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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables) | 3 Months Ended
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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 contracts 1 | 28 |  | — |  | — |  | — |  | — |  | 28 |
Commodity contracts 2 | (1 | ) | — |  | — |  | — |  | — |  | (1 | )
Foreign exchange contracts 3 | 4 |  | — |  | — |  | — |  | — |  | 4 |
Other contracts 4 | 9 |  | — |  | — |  | — |  | — |  | 9 |
Amortization of pension and OPEB actuarial loss and prior service costs 5 | — |  | — |  | — |  | — |  | (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 contracts 1 | 31 |  | — |  | — |  | — |  | — |  | 31 |
Commodity contracts 2 | (2 | ) | — |  | — |  | — |  | — |  | (2 | )
Other contracts 4 | 9 |  | — |  | — |  | — |  | — |  | 9 |
Amortization of pension and OPEB actuarial loss and prior service costs 5 | — |  | — |  | — |  | — |  | 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.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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