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Changes in Accounting Policies - Narrative (Details) - CAD ($) | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of voluntary change in accounting policy [line items] |  |  |
Right-of-use assets | $ 770,000,000 |  | $ 0
Lease liabilities | 902,000,000 |  | 0
Operating leases |  |  | 1,056,000,000
Financial assets | 152,785,000,000 |  | 143,061,000,000
IFRS 16 |  |  |
Disclosure of voluntary change in accounting policy [line items] |  |  |
Right-of-use assets |  | $ 744,000,000 |
Lease liabilities |  | 880,000,000 |
De-recognition of deferred balances |  | 105,000,000 |
Deferred tax impact |  | $ 9,000,000 |
Weighted average incremental borrowing rate applied to lease liabilities at date of initial application of IFRS 16 |  | 3.30% |
IFRS 16 | Restatement Adjustment |  |  |
Disclosure of voluntary change in accounting policy [line items] |  |  |
Reduction to retained earnings |  | $ 22,000,000 |
Debt securities | Credit risk |  |  |
Disclosure of voluntary change in accounting policy [line items] |  |  |
Financial assets | 81,606,000,000 |  | 74,443,000,000
Debt securities | Credit risk | Available-for-sale |  |  |
Disclosure of voluntary change in accounting policy [line items] |  |  |
Financial assets | 13,712,000,000 |  | 13,041,000,000
Mortgages and loans(1) |  |  |
Disclosure of voluntary change in accounting policy [line items] |  |  |
Financial assets | $ 48,222,000,000 |  | $ 46,822,000,000

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