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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
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 dollars20172016
Change in Projected Benefit Obligation ("PBO") and Accumulated Post-retirement Benefit Obligation ("APBO")Defined benefit pension plansNon-pension benefit plansDefined benefit pension plansNon-pension benefit plans
Balance, January 1$ 2,607$ 358$ 1,520$ 88
Addition of TECO Energy, July 1, 2016 - - 1,035 277
Service cost 49 5 35 4
Plan participant contributions 8 4 8 -
Interest cost 99 14 79 9
Plan amendments - - - 2
Benefits paid (129) (27) (94) (16)
Actuarial losses 171 25 (2) (12)
Special termination (35) - - -
Foreign currency translation adjustment (87) (23) 26 6
Balance, December 31 2,683 356 2,607 358
Change in plan assets
Balance, January 1 2,208 39 1,300 6
Addition of TECO Energy, July 1, 2016 - - 830 29
Employer contributions 109 27 49 17
Plan participant contributions 8 4 8 -
Benefits paid (129) (27) (94) (16)
Actual return on assets, net of expenses 313 5 93 2
Special termination (34) - - -
Foreign currency translation adjustment (67) (3) 22 1
Balance, December 31 2,408 45 2,208 39
Funded status, end of year $ (275)$ (311)$ (399)$ (319)
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]
millions of Canadian dollars20172016
Defined benefit pension plansNon-pension benefit plansDefined benefit pension plansNon-pension benefit plans
PBO/APBO$ 2,655$ 325$ 2,579$ 358
Fair value of plan assets 2,370 6 2,171 39
Funded status$ (285)$ (319)$ (408)$ (319)

millions of Canadian dollars20172016
Defined benefit pension plansDefined benefit pension plans
ABO$ 1,608$ 2,462
Fair value of plan assets 1,409 2,171
Funded status$ (199)$ (291)
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
As atDecember 31December 31
millions of Canadian dollars20172016
Defined benefit pension plansNon-pension benefit plansDefined benefit pension plansNon-pension benefit plans
Current liabilities$ (23)$ (18)$ (41)$ (17)
Long-term liabilities (264) (295) (367) (302)
Other asset (non-current) 10 - 9 -
Amount included in deferred tax asset 15 1 16 (1)
AOCL (AOCI) and regulatory assets after-tax adjustment 548 73 620 45
Net amount recognized at end of year$ 286$ (239)$ 237$ (275)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Regulatory assetsActuarial losses(gains)Past service(gains) costs
millions of Canadian dollars
Defined Benefit Pension Plans
Balance, January 1, 2017$ 309$ 330$ (3)
Amortized in current period (17) (38) -
Current year addition to AOCL or regulatory assets (10) (8) -
Balance, December 31, 2017$ 282$ 284$ (3)
Non-pension benefits plans
Balance, January 1, 2017$ 48$ 15$ (19)
Amortized in current period 1 (2) 8
Current year addition to AOCL (AOCI) or regulatory assets 25 (2) -
Balance, December 31, 2017$ 74$ 11$ (11)

20172016
Defined benefit pension plansNon-pension benefit plansDefined benefit pension plansNon-pension benefit plans
Actuarial losses$ 284$ 11$ 330$ 15
Past service (gains) (3) (11) (3) (19)
Regulatory assets 282 74 309 48
Total AOCL (AOCI) and regulatory assets on a pre-tax basis 563 74 636 44
Amount included in deferred tax asset (15) (1) (16) 1
Net amount in AOCL (AOCI) and regulatory assets after-tax adjustment$ 548$ 73$ 620$ 45
Schedule of Net Benefit Costs [Table Text Block]
As atYear ended December 31
millions of Canadian dollars20172016
Defined benefit pension plansNon-pension benefit plansDefined benefit pension plansNon-pension benefit plans
Service cost$ 49$ 5$ 35$ 4
Interest cost 99 14 79 9
Expected return on plan assets (129) (3) (97) (1)
Current year amortization of:
Actuarial losses 38 2 42 2
Past service costs (gains) - (8) (1) (8)
Regulatory assets (liability) 17 (1) 9 -
Settlement, curtailments (1) - - -
Total$ 73$ 9$ 67$ 6
Schedule of Allocation of Plan Assets [Table Text Block]
Canadian Pension Plans
Asset ClassTarget Range at Market
Short-term securities0%to5%
Fixed income35%to50%
Equities:
Canadian12%to22%
Non-Canadian30%to55%

Non-Canadian Pension Plans
Asset ClassTarget Range at MarketWeighted average
Short-term securities47%to52%
Equities48%to53%

As atDecember 31, 2016
millions of Canadian dollarsNAVLevel 1Level 2TotalPercentage
Cash and cash equivalents - $ 31$ - 311%
Net in-transits - (42) - (42)(2)%
Equity securities:
Canadian equity - 192 - 1929%
US equity - 303 - 30314%
Other equity - 243 - 24311%
Fixed Income securities:
Government - - 47 472%
Corporate - - 53 532%
Other - 514 191%
Open-ended investments measured at NAV (1)$ 1,132 - - 1,13251%
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.

Asset ClassTarget Range at Market
Short-term securities0%to0%
Equities:
US0%to0%
Non-US0%to0%

December 31,2017
millions of Canadian dollarsNAVLevel 1Level 2TotalPercentage
Cash and cash equivalents-$ 1$ - $ 1 2%
Life insurance policies (1)- - 39 39 87%
Other investments measured at NAV$ 5 - - 5 11%
Total $ 5$ 1$ 39$ 45 100%
(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 31,2016
millions of Canadian dollarsNAVLevel 1Level 2TotalPercentage
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
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
As atDecember 31, 2017
millions of Canadian dollarsNAVLevel 1Level 2TotalPercentage
Cash and cash equivalents-$32-$321%
Net in-transits-(36)-(36)(1)%
Equity Securities:
Canadian equity214-2149%
US equity -390-39016%
Other equity-197-1978%
Fixed income securities:
Government--$72723%
Corporate--56562%
Other-5-5-%
Other-44-%
Open-ended investments measured at NAV (1)$1,065--1,06544%
Common collective trusts measured at NAV (2)409--40918%
Total $1,474$802$132$2,408100%
(1) NAV investments are open-ended registered and non-registered mutual funds, collective investment trusts, or pooled funds. NAV’s are calculated daily and the funds honor subscription and redemption activity regularly.
(2) The common collective trusts are private funds valued at NAV. The NAVs are calculated based on bid prices of the underlying securities. Since the prices are not published to external sources, NAV is used as a practical expedient. Certain funds invest primarily in equity securities of domestic and foreign issuers while others invest in long duration U.S. investment grade fixed income assets and seeks to increase return through active management of interest rate and credit risks. The funds honor subscription and redemption activity regularly.
Schedule of Expected Benefit Payments [Table Text Block]
millions of Canadian dollarsDefined benefit pension plansNon-pension benefit plans
Expected employer contributions
2018$ 97$ 25
Expected benefit payments
2018 147 22
2019 143 23
2020 148 23
2021 157 23
2022 165 24
2023 – 2027 912 124
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:
20172016
(weighted average assumptions)Defined benefit pension plansNon-pension benefit plansDefined benefit pension plansNon-pension benefit plans
Benefit obligation – December 31:
Discount rate3.55%3.65%3.96%4.18%
Rate of compensation increase3.12%3.28%2.82%2.54%
Health care trend - initial (next year)-6.65%-6.78%
- ultimate -4.45%-4.45%
- year ultimate reached-2036-2035
Benefit cost for year ended December 31:
Discount rate3.96%4.18%3.79%3.88%
Expected long-term return on plan assets6.29%6.08%6.33%4.43%
Rate of compensation increase2.82%2.54%2.88%2.56%
Health care trend - initial (current year)-6.78%-6.76%
- ultimate -4.45%-4.45%
- year ultimate reached-2035-2020
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 dollarsIncreaseDecrease
Service cost and interest cost$ 1$ (1)
Accumulated post-retirement benefit obligation, December 31 19 (16)

millions of Canadian dollarsIncreaseDecrease
Discount rate assumption$ (9)$ 9
Asset rate assumption (6) 6
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 2018:
2018
millions of Canadian dollarsDefined benefit pension plansNon-pensionbenefit plans
Actuarial gains (losses)$ (36)$ (2)
Past service gains 1 6
Regulatory assets (21) (2)
Total$ (56)$ 2