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Pensions and Other Post Retirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2022
Pensions and Other Post Retirement Benefits |
Schedule of changes in benefit obligations and plan assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Other |
​ | ​ | ​ | ​ | ​ | ​ | Post-Retirement |
​ | ​ | Pension Benefits | ​ | Benefits |
($ millions) |  | 2022 |  | 2021 |  | 2022 |  | 2021 |
Change in benefit obligation |  |  |  |  |  |  |  |  | ​
Benefit obligation at beginning of year |  | 8 303 |  | 8 682 |  | 672 |  | 690 | ​
Current service costs |  | 263 |  | 302 |  | 19 |  | 19 | ​
Plan participants’ contributions |  | 17 |  | 17 |  | - |  | - | ​
Benefits paid |  | (367) |  | (350) |  | (28) |  | (27) | ​
Interest costs |  | 246 |  | 222 |  | 20 |  | 18 | ​
Foreign exchange |  | (2) |  | (6) |  | - |  | - | ​
Settlements |  | 10 |  | 11 |  | - |  | - | ​
Actuarial remeasurement: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Experience (gain) loss arising on plan liabilities |  | (86) |  | (1) |  | 3 |  | (1) | ​
Actuarial gain arising from changes in demographic assumptions |  | - |  | (2) |  | - |  | - | ​
Actuarial gain arising from changes in financial assumptions |  | (2 229) |  | (572) |  | (167) |  | (27) | ​
Benefit obligation at end of year |  | 6 155 |  | 8 303 |  | 519 |  | 672 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Change in plan assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets at beginning of year |  | 7 701 |  | 7 305 |  | - |  | - | ​
Employer contributions |  | 61 |  | (11) |  | - |  | - | ​
Plan participants’ contributions |  | 17 |  | 17 |  | - |  | - | ​
Benefits paid |  | (347) |  | (325) |  | - |  | - | ​
Foreign exchange |  | (4) |  | (5) |  | - |  | - | ​
Settlements |  | 10 |  | 11 |  | - |  | - | ​
Administrative costs |  | (2) |  | (2) |  | - |  | - | ​
Income on plan assets |  | 225 |  | 181 |  | - |  | - | ​
Actuarial remeasurement: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Return on plan assets greater / (less) than discount rate |  | (1 190) |  | 530 |  | - |  | - | ​
Fair value of plan assets at end of year |  | 6 471 |  | 7 701 |  | - |  | - | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Effect of the asset ceiling | ​ | 187 | ​ | - | ​ | - | ​ | - | ​
Net surplus / (unfunded obligation) at end of year |  | 129 |  | (602) |  | (519) |  | (672) | ​
​
Schedule of defined benefit plan expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Other |
​ | ​ | ​ | ​ | ​ | ​ | Post-Retirement |
​ | ​ | Pension Benefits | ​ | Benefits |
($ millions) |  | 2022 |  | 2021 |  | 2022 |  | 2021 |
Analysis of amount charged to earnings: |  |  |  |  | ​ | ​ |  |  | ​
Current service costs |  | 263 |  | 302 |  | 19 |  | 19 | ​
Interest costs |  | 21 |  | 41 |  | 20 |  | 18 | ​
Defined benefit plans expense |  | 284 |  | 343 |  | 39 |  | 37 | ​
Defined contribution plans expense |  | 95 |  | 94 |  | - |  | - | ​
Total benefit plans expense charged to earnings |  | 379 |  | 437 |  | 39 |  | 37 | ​
​ Components of defined benefit costs recognized in Other Comprehensive Income:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Other |
​ | ​ | ​ | ​ | ​ | ​ | Post-Retirement |
​ | ​ | Pension Benefits | ​ | Benefits |
($ millions) |  | 2022 |  | 2021 |  | 2022 |  | 2021 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Actuarial (gain) / loss arising from changes in experience |  | (86) |  | (1) |  | 3 |  | (1) | ​
Actuarial gain arising from changes in financial assumptions |  | (2 229) |  | (572) |  | (167) |  | (27) | ​
Actuarial gain arising from changes in demographic assumptions |  | - |  | (2) |  | - |  | - | ​
Benefit Obligation gains | ​ | (2 315) | ​ | (575) | ​ | (164) | ​ | (28) | ​
Return on plan assets (greater) / less than discount rate (excluding amounts included in net interest expense) | ​ | 1 190 | ​ | (530) | ​ | - | ​ | - | ​
Effect of the asset ceiling | ​ | 187 | ​ | - | ​ | - | ​ | - | ​
Plan assets loss / (gain) | ​ | 1 377 | ​ | (530) | ​ | - | ​ | - | ​
Actuarial gain recognized in other comprehensive income |  | (938) |  | (1 105) |  | (164) |  | (28) | ​
​
Schedule of weighted average actuarial assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Other |
​ | ​ | ​ | ​ | ​ | ​ | Post-Retirement |
​ | ​ | Pension Benefits | ​ | Benefits |
​ |  | December 31 |  | December 31 |  | December 31 |  | December 31 |
(%) | ​ | 2022 | ​ | 2021 | ​ | 2022 | ​ | 2021 |
Discount rate |  | 5.10 |  | 2.90 |  | 5.10 |  | 2.90 | ​
Rate of compensation increase |  | 3.00 |  | 3.00 |  | 3.00 |  | 3.00 | ​
​
Summary of sensitivity analysis for actuarial assumptions | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits |
($ millions) |  | Increase |  | Decrease |
1% change in discount rate | ​ | ​ | ​ | ​ | ​
Effect on the aggregate service and interest costs |  | (25) |  | 32 | ​
Effect on the benefit obligations |  | (693) |  | 871 | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Other |
​ | ​ | Post-Retirement |
​ | ​ | Benefits |
($ millions) |  | Increase |  | Decrease |
1% change in discount rate |  |  |  |  | ​
Effect on the benefit obligations |  | (53) | ​ | 64 | ​
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 | The company’s weighted average pension plan asset allocations, based on market values as at December 31, are as follows:
​ | ​ | ​ | ​ | ​ | ​
(%) |  | 2022 |  | 2021 |
Equities |  | 52 |  | 48 | ​
Fixed income |  | 27 |  | 38 | ​
Plan assets, comprised of: |  |  |  |  | ​
– Real Estate |  | 21 |  | 14 | ​
Total |  | 100 |  | 100 | ​
​

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