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Pension and other PostRetirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2018
PENSIONS AND OTHER POST RETIREMENT BENEFITS |
Schedule of defined benefit obligations and funded status |
|  | Pension Benefits |  | Other Post-Retirement Benefits |  |
($ millions) |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  |
Change in benefit obligation |  |  |  |  |  |  |  |  |  |
| Benefit obligation at beginning of year |  | 6 717 |  | 6 280 |  | 597 |  | 587 |  |
| Obligations acquired through acquisition (note 31) |  | 185 |  | — |  | 8 |  | — |  |
| Current service costs |  | 235 |  | 193 |  | 13 |  | 14 |  |
| Plan participants' contributions |  | 15 |  | 14 |  | — |  | — |  |
| Benefits paid |  | (296 | ) | (294 | ) | (23 | ) | (21 | ) |
| Interest costs |  | 236 |  | 236 |  | 21 |  | 22 |  |
| Disposal (note 33) |  | — |  | (69 | ) | — |  | (9 | ) |
| Foreign exchange |  | 14 |  | (2 | ) | 1 |  | (1 | ) |
| Settlements |  | 5 |  | 7 |  | — |  | — |  |
| Actuarial remeasurement: |  |  |  |  |  |  |  |  |  |
|  | Experience (gain) loss arising on plan liabilities |  | (26 | ) | 2 |  | (18 | ) | (12 | ) |
|  | Actuarial gain arising from changes in demographic assumptions |  | (1 | ) | (4 | ) | — |  | (9 | ) |
|  | Actuarial (gain) loss arising from changes in financial assumptions |  | (354 | ) | 354 |  | (42 | ) | 26 |  |
Benefit obligation at end of year |  | 6 730 |  | 6 717 |  | 557 |  | 597 |  |
Change in plan assets |  |  |  |  |  |  |  |  |  |
| Fair value of plan assets at beginning of year |  | 5 799 |  | 5 356 |  | — |  | — |  |
| Assets acquired through acquisition (note 31) |  | 153 |  | — |  | — |  | — |  |
| Employer contributions |  | 182 |  | 160 |  | — |  | — |  |
| Plan participants' contributions |  | 15 |  | 14 |  | — |  | — |  |
| Benefits paid |  | (273 | ) | (269 | ) | — |  | — |  |
| Disposal (note 33) |  | — |  | (71 | ) | — |  | — |  |
| Foreign exchange |  | 14 |  | (3 | ) | — |  | — |  |
| Settlements |  | 5 |  | 7 |  | — |  | — |  |
| Administrative costs |  | (2 | ) | (2 | ) | — |  | — |  |
| Income on plan assets |  | 201 |  | 200 |  | — |  | — |  |
| Actuarial remeasurement: |  |  |  |  |  |  |  |  |  |
|  | Return on plan assets (less than) greater than discount rate |  | (299 | ) | 407 |  | — |  | — |  |
Fair value of plan assets at end of year |  | 5 795 |  | 5 799 |  | — |  | — |  |
Net unfunded obligation |  | 935 |  | 918 |  | 557 |  | 597 |  |
Schedule of defined benefit plan expenses |
|  | Pension Benefits |  | Other Post-Retirement Benefits |
($ millions) |  | 2018 |  | 2017 |  | 2018 |  | 2017 |
Analysis of amount charged to earnings: |  |  |  |  |  |  |  |  |
| Current service costs |  | 235 |  | 193 |  | 13 |  | 14 |
| Interest costs |  | 35 |  | 36 |  | 21 |  | 22 |
Defined benefit plans expense |  | 270 |  | 229 |  | 34 |  | 36 |
Defined contribution plans expense |  | 77 |  | 74 |  | — |  | — |
Total benefit plans expense charged to earnings |  | 347 |  | 303 |  | 34 |  | 36 |
Components of defined benefit costs recognized in Other Comprehensive Income:
|  | Pension Benefits |  | Other Post-Retirement Benefits |  |
($ millions) |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  |
Return on plan assets (excluding amounts included in net interest expense) |  | 299 |  | (407 | ) | — |  | — |  |
Experience (gain) loss arising on plan liabilities |  | (26 | ) | 2 |  | (18 | ) | (12 | ) |
Actuarial (gain) loss arising from changes in financial assumptions |  | (354 | ) | 354 |  | (42 | ) | 26 |  |
Actuarial gain arising from changes in demographic assumptions |  | (1 | ) | (4 | ) | — |  | (9 | ) |
Actuarial (gain) loss recognized in other comprehensive income |  | (82 | ) | (55 | ) | (60 | ) | 5 |  |
Schedule of weighted average actuarial assumptions |
|  | Pension Benefits |  | Other Post-Retirement Benefits |
(%) |  | December 31 2018 |  | December 31 2017 |  | December 31 2018 |  | December 31 2017 |
Discount rate |  | 3.80 |  | 3.40 |  | 3.90 |  | 3.40 |
Rate of compensation increase |  | 3.00 |  | 3.00 |  | 3.00 |  | 3.00 |
Schedule of changes in assumed assumptions |
|  | Pension Benefits |
($ millions) |  | Increase |  | Decrease |
1% change in discount rate |  |  |  |  |
| Effect on the aggregate service and interest costs |  | (23 | ) | 30 |
| Effect on the benefit obligations |  | (874 | ) | 1 127 |
|  | Other Post-Retirement Benefits |  |
($ millions) |  | Increase |  | Decrease |  |
1% change in discount rate |  |  |  |  |  |
| Effect on the benefit obligations |  | (65 | ) | 81 |  |
1% change in health care cost |  |  |  |  |  |
| Effect on the aggregate service and interest costs |  | 1 |  | (1 | ) |
| Effect on the benefit obligations |  | 27 |  | (23 | ) |
Schedule of weighted average pension plan asset allocations based on market value |
(%) |  | 2018 |  | 2017 |
Equities, comprised of: |  |  |  |  |
| – Canada |  | 13 |  | 18 |
| – United States |  | 17 |  | 19 |
| – Foreign |  | 18 |  | 19 |
|  | 48 |  | 56 |
Fixed income, comprised of: |  |  |  |  |
| – Canada |  | 43 |  | 39 |
Real estate, comprised of: |  |  |  |  |
| – Canada |  | 9 |  | 5 |
Total |  | 100 |  | 100 |

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