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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables) | 6 Months Ended
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Jun. 30, 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 six months ended June 30, 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 as at January 1, 2018 | (644 | ) | (139 | ) | 77 |  | 10 |  | (277 | ) | (973 | )
Other comprehensive income/(loss) retained in AOCI | 100 |  | (328 | ) | 2,354 |  | 3 |  | — |  | 2,129 |
Other comprehensive (income)/loss reclassified to earnings |  |  |  |  |  |  |
Interest rate contracts 1 | 67 |  | — |  | — |  | — |  | — |  | 67 |
Commodity contracts 2 | (1 | ) | — |  | — |  | — |  | — |  | (1 | )
Foreign exchange contracts 3 | 5 |  | — |  | — |  | — |  | — |  | 5 |
Other contracts 4 | 3 |  | — |  | — |  | — |  | — |  | 3 |
Amortization of pension and OPEB actuarial loss and prior service costs 5 | — |  | — |  | — |  | — |  | 31 |  | 31 |
| 174 |  | (328 | ) | 2,354 |  | 3 |  | 31 |  | 2,234 |
Tax impact |  |  |  |  |  |  |  |  |  |  |  |
Income tax on amounts retained in AOCI | (13 | ) | 45 |  | — |  | 10 |  | — |  | 42 |
Income tax on amounts reclassified to earnings | (18 | ) | — |  | — |  | — |  | (8 | ) | (26 | )
| (31 | ) | 45 |  | — |  | 10 |  | (8 | ) | 16 |
Balance as at June 30, 2018 | (501 | ) | (422 | ) | 2,431 |  | 23 |  | (254 | ) | 1,277 |
| Cash Flow Hedges |  | Net Investment Hedges |  | Cumulative Translation Adjustment |  | Equity Investees |  | Pension and OPEB Adjustment |  | Total |
(millions of Canadian dollars) |  |  |  |  |  |
Balance as at January 1, 2017 | (746 | ) | (629 | ) | 2,700 |  | 37 |  | (304 | ) | 1,058 |
Other comprehensive income/(loss) retained in AOCI | (44 | ) | 222 |  | (899 | ) | 3 |  | — |  | (718 | )
Other comprehensive (income)/loss reclassified to earnings |  |  |  |  |  |  |
Interest rate contracts 1 | 71 |  | — |  | — |  | — |  | — |  | 71 |
Commodity contracts 2 | (4 | ) | — |  | — |  | — |  | — |  | (4 | )
Foreign exchange contracts 3 | 2 |  | — |  | — |  | — |  | — |  | 2 |
Amortization of pension and OPEB actuarial loss and prior service costs 5 | — |  | — |  | — |  | — |  | 10 |  | 10 |
| 25 |  | 222 |  | (899 | ) | 3 |  | 10 |  | (639 | )
Tax impact |  |  |  |  |  |
Income tax on amounts retained in AOCI | 12 |  | (2 | ) | — |  | 5 |  | — |  | 15 |
Income tax on amounts reclassified to earnings | (23 | ) | — |  | — |  | — |  | (3 | ) | (26 | )
| (11 | ) | (2 | ) | — |  | 5 |  | (3 | ) | (11 | )
Balance as at June 30, 2017 | (732 | ) | (409 | ) | 1,801 |  | 45 |  | (297 | ) | 408 |
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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