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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Measurements [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
As at |  | December 31, 2017
millions of Canadian dollars |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |
Cash flow hedges |  |  |  |  |  |  |  |
Power swaps | $ | 5 | $ | - | $ | - | $ | 5
Foreign exchange forwards |  | - |  | 2 |  | - |  | 2
|  | 5 |  | 2 |  | - |  | 7
Regulatory deferral |  |  |  |  |  |  |  |
Commodity swaps and forwards |  |  |  |  |  |  |  |
Coal purchases |  | - |  | 127 |  | - |  | 127
Power purchases |  | 5 |  | - |  | - |  | 5
Natural gas purchases and sales |  | - |  | 5 |  | - |  | 5
Heavy fuel oil purchases |  | 4 |  | 8 |  | - |  | 12
Foreign exchange forwards |  | - |  | 32 |  | - |  | 32
|  | 9 |  | 172 |  | - |  | 181
HFT derivatives |  |  |  |  |  |  |  |
Power swaps and physical contracts |  | - |  | 3 |  | 9 |  | 12
Natural gas swaps, futures, forwards, physical contracts and related transportation |  | - |  | 26 |  | 25 |  | 51
|  | - |  | 29 |  | 34 |  | 63
Other derivatives |  |  |  |  |  |  |  |
Interest rate swap |  | - |  | 2 |  | - |  | 2
|  | - |  | 2 |  | - |  | 2
Total assets |  | 14 |  | 205 |  | 34 |  | 253
Liabilities |  |  |  |  |  |  |  |
Cash flow hedges |  |  |  |  |  |  |  |
Power swaps |  | 2 |  | - |  | - |  | 2
Foreign exchange forwards |  | - |  | 5 |  | - |  | 5
|  | 2 |  | 5 |  | - |  | 7
Regulatory deferral |  |  |  |  |  |  |  |
Commodity swaps and forwards |  |  |  |  |  |  |  |
Power purchases |  | 3 |  | - |  | - |  | 3
Natural gas purchases and sales |  | 5 |  | 1 |  | - |  | 6
Foreign exchange forwards |  | - |  | 4 |  | - |  | 4
|  | 8 |  | 5 |  | - |  | 13
HFT derivatives |  |  |  |  |  |  |  |
Power swaps and physical contracts |  | 49 |  | 5 |  | (4) |  | 50
Natural gas swaps, futures, forwards and physical contracts |  | 6 |  | 47 |  | 187 |  | 240
|  | 55 |  | 52 |  | 183 |  | 290
Total liabilities |  | 65 |  | 62 |  | 183 |  | 310
Net assets (liabilities) | $ | (51) | $ | 143 | $ | (149) | $ | (57)
As at |  | December 31, 2016
millions of Canadian dollars |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |
Cash flow hedges |  |  |  |  |  |  |  |
Power swaps | $ | 10 | $ | - | $ | - | $ | 10
|  | 10 |  | - |  | - |  | 10
Regulatory deferral |  |  |  |  |  |  |  |
Commodity swaps and forwards |  |  |  |  |  |  |  |
Coal purchases |  | - |  | 74 |  | - |  | 74
Power purchases |  | 7 |  | - |  | - |  | 7
Natural gas purchases and sales |  | 8 |  | 25 |  | - |  | 33
Heavy fuel oil purchases |  | 3 |  | 5 |  | 1 |  | 9
Foreign exchange forwards |  | - |  | 106 |  | - |  | 106
|  | 18 |  | 210 |  | 1 |  | 229
HFT derivatives |  |  |  |  |  |  |  |
Power swaps and physical contracts |  | (7) |  | 1 |  | - |  | (6)
Natural gas swaps, futures, forwards, physical contracts and related transportation |  | - |  | 4 |  | 39 |  | 43
|  | (7) |  | 5 |  | 39 |  | 37
Total assets |  | 21 |  | 215 |  | 40 |  | 276
Liabilities |  |  |  |  |  |  |  |
Cash flow hedges |  |  |  |  |  |  |  |
Power swaps |  | 4 |  | - |  | - |  | 4
Foreign exchange forwards |  | - |  | 23 |  | - |  | 23
|  | 4 |  | 23 |  | - |  | 27
Regulatory deferral |  |  |  |  |  |  |  |
Power purchases |  | 4 |  | - |  | - |  | 4
Heavy fuel oil purchases |  | - |  | 6 |  | - |  | 6
Natural gas purchases and sales |  | 1 |  | 1 |  | - |  | 2
|  | 5 |  | 7 |  | - |  | 12
HFT derivatives |  |  |  |  |  |  |  |
Power swaps and physical contracts |  | 12 |  | 5 |  | - |  | 17
Natural gas swaps, futures, forwards and physical contracts |  | 4 |  | 24 |  | 389 |  | 417
|  | 16 |  | 29 |  | 389 |  | 434
Other derivatives |  |  |  |  |  |  |  |
Foreign exchange forwards |  | - |  | 1 |  | - |  | 1
Interest rate swaps |  | - |  | 1 |  | - |  | 1
|  | - |  | 2 |  | - |  | 2
Total liabilities |  | 25 |  | 61 |  | 389 |  | 475
Net assets (liabilities) | $ | (4) | $ | 154 | $ | (349) | $ | (199)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
The change in the fair value of the Level 3 financial assets for the year ended December 31, 2017 was as follows:
| Regulatory Deferral | HFT Derivatives
millions of Canadian dollars | Oil financial derivatives | Physical natural gas purchases and sales | Power | Natural gas | Total
Balance, January 1, 2017 | $ | 1 | $ | - | $ | - | $ | 39 | $ | 40
Increase (reduction) in benefit included in regulated fuel for generation and purchased power |  | - |  | (1) |  | - |  | - |  | (1)
Unrealized gains (losses) included in regulatory assets or liabilities |  | (1) |  | 1 |  | - |  | - |  | -
Total realized and unrealized gains (losses) included in non-regulated operating revenues |  | - |  | - |  | 9 |  | 1 |  | 10
Net transfers out of Level 3 |  | - |  | - |  | - |  | (15) |  | (15)
Balance, December 31, 2017 | $ | - | $ | - | $ | 9 | $ | 25 | $ | 34
The change in the fair value of the Level 3 financial liabilities for the year ended December 31, 2017 was as follows:
| Regulatory Deferral | HFT Derivatives
millions of Canadian dollars | Oil financial derivatives | Physical natural gas purchases and sales | Power | Natural gas | Total
Balance, January 1, 2017 | $ | - | $ | - | $ | - | $ | 389 | $ | 389
Increase (reduction) in benefit included in regulated fuel for generation and purchased power |  | - |  | (1) |  | - |  | - |  | (1)
Increase (reduction) in benefit included in non-regulated fuel for generation and purchased power |  | - |  | 1 |  | - |  | - |  | 1
Total realized and unrealized gains (losses) included in non-regulated operating revenues |  | - |  | - |  | (5) |  | (206) |  | (211)
Net transfers into Level 3 |  | - |  | - |  | 1 |  | 4 |  | 5
Balance, December 31, 2017 | $ | - | $ | - | $ | (4) | $ | 187 | $ | 183
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
As at |  | December 31, 2017
millions of Canadian dollars |  | Fair Value | Valuation Technique | Unobservable Input | Range | Weighted average
Assets |  |  |  |  |  |
HFT derivatives – |  | 1 | Modelled pricing | Third-party pricing | $24.88-$117.90 | $92.93
Power swaps and |  |  |  | Probability of default | 0.00%-0.01% | 0.00%
physical contracts |  |  |  | Discount rate | 0.00%-0.13% | 0.00%
|  | 8 | Modelled pricing | Third-party pricing | $63.48-$117.00 | $102.68
|  |  |  | Correlation factor | 0.94%-0.99% | 0.96%
|  |  |  | Probability of default | 0.00%-0.00% | 0.00%
|  |  |  | Discount rate | 0.00%-0.00% | 0.00%
HFT derivatives – |  | 18 | Modelled pricing | Third-party pricing | $2.06-$8.24 | $3.61
Natural gas swaps, futures, |  |  |  | Probability of default | 0.00%-0.05% | 0.00%
forwards, physical contracts |  |  |  | Discount rate | 0.00%-0.29% | 0.06%
and related transportation |  | 7 | Modelled pricing | Third-party pricing | $2.04-$12.52 | $6.42
|  |  |  | Basis adjustment | 0.08%-0.71% | 0.52%
|  |  |  | Probability of default | 0.00%-0.00% | 0.00%
|  |  |  | Discount rate | 0.00%-0.09% | 0.01%
Total assets | $ | 34 |  |  |  |
Liabilities |  |  |  |  |  |
HFT derivatives – | $ | (6) | Modelled pricing | Third-party pricing | $24.88-$117.90 | $95.46
Power swaps and |  |  |  | Own credit risk | 0.00%-0.01% | 0.00%
physical contracts |  |  |  | Discount rate | 0.00%-0.13% | 0.00%
|  | 2 | Modelled pricing | Third-party pricing | $94.5-$117.00 | $105.52
|  |  |  | Correlation factor | 0.94%-0.99% | 0.96%
|  |  |  | Probability of default | 0.00%-0.00% | 0.00%
|  |  |  | Discount rate | 0.00%-0.00% | 0.00%
HFT derivatives – |  | 172 | Modelled pricing | Third-party pricing | $1.89-$11.81 | $4.64
Natural gas swaps, futures, |  |  |  | Own credit risk | 0.00%-0.00% | 0.00%
forwards and physical contracts |  |  |  | Discount rate | 0.00%-0.12% | 0.02%
|  | 15 | Modelled pricing | Third-party pricing | $2.15-$12.52 | $8.94
|  |  |  | Basis adjustment | 0.08%-0.71% | 0.53%
|  |  |  | Own credit risk | 0.00%-0.00% | 0.00%
|  |  |  | Discount rate | 0.00%-0.08% | 0.01%
Total liabilities | $ | 183 |  |  |  |
Net assets (liabilities) | $ | (149) |  |  |  |
As at |  | December 31, 2016
millions of Canadian dollars |  | Fair Value | Valuation Technique | Unobservable Input | Range | Weighted average
Assets |  |  |  |  |  |
Regulatory deferral – Financial | $ | 1 | Modelled pricing | Third-party pricing | $69.64 | $69.64
oil derivatives |  |  |  | Probability of default | 0.80% | 0.80%
HFT derivatives – |  | 27 | Modelled pricing | Third-party pricing | $1.41 - $11.87 | $3.87
Natural gas swaps, |  |  |  | Probability of default | 0.00% - 0.07% | 0.01%
futures, forwards, |  |  |  | Discount rate | 0.00% - 0.32% | 0.05%
physical contracts |  | 12 | Modelled pricing | Third-party pricing | $1.83 - $11.87 | $6.16
and related transportation |  |  |  | Basis adjustment | (0.11)% - 0.64% | 0.39%
|  |  |  | Probability of default | 0.00% - 0.05% | 0.00%
|  |  |  | Discount rate | 0.00% - 0.10% | 0.00%
Total assets | $ | 40 |  |  |  |
Liabilities |  |  |  |  |  |
HFT derivatives – | $ | 386 | Modelled pricing | Third-party pricing | $1.55 - $11.87 | $6.26
Natural gas swaps, futures, |  |  |  | Own credit risk | 0.00% - 0.07% | 0.00%
forwards and physical contracts |  |  |  | Discount rate | 0.00% - 0.14% | 0.02%
|  | 3 | Modelled pricing | Third-party pricing | $1.83 - $11.87 | $5.93
|  |  |  | Basis adjustment | (0.11)% - 0.64% | 0.27%
|  |  |  | Own credit risk | 0.00% - 0.05% | 0.01%
|  |  |  | Discount rate | 0.00% - 0.10% | 0.01%
Total liabilities |  | 389 |  |  |  |
Net assets (liabilities) | $ | (349) |  |  |  |
Fair Value, Estimate Not Practicable [Table Text Block] |
The financial assets and liabilities included on the Consolidated Balance Sheets that are not measured at fair value consisted of the following:
As at |  |
millions of Canadian dollars |  | Carrying Amount |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
December 31, 2017 | $ | 13,881 | $ | 15,217 | $ | 69 | $ | 14,346 | $ | 802 | $ | 15,217
December 31, 2016 | $ | 14,744 | $ | 15,723 | $ | 78 | $ | 14,843 | $ | 802 | $ | 15,723

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of items for which it is not practicable to estimate fair value. Such disclosure may be for an individual financial instrument or a class of financial instruments. The information to be included herein might include the carrying amount, effective interest rate, and maturity of the financial instrument or class of financial instruments (as applicable), as well as the reasons why estimating fair value is not practicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13504-108611 + Details
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- Definition Tabular disclosure of the fair value measurement of financial instruments classified in shareholders' equity using significant unobservable inputs (level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of level 3 (for example, transfers due to changes in the observability of significant inputs) by class of equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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