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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
The components of accumulated other comprehensive income are as follows:
millions of Canadian dollars | Unrealized (loss) gain on translation of self-sustaining foreign operations | Net change in net investment hedges | (Losses) gains on derivatives recognized as cash flow hedges | Net change on available-for-sale investments | Net change in unrecognized pension and post-retirement benefit costs | Total AOCI
For the year ended December 31, 2017
Balance, January 1, 2017 | $ | 486 | $ | (49) | $ | (21) | $ | (1) | $ | (309) | $ | 106
Other comprehensive income (loss) before reclassifications |  | (457) |  | 97 |  | 10 |  | 5 |  | - |  | (345)
Amounts reclassified from accumulated other comprehensive income loss |  | - |  | - |  | 8 |  | (1) |  | 44 |  | 51
Net current period other comprehensive income (loss) |  | (457) |  | 97 |  | 18 |  | 4 |  | 44 |  | (294)
Other |  | - |  | - |  | - |  | - |  | - |  | -
Balance, December 31, 2017 | $ | 29 | $ | 48 | $ | (3) | $ | 3 | $ | (265) | $ | (188)
millions of Canadian dollars | Unrealized (loss) gain on translation of self-sustaining foreign operations | Net change in net investment hedges | (Losses) gains on derivatives recognized as cash flow hedges | Net change on available-for-sale investments | Net change in unrecognized pension and post-retirement benefit costs | Total AOCI
For the year ended December 31, 2016
Balance, January 1, 2016 | $ | 490 | $ | - | $ | (35) | $ | - | $ | (318) | $ | 137
Other comprehensive income (loss) before reclassifications |  | 35 |  | (49) |  | 11 |  | 3 |  | - |  | -
Amounts reclassified from accumulated other comprehensive income loss (gain) |  | - |  | - |  | 11 |  | (4) |  | 12 |  | 19
Equity method reclassification adjustments |  | (35) |  | - |  | (8) |  | - |  | (3) |  | (46)
Net current period other comprehensive income (loss) |  | - |  | (49) |  | 14 |  | (1) |  | 9 |  | (27)
Other |  | (4) |  | - |  | - |  | - |  | - |  | (4)
Balance, December 31, 2016 | $ | 486 | $ | (49) | $ | (21) | $ | (1) | $ | (309) | $ | 106
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] |
The reclassifications out of accumulated other comprehensive income (loss) are as follows:
For the |  | Year ended December 31
millions of Canadian dollars |  |  | 2017 |  | 2016
| Affected line item in the Consolidated Financial Statements |  | Amounts reclassified from AOCI
Equity method reclassification adjustments |  |  |  |  |
| Investments subject to significant influence | $ | - | $ | 54
Total before tax |  |  | - |  | 54
| Deferred income taxes |  | - |  | (8)
Total net of tax |  | $ | - | $ | 46
Losses (gain) on derivatives recognized as cash flow hedges |  |  |  |  |
Power and gas swaps | Non-regulated fuel for generation and purchased power | $ | (3) | $ | (2)
Interest rate swaps | Income from equity investments |  | - |  | 1
Foreign exchange forwards | Operating revenue - regulated |  | 10 |  | 12
Total before tax |  |  | 7 |  | 11
| Income tax recovery (expense) |  | 1 |  | -
Total net of tax |  | $ | 8 | $ | 11
Net change in available-for-sale investments |  |  |  |  |
| Other income (expenses), net | $ | (1) | $ | (4)
Total before tax |  |  | (1) |  | (4)
| Income tax recovery (expense) |  | - |  | -
Total net of tax |  | $ | (1) | $ | (4)
Net change in unrecognized pension and post-retirement benefit costs |  |  |  |  |
Actuarial losses (gains) | Operating, maintenance and general (“OM&G”) | $ | 40 | $ | 41
Past service costs (gains) | OM&G |  | (8) |  | (9)
Amounts reclassified into obligations | Pension and post-retirement benefits |  | 11 |  | (17)
Total before tax |  |  | 43 |  | 15
| Income tax recovery (expense) |  | 1 |  | (3)
Total net of tax |  | $ | 44 | $ | 12
Total reclassifications out of AOCI, net of tax, for the period |  | $ | 51 | $ | 65

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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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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