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Share Capital and Earnings Per share - Additional Information (Detail) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 07, 2019 | Nov. 12, 2018 | Dec. 31, 2018
Major ordinary share transactions [Member] |  |  |
Disclosure of Dividends [line items] |  |  |
Stock repurchased for cancellation, share |  |  | 23
Stock repurchased for cancellation, value |  |  | $ 478
Major ordinary share transactions [Member] | Shareholders' Retained Earnings [Member] |  |  |
Disclosure of Dividends [line items] |  |  |
Stock repurchased for cancellation, value |  |  | $ 209
Major ordinary share transactions [Member] | Dividend Reinvestment Plan [member] |  |  |
Disclosure of Dividends [line items] |  |  |
Percentage of share purchase discount for payment of dividend |  |  | 2.00%
Common shares [Member] |  |  |
Disclosure of Dividends [line items] |  |  |
Stock repurchased for cancellation, share |  |  | (23)
Stock repurchased for cancellation, value |  |  | $ 269
Common shares [Member] | Major ordinary share transactions [Member] |  |  |
Disclosure of Dividends [line items] |  |  |
Stock approved to be repurchased for cancellation, share |  | 40 |
Stock repurchased for cancellation, value |  |  | $ 269
Dividend declared but not paid | $ 0.25 |  |

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