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Post-employee benefit plans - Post-Employment Benefit Plan Assets (Details) - CAD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
Disclosure of fair value of plan assets [line items] |  |  |
Equity securities, total plan assets fair value percent | 20.00% | 22.00% | 22.00%
Debt securities, total plan assets fair value percent | 64.00% | 65.00% | 68.00%
Alternative investments, total plan asset fair value percent | 16.00% | 13.00% | 10.00%
Total plan assets fair value percent | 100.00% | 100.00% | 100.00%
Defined benefit obligation hedged | $ 5,000 |  |
DB pension |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Plan assets, at fair value | 23,071 | $ 23,945 | $ 20,563
Equity securities included in total plan assets | $ 8 | $ 13 | $ 17
Equity securities percent included in total plan assets | 0.03% | 0.05% | 0.08%
Debt securities included in total plan assets | $ 68 | $ 11 | $ 15
Debt securities percent included in total plan assets | 0.30% | 0.05% | 0.07%
Alternative investments included in total plan assets | $ 135 | $ 135 | $ 135
Alternative investments percent included in total plan assets | 0.59% | 0.56% | 0.66%
DB pension | Money market |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Debt securities | $ 327 | $ 491 | $ 387
DB pension | Private equities |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Alternative investments | 1,804 | 1,484 | 1,164
DB pension | Hedge funds |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Alternative investments | 1,014 | 965 | 726
DB pension | Real estate |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Alternative investments | 758 | 484 | 55
DB pension | Other |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Alternative investments | 93 | 111 | 111
DB pension | Canadian |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Equity securities | 844 | 1,045 | 901
DB pension | Canadian | Debt securities, excluding money market |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Debt securities | 12,457 | 13,126 | 12,469
DB pension | Foreign |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Equity securities | 3,770 | 4,349 | 3,682
DB pension | Foreign | Debt securities, excluding money market |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Debt securities | $ 2,004 | $ 1,890 | $ 1,068
Bottom of range |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Equity securities, weighted average target allocation | 20.00% |  |
Debt securities, weighted average target allocation | 60.00% |  |
Alternative investments, weighted average target allocation | 0.00% |  |
Top of range |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Equity securities, weighted average target allocation | 40.00% |  |
Debt securities, weighted average target allocation | 100.00% |  |
Alternative investments, weighted average target allocation | 40.00% |  |

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