XML 94 R66.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Employee Future Benefits (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Employee Benefits [Abstract] |
Costs Recognized | The costs recognized in net earnings during the year on the defined benefit, defined contribution, and other post-employment benefits plans are as follows:
Year ended Dec. 31, 2017 | Registered |  | Supplemental |  | Other |  | Total |
Current service cost | 7 |  | 2 |  | 1 |  | 10 |
Administration expenses | 2 |  | — |  | — |  | 2 |
Interest cost on defined benefit obligation | 20 |  | 3 |  | 1 |  | 24 |
Interest on plan assets | (15 | ) | — |  | — |  | (15 | )
Defined benefit expense | 14 |  | 5 |  | 2 |  | 21 |
Defined contribution expense | 11 |  | — |  | — |  | 11 |
Net expense | 25 |  | 5 |  | 2 |  | 32 |
Year ended Dec. 31, 2016 | Registered |  | Supplemental |  | Other |  | Total |
Current service cost | 7 |  | 2 |  | 2 |  | 11 |
Administration expenses | 2 |  | — |  | — |  | 2 |
Interest cost on defined benefit obligation | 21 |  | 3 |  | 1 |  | 25 |
Interest on plan assets | (16 | ) | — |  | — |  | (16 | )
Defined benefit expense | 14 |  | 5 |  | 3 |  | 22 |
Defined contribution expense | 15 |  | — |  | — |  | 15 |
Net expense | 29 |  | 5 |  | 3 |  | 37 |
Year ended Dec. 31, 2015 | Registered |  | Supplemental |  | Other |  | Total |
Current service cost | 7 |  | 2 |  | 2 |  | 11 |
Administration expenses | 2 |  | — |  | — |  | 2 |
Interest cost on defined benefit obligation | 21 |  | 3 |  | 1 |  | 25 |
Interest on plan assets | (16 | ) | — |  | — |  | (16 | )
Curtailment and amendment gain(1) | — |  | (5 | ) | (3 | ) | (8 | )
Defined benefit expense | 14 |  | — |  | — |  | 14 |
Defined contribution expense | 21 |  | — |  | — |  | 21 |
Net expense | 35 |  | — |  | — |  | 35 |
(1) Relates to the reduction in the number of employees associated with the restructuring initiative described in Note 4(S). The expected employer contributions for 2018 for the defined benefit pension and other post-employment benefit plans are as follows:
| Registered |  | Supplemental |  | Other |  | Total |
Expected employer contributions | 4 |  | 6 |  | 2 |  | 12 |
Defined Benefit Obligation | The present value of the obligation for the defined benefit pension and other post-employment benefit plans is as follows:
| Registered |  | Supplemental |  | Other |  | Total |
Present value of defined benefit obligation as at Dec. 31, 2015 | 566 |  | 80 |  | 32 |  | 678 |
Current service cost | 7 |  | 2 |  | 2 |  | 11 |
Interest cost | 21 |  | 3 |  | 1 |  | 25 |
Benefits paid | (40 | ) | (5 | ) | (1 | ) | (46 | )
Actuarial gain arising from demographic assumptions | (1 | ) | — |  | (4 | ) | (5 | )
Actuarial loss arising from financial assumptions | 2 |  | — |  | — |  | 2 |
Actuarial gain (loss) arising from experience adjustments | — |  | 2 |  | (2 | ) | — |
Effect of translation on US plans | (1 | ) | — |  | (1 | ) | (2 | )
Present value of defined benefit obligation as at Dec. 31, 2016 | 554 |  | 82 |  | 27 |  | 663 |
Current service cost | 7 |  | 2 |  | 1 |  | 10 |
Interest cost | 20 |  | 3 |  | 1 |  | 24 |
Benefits paid | (51 | ) | (4 | ) | — |  | (55 | )
Actuarial loss arising from demographic assumptions | 4 |  | 1 |  | — |  | 5 |
Actuarial loss arising from financial assumptions | 26 |  | 3 |  | — |  | 29 |
Actuarial (gain) loss arising from experience adjustments | 3 |  | — |  | (1 | ) | 2 |
Effect of translation on US plans | (2 | ) | — |  | (1 | ) | (3 | )
Present value of defined benefit obligations as at Dec. 31, 2017 | 561 |  | 87 |  | 27 |  | 675 |
The status of the defined benefit pension and other post-employment benefit plans is as follows:
As at Dec. 31, 2017 | Registered |  | Supplemental |  | Other |  | Total |
Fair value of plan assets | 416 |  | 12 |  | — |  | 428 |
Present value of defined benefit obligation | (561 | ) | (87 | ) | (27 | ) | (675 | )
Funded status - plan deficit | (145 | ) | (75 | ) | (27 | ) | (247 | )
Amount recognized in the consolidated financial statements: |  |  |  |  |  |  |  |
Accrued current liabilities | (4 | ) | (6 | ) | (2 | ) | (12 | )
Other long-term liabilities | (141 | ) | (69 | ) | (25 | ) | (235 | )
Total amount recognized | (145 | ) | (75 | ) | (27 | ) | (247 | )
As at Dec. 31, 2016 | Registered |  | Supplemental |  | Other |  | Total |
Fair value of plan assets | 423 |  | 10 |  | — |  | 433 |
Present value of defined benefit obligation | (554 | ) | (82 | ) | (27 | ) | (663 | )
Funded status - plan deficit | (131 | ) | (72 | ) | (27 | ) | (230 | )
Amount recognized in the consolidated financial statements: |  |  |  |  |  |  |  |
Accrued current liabilities | (15 | ) | (6 | ) | (1 | ) | (22 | )
Other long-term liabilities | (116 | ) | (66 | ) | (26 | ) | (208 | )
Total amount recognized | (131 | ) | (72 | ) | (27 | ) | (230 | )
Plan Assets | The fair value of the plan assets of the defined benefit pension and other post-employment benefit plans is as follows:
| Registered |  | Supplemental |  | Other |  | Total |
As at Dec. 31, 2015 | 429 |  | 9 |  | — |  | 438 |
Interest on plan assets | 16 |  | — |  | — |  | 16 |
Net return on plan assets | 10 |  | — |  | — |  | 10 |
Contributions | 11 |  | 6 |  | 1 |  | 18 |
Benefits paid | (40 | ) | (5 | ) | (1 | ) | (46 | )
Administration expenses | (2 | ) | — |  | — |  | (2 | )
Effect of translation on US plans | (1 | ) | — |  | — |  | (1 | )
As at Dec. 31, 2016 | 423 |  | 10 |  | — |  | 433 |
Interest on plan assets | 15 |  | — |  | — |  | 15 |
Net return on plan assets | 26 |  | — |  | — |  | 26 |
Contributions | 6 |  | 6 |  | — |  | 12 |
Benefits paid | (51 | ) | (4 | ) | — |  | (55 | )
Administration expenses | (2 | ) | — |  | — |  | (2 | )
Effect of translation on US plans | (1 | ) | — |  | — |  | (1 | )
As at Dec. 31, 2017 | 416 |  | 12 |  | — |  | 428 |
The fair value of the Corporation’s defined benefit plan assets by major category is as follows:
Year ended Dec. 31, 2017 | Level I |  | Level II |  | Level III |  | Total |
Equity securities |  |  |  |  |  |  |  |
Canadian | — |  | 76 |  | — |  | 76 |
US | — |  | 31 |  | — |  | 31 |
International | — |  | 118 |  | — |  | 118 |
Private | — |  | — |  | 1 |  | 1 |
Bonds |  |  |  |  |  |  |  |
AAA | — |  | 43 |  | — |  | 43 |
AA | — |  | 71 |  | — |  | 71 |
A | — |  | 44 |  | — |  | 44 |
BBB | 1 |  | 25 |  | — |  | 26 |
Below BBB | — |  | 5 |  | — |  | 5 |
Money market and cash and cash equivalents | (1 | ) | 14 |  | — |  | 13 |
Total | — |  | 427 |  | 1 |  | 428 |
Year ended Dec. 31, 2016 | Level I |  | Level II |  | Level III |  | Total |
Equity securities |  |  |  |  |  |  |  |
Canadian | — |  | 76 |  | — |  | 76 |
US | — |  | 30 |  | — |  | 30 |
International | — |  | 120 |  | — |  | 120 |
Private | — |  | — |  | 2 |  | 2 |
Bonds |  |  |  |  |  |  |  |
AAA | — |  | 47 |  | — |  | 47 |
AA | — |  | 58 |  | — |  | 58 |
A | — |  | 55 |  | — |  | 55 |
BBB | 1 |  | 22 |  | — |  | 23 |
Below BBB | — |  | 5 |  | — |  | 5 |
Money market and cash and cash equivalents | 3 |  | 14 |  | — |  | 17 |
Total | 4 |  | 427 |  | 2 |  | 433 |
Assumptions | Assumptions The significant actuarial assumptions used in measuring the Corporation’s defined benefit obligation for the defined benefit pension and other post-employment benefit plans are as follows:
| As at Dec. 31, 2017 |  | As at Dec. 31, 2016
(per cent) | Registered |  | Supplemental |  | Other |  |  | Registered |  | Supplemental |  | Other |
Accrued benefit obligation |  |  |  |  |  |  |  |
Discount rate | 3.3 |  | 3.3 |  | 3.4 |  |  | 3.7 |  | 3.6 |  | 3.7 |
Rate of compensation increase | 2.9 |  | 3.0 |  | — |  |  | 2.9 |  | 3.0 |  | — |
Assumed health care cost trend rate |  |  |  |  |  |  |  |  |  |  |  |  |
Health care cost escalation | — |  | — |  | 7.8(1) |  |  | — |  | — |  | 7.9(3) |
Dental care cost escalation | — |  | — |  | 4.0 |  |  | — |  | — |  | 4.0 |
Benefit cost for the year |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate | 3.7 |  | 3.6 |  | 3.7 |  |  | 3.8 |  | 3.8 |  | 3.8 |
Rate of compensation increase | 2.6 |  | 3.0 |  | — |  |  | 3.0 |  | 3.0 |  | — |
Assumed health care cost trend rate |  |  |  |  |  |  |  |  |  |  |  |  |
Health care cost escalation | — |  | — |  | 7.9(2) |  |  | — |  | — |  | 7.8(4) |
Dental care cost escalation | — |  | — |  | 4.0 |  |  | — |  | — |  | 4.0 |
Provincial health care premium escalation | — |  | — |  | — |  |  | — |  | — |  | 5.0 |
(1) Post- and Pre 65 rates: decreasing gradually to 4.5% by 2027 and remaining at that level thereafter for the U.S. and decreasing gradually by 0.3% per year to 4.5% in 2027 for Canada. (2) Post- and Pre 65 rates: decreasing gradually to 4.5% by 2026 and remaining at that level thereafter for the U.S. and decreasing gradually by 0.30% per year to 5% in 2024 for Canada. (3) Post- and Pre 65 rates: decreasing gradually to 4.5% by 2026 and remaining at that level thereafter for the U.S. and decreasing gradually by 0.30% per year to 5% in 2024 for Canada. (4) Post- and Pre 65 rates: decreasing gradually to 5% by 2024 and remaining at that level thereafter for the U.S. and decreasing gradually by 0.35% per year to 5% in 2024 for Canada.
Schedule of Estimated Increase In The Net Defined Benefit Obligation Assuming Certain Changes In Key Assumptions | The following table outlines the estimated increase in the net defined benefit obligation assuming certain changes in key assumptions:
| Canadian plans |  | US plans
Year ended Dec. 31, 2017 | Registered |  | Supplemental |  | Other |  |  | Pension |  | Other |
1% decrease in the discount rate | 79 |  | 12 |  | 3 |  |  | 3 |  | 1 |
1% increase in the salary scale | 10 |  | 1 |  | — |  |  | — |  | — |
1% increase in the health care cost trend rate | — |  | — |  | 2 |  |  | — |  | — |
10% improvement in mortality rates | 20 |  | 2 |  | — |  |  | 1 |  | — |

X
- Definition The disclosure of defined benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 138 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_138&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DisclosureOfDefinedBenefitPlansExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The disclosure of the fair value of defined benefit plan assets. [Refer: Plan assets [member]; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 142 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_142&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DisclosureOfFairValueOfPlanAssetsExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The disclosure of a net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure Of Defined Benefit Plan Expense Recognized In Profit Or Loss Explanatory [Table Text Block] + References No definition available. + Details
Name: | tac_DisclosureOfDefinedBenefitPlanExpenseRecognizedInProfitOrLossExplanatoryTableTextBlock
Namespace Prefix: | tac_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Employee Benefits [Abstract] + References No definition available. + Details
Name: | tac_EmployeeBenefitsAbstract
Namespace Prefix: | tac_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated Increase In The Net Defined Benefit Obligation Assuming Certain Changes In Key Assumptions [Table Text Block] + References No definition available. + Details
Name: | tac_EstimatedIncreaseInTheNetDefinedBenefitObligationAssumingCertainChangesInKeyAssumptionsTableTextBlock
Namespace Prefix: | tac_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration