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Employee Future Benefits - Summary of Major Categories of Plan Assets and Actual Per Cent Allocation to Each Category (Detail) - CAD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Pension defined benefit plans [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | $ 4,190,000,000 | $ 4,328,000,000
Retiree welfare plans [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | 610,000,000 | 587,000,000
U.S. plans [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities | 900,000 | 700,000
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | 252,000,000 | 235,000,000
Total | $ 2,866,000,000 | $ 2,942,000,000
Percentage of fair value measurements | 100.00% | 100.00%
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Debt securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Debt securities | $ 2,088,000,000 | $ 1,979,000,000
Percentage of fair value measurements | 73.00% | 67.00%
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Cash and cash equivalents [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Cash and cash equivalents | $ 26,000,000 | $ 33,000,000
Percentage of fair value measurements | 1.00% | 1.00%
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Equity securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities | $ 500,000,000 | $ 695,000,000
Percentage of fair value measurements | 17.00% | 24.00%
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Other investments [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Percentage of fair value measurements | 9.00% | 8.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | $ 7,000,000 | $ 7,000,000
Total | $ 610,000,000 | $ 587,000,000
Percentage of fair value measurements | 100.00% | 100.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] | Debt securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Debt securities | $ 514,000,000 | $ 502,000,000
Percentage of fair value measurements | 85.00% | 85.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] | Cash and cash equivalents [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Cash and cash equivalents | $ 51,000,000 | $ 33,000,000
Percentage of fair value measurements | 8.00% | 6.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] | Equity securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities | $ 38,000,000 | $ 45,000,000
Percentage of fair value measurements | 6.00% | 8.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] | Other investments [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Percentage of fair value measurements | 1.00% | 1.00%
Canadian plans [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities | $ 0 | $ 0
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | 3,000,000 | 4,000,000
Total | $ 1,324,000,000 | $ 1,386,000,000
Percentage of fair value measurements | 100.00% | 100.00%
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Debt securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Debt securities | $ 1,033,000,000 | $ 1,165,000,000
Percentage of fair value measurements | 79.00% | 84.00%
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Cash and cash equivalents [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Cash and cash equivalents | $ 19,000,000 | $ 5,000,000
Percentage of fair value measurements | 1.00% | 1.00%
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Equity securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities | $ 269,000,000 | $ 212,000,000
Percentage of fair value measurements | 20.00% | 15.00%
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Other investments [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Percentage of fair value measurements | 0.00% | 0.00%

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