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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
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 dollars20182017
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$ 2,683$ 356$ 2,607$ 358
Service cost 51 6 49 5
Plan participant contributions 8 5 8 4
Interest cost 95 13 99 14
Benefits paid (143) (33) (129) (27)
Actuarial (gains) losses (133) (25) 171 25
Settlements and curtailments (18) - (35) -
Foreign currency translation adjustment 107 28 (87) (23)
Balance, December 31 2,650 350 2,683 356
Change in plan assets
Balance, January 1 2,408 45 2,208 39
Employer contributions 51 31 109 27
Plan participant contributions 8 5 8 4
Benefits paid (143) (33) (129) (27)
Actual return on assets, net of expenses (105) (3) 313 5
Settlements and curtailments (18) - (34) -
Foreign currency translation adjustment 99 4 (67) (3)
Balance, December 31 2,300 49 2,408 45
Funded status, end of year $ (350)$ (301)$ (275)$ (311)
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]
millions of Canadian dollars20182017
Defined benefit pension plansNon-pension benefit plansDefined benefit pension plansNon-pension benefit plans
PBO/APBO$ 2,623$ 318$ 2,655$ 325
Fair value of plan assets 2,264 6 2,370 6
Funded status$ (359)$ (312)$ (285)$ (319)

millions of Canadian dollars20182017
Defined benefit pension plansDefined benefit pension plans
ABO$ 2,504$ 1,608
Fair value of plan assets 2,264 1,409
Funded status$ (240)$ (199)
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
As atDecember 31December 31
millions of Canadian dollars20182017
Defined benefit pension plansNon-pension benefit plansDefined benefit pension plansNon-pension benefit plans
Other current liabilities$ (12)$ (19)$ (23)$ (18)
Long-term liabilities (347) (294) (264) (295)
Other long-term assets 9 11 10 -
Amount included in deferred income tax 5 (2) 2 -
AOCI, net of tax and regulatory assets 628 60 561 74
Net amount recognized$ 283$ (244)$ 286$ (239)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Regulatory assetsActuarial (gains) lossesPast service (gains) costs
millions of Canadian dollars
Defined Benefit Pension Plans (1)
Balance, January 1, 2018$ 315$ 251$ (3)
Amortized in current period (26) (37) 1
Current year addition to AOCI or regulatory assets 73 32 -
Change in foreign exchange rate 27 - -
Balance, December 31, 2018$ 389$ 246$ (2)
Non-pension benefits plans (1)
Balance, January 1, 2018$ 78$ (4)$ -
Amortized in current period 2 1 -
Current year addition to AOCI or regulatory assets (17) (4) -
Change in foreign exchange rate 2 - -
Balance, December 31, 2018$ 65$ (7)$ -
(1) The January 1, 2018 balances include a prior period reclassification from AOCI to Regulatory assets, for changes in unrecognized pension and post-retirement benefit costs to be consistent with current year presentation. Refer to notes 10 and 14 for further details.

20182017
Defined benefit pension plansNon-pension benefit plansDefined benefit pension plansNon-pension benefit plans
Actuarial losses$ 246$ (7)$ 251$ (4)
Past service (gains) costs (2) - (3) -
Regulatory assets 389 65 315 78
Total AOCI and regulatory assets before deferred income taxes 633 58 563 74
Amount included in deferred income tax assets (5) 2 (2) -
Net amount in AOCI and regulatory assets$ 628$ 60$ 561$ 74
Schedule of Net Benefit Costs [Table Text Block]
As atYear ended December 31
millions of Canadian dollars20182017
Defined benefit pension plansNon-pension benefit plansDefined benefit pension plansNon-pension benefit plans
Service cost$ 51$ 6$ 49$ 5
Interest cost 95 13 99 14
Expected return on plan assets (138) (2) (129) (3)
Current year amortization of:
Actuarial losses 33 (1) 38 2
Past service costs (gains) (1) - - (8)
Regulatory assets (liability) 26 (2) 17 (1)
Settlement, curtailments 4 - (1) -
Total$ 70$ 14$ 73$ 9
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
Fixed income48%to53%
Equities47%to52%
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
millions of Canadian dollarsNAVLevel 1Level 2TotalPercentage
December 31, 2018
Cash and cash equivalents$-$30$-$301%
Net in-transits-(56)-(56)-2%
Equity Securities:
Canadian equity-191-1918%
US equity -330-33014%
Other equity-157-1577%
Fixed income securities:
Government--1191195%
Corporate--1081085%
Other-437-
Mutual funds-132-1326%
Other-84121%
Open-ended investments measured at NAV (1)820--82036%
Common collective trusts measured at NAV (2)450--45019%
Total $1,270$796$234$2,300100%

December 31, 2017
Cash and cash equivalents$ - $ 32$ - $ 321%
Net in-transits - (36) - (36)-1%
Equity securities:
Canadian equity - 214 - 2149%
US equity - 390 - 39016%
Other equity - 197 - 1978%
Fixed Income securities:
Government - - 72 723%
Corporate - - 56 562%
Other - 5 - 5-
Mutual funds - 246 - 24610%
Other - - 4 4-
Open-ended investments measured at NAV (1) 819 - - 81934%
Common collective trusts measured at NAV (2) 409 - - 40918%
Total $ 1,228$ 1,048$ 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
2019$ 53$ 22
Expected benefit payments
2019 149 24
2020 152 25
2021 162 25
2022 169 25
2023 175 26
2024 – 2028 988 127
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:
20182017
(weighted average assumptions)Defined benefit pension plansNon-pension benefit plansDefined benefit pension plansNon-pension benefit plans
Benefit obligation – December 31:
Discount rate4.05%4.30%3.55%3.65%
Rate of compensation increase3.30%3.67%3.12%3.28%
Health care trend - initial (next year)-6.39%-6.65%
- ultimate -4.45%-4.45%
- year ultimate reached-2035-2036
Benefit cost for year ended December 31:
Discount rate3.55%3.65%3.96%4.18%
Expected long-term return on plan assets6.38%3.73%6.29%6.08%
Rate of compensation increase3.12%3.28%2.82%2.54%
Health care trend - initial (current year)-6.65%-6.78%
- ultimate -4.45%-4.45%
- year ultimate reached-2036-2035
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 17 (15)

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 2019:
millions of Canadian dollarsDefined benefit pension plansNon-pensionbenefit plans
Actuarial gains (losses)$ (15)$ (1)
Past service gains 1 6
Regulatory assets (16) 2
Total$ (30)$ 7