to earnings
(11
)
—

—

—

(1
)
(12
)
 
(20
)
29

—

8

(1
)
16

Balance at March 31, 2018
(554
)
(323
)
1,502

20

(316
)
329

 
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
)
50

293

5

—

347

Other comprehensive (income)/loss reclassified to earnings
 
 
 
 
 


Interest rate contracts1
31

—

—

—

—

31

Commodity contracts2
(2
)
—

—

—

—

(2
)
Other contracts4
9

—

—

—

—

9

Amortization of pension and OPEB actuarial loss and prior service costs5

—

—

—

—

6

6

 
37

50

293

5

6

391

Tax impact
 
 
 
 
 
 
Income tax on amounts retained in AOCI
(1
)
(1
)
—

1

—

(1
)
Income tax on amounts reclassified to earnings
(8
)
—

—

—

(2
)
(10
)
 
(9
)
(1
)
—

1

(2
)
(11
)
Balance at March 31, 2017
(718
)
(580
)
2,993

43

(300
)
1,438

 
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 periodic benefit costs and are reported within Other income/(expense) in the Consolidated Statements of Earnings.