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employee future benefits - Disaggregation of defined benefit pension (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | $ 8,723 | $ 9,419 |
Pension plans |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | (57) | 334 |
PBSR interim estimate of solvency position | $ 276 |  |
PBSR prior year update of annual estimate of solvency position |  | 390 |
PBSR prior year interim estimate of solvency position |  | $ 255 |
PBSR composite weighted average discount rate | 3.00% | 3.00% |
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 | $ 303 | $ 316 |
Pension plans | Minimum |  |  |
Defined benefit pension plans - funded status overview |  |  |
PBSR interim solvency ratio | 94.00% | 90.00% |
PBSR annual solvency ratio |  | 95.00% |
PBSR interim three-year solvency ratio | 95.00% | 93.00% |
PBSR annual three-year solvency ratio |  | 94.00% |
Pension plans | Maximum |  |  |
Defined benefit pension plans - funded status overview |  |  |
PBSR interim solvency ratio | 106.00% | 105.00% |
PBSR annual solvency ratio |  | 108.00% |
PBSR interim three-year solvency ratio | 106.00% | 104.00% |
PBSR annual three-year solvency ratio |  | 105.00% |
Pension plans | Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | $ 8,723 | $ 9,419 | $ 8,837
Pension plans | Plan assets net of Effect of asset ceiling limit |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | (8,780) | (9,085) |
Pension plans | Active members | Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 1,960 | 2,285 |
Pension plans | Deferred members | Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 469 | 560 |
Pension plans | Pensioners | Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 6,294 | 6,574 |
Pension plans that have plan assets in excess of defined benefit obligations accrued | Pension plans |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | (503) | (156) |
PBSR interim estimate of solvency position | 360 |  |
PBSR prior year update of annual estimate of solvency position |  | 451 |
Pension plans that have plan assets in excess of defined benefit obligations accrued | Pension plans | Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 7,479 | 8,116 |
Pension plans that have plan assets in excess of defined benefit obligations accrued | Pension plans | Plan assets net of Effect of asset ceiling limit |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | (7,982) | (8,272) |
Pension plans that have defined benefit obligations accrued in excess of plan assets | Pension plans |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 446 | 490 |
PBSR interim estimate of solvency position | (84) |  |
PBSR prior year update of annual estimate of solvency position |  | (61) |
Pension plans that have defined benefit obligations accrued in excess of plan assets | Pension plans | Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 1,244 | 1,303 |
Pension plans that have defined benefit obligations accrued in excess of plan assets | Pension plans | Plan assets net of Effect of asset ceiling limit |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | (798) | (813) |
Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded | Pension plans |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 240 | 286 |
PBSR interim estimate of solvency position | (84) |  |
PBSR prior year update of annual estimate of solvency position |  | (61) |
Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded | Pension plans | Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 1,038 | 1,099 |
Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded | Pension plans | Plan assets net of Effect of asset ceiling limit |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | (798) | (813) |
Pension plans that have defined benefit obligations accrued in excess of plan assets - Unfunded | Pension plans |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | 206 | 204 |
Pension plans that have defined benefit obligations accrued in excess of plan assets - Unfunded | Pension plans | Present value of the defined benefit obligations |  |  |
Defined benefit pension plans - funded status overview |  |  |
Net defined liability/(assets) | $ 206 | $ 204 |

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