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Insurance Contract Liabilities and Reinsurance Assets - Summary of Change in Insurance Contract Liabilities (Parenthetical) (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of changes in liabilities under insurance contracts and reinsurance contracts issued [abstract] |  |
Change in gross insurance contract liabilities | $ 4,754 | $ 20,964
Change in insurance contract liabilities | 2,907 | 20,023
Increase in insurance contract liabilities | 3,632 | 20,212
Contract liabilities in gross claims and benefits | 1,122 | $ 752
Impact of U.S. Tax Reform | $ 196 |
Corporate tax rate | 21.00% | 35.00%
Impact of U.S. Tax Reform, post-tax | $ 154 |
Impact of U.S. Tax Reform |  | $ 2,246
Impact of U.S. Tax Reform, post-tax |  | 1,774
Impact of U.S. Tax Reform, deferred tax impact | $ (320) | $ 472

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