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PENSIONS AND OTHER POST RETIREMENT BENEFITS (Tables) | 12 Months Ended
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Dec. 31, 2021
PENSIONS AND OTHER POST RETIREMENT BENEFITS |
Schedule of defined benefit obligations and funded status | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Other |
​ | ​ | ​ | ​ | ​ | ​ | Post-Retirement |
​ | ​ | Pension Benefits | ​ | Benefits |
($ millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
Change in benefit obligation |  |  |  |  |  |  |  |  | ​
Benefit obligation at beginning of year |  | 8 682 |  | 7 708 |  | 690 |  | 631 | ​
Current service costs |  | 302 |  | 272 |  | 19 |  | 15 | ​
Plan participants’ contributions |  | 17 |  | 17 |  | - |  | - | ​
Benefits paid |  | (350) |  | (316) |  | (27) |  | (24) | ​
Interest costs |  | 222 |  | 238 |  | 18 |  | 19 | ​
Foreign exchange |  | (6) |  | 1 |  | - |  | - | ​
Settlements |  | 11 |  | 5 |  | - |  | - | ​
Actuarial remeasurement: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Experience gain arising on plan liabilities |  | (1) |  | (26) |  | (1) |  | (6) | ​
Actuarial (gain) loss arising from changes in demographic assumptions |  | (2) |  | 50 |  | - |  | 12 | ​
Actuarial (gain) loss arising from changes in financial assumptions |  | (572) |  | 733 |  | (27) |  | 43 | ​
Benefit obligation at end of year |  | 8 303 |  | 8 682 |  | 672 |  | 690 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Change in plan assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets at beginning of year |  | 7 305 |  | 6 693 |  | - |  | - | ​
Employer contributions |  | (11) |  | 132 |  | - |  | - | ​
Plan participants’ contributions |  | 17 |  | 17 |  | - |  | - | ​
Benefits paid |  | (325) |  | (290) |  | - |  | - | ​
Foreign exchange |  | (5) |  | (1) |  | - |  | - | ​
Settlements |  | 11 |  | 5 |  | - |  | - | ​
Administrative costs |  | (2) |  | (2) |  | - |  | - | ​
Income on plan assets |  | 181 |  | 203 |  | - |  | - | ​
Actuarial remeasurement: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Return on plan assets greater than discount rate |  | 530 |  | 548 |  | - |  | - | ​
Fair value of plan assets at end of year |  | 7 701 |  | 7 305 |  | - |  | - | ​
Net unfunded obligation |  | 602 |  | 1 377 |  | 672 |  | 690 | ​
Schedule of defined benefit plan expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Other |
​ | ​ | ​ | ​ | ​ | ​ | Post-Retirement |
​ | ​ | Pension Benefits | ​ | Benefits |
($ millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
Analysis of amount charged to earnings: |  |  |  |  | ​ | ​ |  |  | ​
Current service costs |  | 302 |  | 272 |  | 19 |  | 15 | ​
Interest costs |  | 41 |  | 35 |  | 18 |  | 19 | ​
Defined benefit plans expense |  | 343 |  | 307 |  | 37 |  | 34 | ​
Defined contribution plans expense |  | 94 |  | 83 |  | - |  | - | ​
Total benefit plans expense charged to earnings |  | 437 |  | 390 |  | 37 |  | 34 | ​
​ Components of defined benefit costs recognized in Other Comprehensive Income:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Other |
​ | ​ | ​ | ​ | ​ | ​ | Post-Retirement |
​ | ​ | Pension Benefits | ​ | Benefits |
($ millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
Return on plan assets (excluding amounts included in net interest expense) |  | (530) |  | (548) |  | - |  | - | ​
Actuarial (gain) arising from experience on plan liabilities |  | (1) |  | (26) |  | (1) |  | (6) | ​
Actuarial (gain) loss arising from changes in financial assumptions |  | (572) |  | 733 |  | (27) |  | 43 | ​
Actuarial (gain) loss arising from changes in demographic assumptions |  | (2) |  | 50 |  | - |  | 12 | ​
Actuarial (gain) loss recognized in other comprehensive income |  | (1 105) |  | 209 |  | (28) |  | 49 | ​
Schedule of weighted average actuarial assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Other |
​ | ​ | ​ | ​ | ​ | ​ | Post-Retirement |
​ | ​ | Pension Benefits | ​ | Benefits |
​ |  | December 31 |  | December 31 |  | December 31 |  | December 31 |
(%) | ​ | 2021 | ​ | 2020 | ​ | 2021 | ​ | 2020 |
Discount rate |  | 2.90 |  | 2.50 |  | 2.90 |  | 2.50 | ​
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 |  | (24) |  | 31 | ​
Effect on the benefit obligations |  | (1 155) |  | 1 515 | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Other |
​ | ​ | Post-Retirement |
​ | ​ | Benefits |
($ millions) |  | Increase |  | Decrease |
1% change in discount rate |  |  |  |  | ​
Effect on the benefit obligations |  | (80) | ​ | 99 | ​
1% change in health care cost |  |  |  |  | ​
Effect on the aggregate service and interest costs |  | 1 | ​ | (1) | ​
Effect on the benefit obligations |  | 36 | ​ | (31) | ​
​
Schedule of weighted average pension plan asset allocations based on market value | The company’s weighted average pension plan asset allocations, based on market values as at December 31, are as follows:
​ | ​ | ​ | ​ | ​ | ​
(%) |  | 2021 |  | 2020 |
Equities |  | 48 |  | 50 | ​
Fixed income |  | 38 |  | 38 | ​
Plan assets, comprised of: |  |  |  |  | ​
– Real Estate |  | 14 |  | 12 | ​
Total |  | 100 |  | 100 | ​
​

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