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employee future benefits - Disaggregation of defined benefit pension (Details) - Pension plans - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | $ (913) | $ (425) |
PBSR interim estimate of solvency position | $ 375 |  |
PBSR prior year update of annual estimate of solvency position |  | 372 |
PBSR prior year interim estimate of solvency position |  | $ 568 |
PBSR composite weighted average discount rate | 2.60% | 2.90% |
Hypothetical basis points decrease in PBSR composite weighted average discount rate (as a per cent) | 0.25% | 0.25% |
Decrease in the PBSR solvency position with hypothetical decrease of 25 basis points in the composite weighted average discount rate | $ 330 | $ 295 |
Minimum |  |  |
Defined benefit pension plans - funded status overview |  |  |
PBSR interim solvency ratio | 95.00% | 98.00% |
PBSR annual solvency ratio |  | 96.00% |
PBSR interim three-year solvency ratio | 97.00% | 98.00% |
PBSR annual three-year solvency ratio |  | 97.00% |
Maximum |  |  |
Defined benefit pension plans - funded status overview |  |  |
PBSR interim solvency ratio | 109.00% | 112.00% |
PBSR annual solvency ratio |  | 109.00% |
PBSR interim three-year solvency ratio | 109.00% | 109.00% |
PBSR annual three-year solvency ratio |  | 108.00% |
Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | $ 10,521 | $ 9,684 | $ 8,723
Plan assets net of Effect of asset ceiling limit |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 9,608 | 9,259 |
Active members | Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 2,461 | 2,184 |
Deferred members | Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 561 | 513 |
Pensioners | Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 7,499 | 6,987 |
Pension plans that have plan assets in excess of defined benefit obligations accrued |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 13 | 155 |
PBSR interim estimate of solvency position | 524 |  |
PBSR prior year update of annual estimate of solvency position |  | 473 |
Pension plans that have plan assets in excess of defined benefit obligations accrued | Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 708 | 8,277 |
Pension plans that have plan assets in excess of defined benefit obligations accrued | Plan assets net of Effect of asset ceiling limit |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 721 | 8,432 |
Pension plans that have defined benefit obligations accrued in excess of plan assets |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | (926) | (580) |
PBSR interim estimate of solvency position | (149) |  |
PBSR prior year update of annual estimate of solvency position |  | (101) |
Pension plans that have defined benefit obligations accrued in excess of plan assets | Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 9,813 | 1,407 |
Pension plans that have defined benefit obligations accrued in excess of plan assets | Plan assets net of Effect of asset ceiling limit |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 8,887 | 827 |
Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | (663) | (340) |
PBSR interim estimate of solvency position | (149) |  |
PBSR prior year update of annual estimate of solvency position |  | (101) |
Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded | Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 9,550 | 1,167 |
Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded | Plan assets net of Effect of asset ceiling limit |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 8,887 | 827 |
Pension plans that have defined benefit obligations accrued in excess of plan assets - Unfunded |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | (263) | (240) |
Pension plans that have defined benefit obligations accrued in excess of plan assets - Unfunded | Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | $ 263 | $ 240 |

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