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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Employee Benefit Plans [Abstract] |
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] |
For the | Year ended December 31
millions of Canadian dollars | 2016 | 2015
Change in Projected Benefit Obligation ("PBO") and Accumulated Post-retirement Benefit Obligation ("APBO") | Defined benefit pension plans | Non-pension benefit plans | Defined benefit pension plans | Non-pension benefit plans
Balance, January 1 | $ | 1,520 | $ | 88 | $ | 1,470 | $ | 102
Addition of TECO Energy, July 1, 2016 |  | 1,035 |  | 277 |  | - |  | -
Service cost |  | 35 |  | 4 |  | 22 |  | 3
Plan participant contributions |  | 8 |  | - |  | 8 |  | -
Interest cost |  | 79 |  | 9 |  | 59 |  | 4
Plan amendments |  | - |  | 2 |  | - |  | (27)
Benefits paid |  | (94) |  | (16) |  | (61) |  | (6)
Actuarial losses |  | (2) |  | (12) |  | (15) |  | 1
Foreign currency translation adjustment |  | 26 |  | 6 |  | 37 |  | 11
Balance, December 31 |  | 2,607 |  | 358 |  | 1,520 |  | 88
Change in plan assets |  |  |  |  |  |  |  |
Balance, January 1 |  | 1,300 |  | 6 |  | 1,205 |  | 5
Addition of TECO Energy, July 1, 2016 |  | 830 |  | 29 |  | - |  | -
Employer contributions |  | 49 |  | 17 |  | 23 |  | 6
Plan participant contributions |  | 8 |  | - |  | 8 |  | -
Benefits paid |  | (94) |  | (16) |  | (61) |  | (6)
Actual return on assets, net of expenses |  | 93 |  | 2 |  | 96 |  | -
Foreign currency translation adjustment |  | 22 |  | 1 |  | 29 |  | 1
Balance, December 31 |  | 2,208 |  | 39 |  | 1,300 |  | 6
Funded status, end of year | $ | (399) | $ | (319) | $ | (220) | $ | (82)
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] |
millions of Canadian dollars |  |  | 2016 | 2015
| Defined benefit pension plans | Non-pension benefit plans | Defined benefit pension plans | Non-pension benefit plans
PBO/APBO | $ | 2,579 | $ | 358 | $ | 1,489 | $ | 87
Fair value of plan assets |  | 2,171 |  | 39 |  | 1,261 |  | 5
Funded status | $ | (408) | $ | (319) | $ | (228) | $ | (82)
millions of Canadian dollars | 2016 | 2015
| Defined benefit pension plans | Defined benefit pension plans
ABO | $ | 2,462 | $ | 1,424
Fair value of plan assets |  | 2,171 |  | 1,261
Funded status | $ | (291) | $ | (163)
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] |
As at |  |  |  |  |  | December 31
millions of Canadian dollars | 2016 | 2015
| Defined benefit pension plans | Non-pension benefit plans | Defined benefit pension plans | Non-pension benefit plans
Current liabilities | $ | (41) | $ | (17) | $ | (4) | $ | (3)
Long-term liabilities |  | (367) |  | (302) |  | (224) |  | (79)
Other asset (non-current) |  | 9 |  | - |  | 9 |  | -
Amount included in deferred tax asset |  | 16 |  | (1) |  | 19 |  | (3)
AOCL (AOCI) and regulatory assets after-tax adjustment |  | 620 |  | 45 |  | 330 |  | (9)
Net amount recognized at end of year | $ | 237 | $ | (275) | $ | 130 | $ | (94)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
| Regulatory assets | Actuarial losses(gains) | Past service(gains) costs
millions of Canadian dollars
Defined Benefit Pension Plans |  |  |  |  |  |
Balance, January 1, 2016 | $ | - | $ | 353 | $ | (4)
Amortized in current period |  | (9) |  | (42) |  | 1
Current year addition to AOCL or regulatory assets |  | 318 |  | 19 |  | -
Balance, December 31, 2016 | $ | 309 | $ | 330 | $ | (3)
Non-pension benefits plans |  |  |  |  |  |
Balance, January 1, 2016 | $ | - | $ | 15 | $ | (27)
Amortized in current period |  | - |  | (2) |  | 8
Current year addition to AOCL (AOCI) or regulatory assets |  | 48 |  | 2 |  | -
Balance, December 31, 2016 | $ | 48 | $ | 15 | $ | (19)
| 2016 | 2015
| Defined benefit pension plans | Non-pension benefit plans | Defined benefit pension plans | Non-pension benefit plans
Actuarial losses | $ | 330 | $ | 15 | $ | 353 | $ | 15
Past service (gains) |  | (3) |  | (19) |  | (4) |  | (27)
Regulatory assets |  | 309 |  | 48 |  | - |  | -
Total AOCL (AOCI) and regulatory assets on a pre-tax basis |  | 636 |  | 44 |  | 349 |  | (12)
Amount included in deferred tax asset |  | (16) |  | 1 |  | (19) |  | 3
Net amount in AOCL (AOCI) and regulatory assets after-tax adjustment | $ | 620 | $ | 45 | $ | 330 | $ | (9)
Schedule of Net Benefit Costs [Table Text Block] |
As at |  |  |  |  |  | Year ended December 31
millions of Canadian dollars | 2016 | 2015
| Defined benefit pension plans | Non-pension benefit plans | Defined benefit pension plans | Non-pension benefit plans
Service cost | $ | 35 | $ | 4 | $ | 22 | $ | 3
Interest cost |  | 79 |  | 9 |  | 59 |  | 3
Expected return on plan assets |  | (97) |  | (1) |  | (65) |  | -
Current year amortization of: |  |  |  |  |  |  |  |
Actuarial losses |  | 42 |  | 2 |  | 48 |  | 1
Past service costs (gains) |  | (1) |  | (8) |  | (1) |  | (6)
Regulatory assets (liability) |  | 9 |  | - |  | - |  | -
Total | $ | 67 | $ | 6 | $ | 63 | $ | 1
Schedule of Allocation of Plan Assets [Table Text Block] |
Canadian Pension Plans |  |  |  |
Asset Class | Target Range at Market
Short-term securities |  | 0% | to | 5%
Fixed income |  | 35% | to | 50%
Equities: |  |  |  |
Canadian |  | 12% | to | 22%
Non-Canadian |  | 36% | to | 50%
Non-Canadian Pension Plans |  |  |  |
Asset Class | Target Range at Market Weighted average
Short-term securities |  | 0% | to | 2%
Fixed income |  | 40% | to | 48%
Equities |  | 50% | to | 61%
As at |  |  |  | December 31, 2015
millions of Canadian dollars |  | NAV | Level 1 | Total | Percentage
Cash and cash equivalents |  | - | $ | 12 | $ | 12 | 1 | %
Equity securities: |  |  |  |  |  |  |  |
Canadian equity |  | - |  | 190 |  | 190 | - | %
US equity |  | - |  | 240 |  | 240 | 18 | %
Other equity |  | - |  | 240 |  | 240 | 18 | %
Other investments measured at NAV | $ | 619 |  | - |  | 619 | 48 | %
Total | $ | 619 | $ | 682 | $ | 1,301 | 100 | %
Asset Class | Target Range at Market
Short-term securities |  | 10% | to | 50%
Fixed income |  | 0% | to | 40%
Equities: |  |  |  |
US |  | 30% | to | 60%
Non-US |  | 0% | to | 60%
|  |  |  | December 31,2016
millions of Canadian dollars | NAV | Level 1 | Level 2 | Total | Percentage
Cash and cash equivalents |  | - | $ | 1 | $ | - | $ | 1 | 3 | %
Life insurance policies (1) |  | - |  | - |  | 33 |  | 33 | 85 | %
Other investments measured at NAV | $ | 5 |  | - |  | - |  | 5 | 12 | %
Total | $ | 5 | $ | 1 | $ | 33 | $ | 39 | 100 | %
(1) For valuation purposes, the life insurance policies held for the NMGC retiree medical plan are valued at the cash surrender value and are considered Level 2 assets
|  |  |  | December 31, 2015
millions of Canadian dollars | NAV | Level 1 | Level 2 | Total | Percentage
Cash and cash equivalents |  | - | $ | 1 | $ | - | $ | 1 | 20 | %
Other investments measured at NAV | $ | 4 |  | - |  | - |  | 4 | 80 | %
Total | $ | 4 | $ | 1 | $ | - | $ | 5 | 100 | %
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] |
As at |  |  |  |  | December 31, 2016
millions of Canadian dollars | NAV | Level 1 | Level 2 | Total | Percentage
Cash and cash equivalents |  | - | $ | 31 |  | - | $ | 31 | 1 | %
Net in-transits |  | - |  | (42) |  | - |  | (42) | (2) | %
Equity Securities: |  |  |  |  |  |  |  |  |  |
Canadian equity |  |  |  | 192 |  |  |  | 192 | 9 | %
US equity |  | - |  | 303 |  | - |  | 303 | 14 | %
Other equity |  | - |  | 243 |  |  |  | 243 | 11 | %
Fixed income securities: |  |  |  |  |  |  |  |  |  |
Government |  | - |  | - | $ | 47 |  | 47 | 2 | %
Corporate |  | - |  | - |  | 53 |  | 53 | 2 | %
Other |  | - |  | 5 |  | 14 |  | 19 | 1 | %
Open-ended investments measured at NAV (1) | $ | 1,132 |  | - |  | - |  | 1,132 | 51 | %
Common collective trusts measured at NAV (2) |  | 230 |  | - |  | - |  | 230 | 11 | %
Total | $ | 1,362 | $ | 732 | $ | 114 | $ | 2,208 | 100 | %
(1) NAV investments are open-ended registered and non-registered mutual funds, collective investment trusts, or pooled funds. NAV’s are calculated daily and the funds honor subscription and redemption activity regularly.
(2) The common collective trusts are private funds valued at NAV. The NAVs are calculated based on bid prices of the underlying securities. Since the prices are not published to external sources, NAV is used as a practical expedient. Certain funds invest primarily in equity securities of domestic and foreign issuers while others invest in long duration U.S. investment grade fixed income assets and seeks to increase return through active management of interest rate and credit risks. The funds honor subscription and redemption activity regularly.
Schedule of Expected Benefit Payments [Table Text Block] |
millions of Canadian dollars | Defined benefit pension plans | Non-pension benefit plans
Expected employer contributions |  |  |  |
2017 | $ | 117 | $ | 25
Expected benefit payments |  |  |  |
2017 |  | 172 |  | 22
2018 |  | 140 |  | 23
2019 |  | 150 |  | 23
2020 |  | 156 |  | 24
2021 |  | 165 |  | 25
2022 – 2026 |  | 912 |  | 130
Schedule of Assumptions Used [Table Text Block] |
Assumptions |  |  |  |  |  |  |  |
The following table shows the assumptions that have been used in accounting for defined benefit pension and other post-retirement benefit plans: |
| 2016 | 2015
(weighted average assumptions) | Defined benefit pension plans | Non-pension benefit plans | Defined benefit pension plans | Non-pension benefit plans
Benefit obligation – December 31: |  |  |  |  |  |  |  |
Discount rate | 3.96 | % | 4.18 | % | 4.02 | % | 4.04 | %
Rate of compensation increase | 2.82 | % | 2.54 | % | 3.07 | % | 3.50 | %
Health care trend - initial (next year) | - |  | 6.78 | % | - |  | 5.50 | %
- ultimate | - |  | 4.45 | % | - |  | 4.20 | %
- year ultimate reached | - |  | 2020 |  | - |  | 2020 |
Benefit cost for year ended December 31: |  |  |  |  |  |  |  |
Discount rate | 3.79 | % | 3.88 | % | 3.99 | % | 3.98 | %
Expected long-term return on plan assets | 6.33 | % | 4.43 |  | 5.91 | % | - |
Rate of compensation increase | 2.88 | % | 2.56 | % | 3.07 | % | 3.50 | %
Health care trend - initial (current year) | - |  | 6.76 | % | - |  | 5.90 | %
- ultimate | - |  | 4.45 | % | - |  | 4.30 | %
- year ultimate reached | - |  | 2020 |  | - |  | 2020 |
Figures shown are weighted averages. Actual assumptions used differ by plan.
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] |
millions of Canadian dollars | Increase | Decrease
Service cost and interest cost | $ | 1 | $ | (1)
Accumulated post-retirement benefit obligation, December 31 |  | 20 |  | (17)
millions of Canadian dollars | Increase | Decrease
Discount rate assumption | $ | (7) | $ | 7
Asset rate assumption |  | (4) |  | 4
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] |
Amounts to be Amortized in the Next Fiscal Year
The following table shows the amounts from the AOCL and regulatory assets, which are expected to be recognized as part of the net periodic benefit cost in fiscal 2017:
|  | 2017
millions of Canadian dollars | Defined benefit pension plans | Non-pension benefit plans
Actuarial gains (losses) | $ | (53) | $ | (1)
Past service gains |  | 1 |  | 8
Regulatory assets |  | (16) |  | 3
Total | $ | (68) | $ | 10

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