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Risk Categories - Financial Liabilities and Contractual Obligations (Details) - CAD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | $ 330,980,000,000 | $ 313,219,000,000
Contractual loans, equities and mortgages | 3,583,000,000 | 3,800,000,000
Operating leases |  | 1,056,000,000
Total contractual commitments | 3,583,000,000 | 4,856,000,000
Under 1 Year |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 20,487,000,000 | 20,523,000,000
Contractual loans, equities and mortgages | 869,000,000 | 1,157,000,000
Operating leases |  | 138,000,000
Total contractual commitments | 869,000,000 | 1,295,000,000
1 year to 3 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 9,402,000,000 | 9,635,000,000
Contractual loans, equities and mortgages | 1,039,000,000 | 1,044,000,000
Operating leases |  | 230,000,000
Total contractual commitments | 1,039,000,000 | 1,274,000,000
3 years to 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 9,702,000,000 | 9,326,000,000
Contractual loans, equities and mortgages | 546,000,000 | 536,000,000
Operating leases |  | 182,000,000
Total contractual commitments | 546,000,000 | 718,000,000
Over 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 291,389,000,000 | 273,735,000,000
Contractual loans, equities and mortgages | 1,129,000,000 | 1,063,000,000
Operating leases |  | 506,000,000
Total contractual commitments | 1,129,000,000 | 1,569,000,000
Insurance and investment contract liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 310,987,000,000 | 293,237,000,000
Insurance and investment contract liabilities | Under 1 Year |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 11,931,000,000 | 11,950,000,000
Insurance and investment contract liabilities | 1 year to 3 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 7,983,000,000 | 8,388,000,000
Insurance and investment contract liabilities | 3 years to 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 8,737,000,000 | 8,653,000,000
Insurance and investment contract liabilities | Over 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 282,336,000,000 | 264,246,000,000
Senior debentures and unsecured financing |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 3,828,000,000 | 6,108,000,000
Senior debentures and unsecured financing | Under 1 Year |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 79,000,000 | 438,000,000
Senior debentures and unsecured financing | 1 year to 3 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 439,000,000 | 556,000,000
Senior debentures and unsecured financing | 3 years to 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 131,000,000 | 234,000,000
Senior debentures and unsecured financing | Over 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 3,179,000,000 | 4,880,000,000
Subordinated Debt |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 4,780,000,000 | 4,241,000,000
Subordinated Debt | Under 1 Year |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 114,000,000 | 103,000,000
Subordinated Debt | 1 year to 3 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 229,000,000 | 207,000,000
Subordinated Debt | 3 years to 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 229,000,000 | 207,000,000
Subordinated Debt | Over 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 4,208,000,000 | 3,724,000,000
Bond repurchase agreements |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,850,000,000 | 1,824,000,000
Bond repurchase agreements | Under 1 Year |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,850,000,000 | 1,824,000,000
Bond repurchase agreements | 1 year to 3 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 0 | 0
Bond repurchase agreements | 3 years to 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 0 | 0
Bond repurchase agreements | Over 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 0 | 0
Accounts payable and accrued expenses |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 6,114,000,000 | 5,971,000,000
Accounts payable and accrued expenses | Under 1 Year |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 6,114,000,000 | 5,971,000,000
Accounts payable and accrued expenses | 1 year to 3 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 0 | 0
Accounts payable and accrued expenses | 3 years to 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 0 | 0
Accounts payable and accrued expenses | Over 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 0 | 0
Lease liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,114,000,000 |
Lease liabilities | Under 1 Year |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 153,000,000 |
Lease liabilities | 1 year to 3 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 268,000,000 |
Lease liabilities | 3 years to 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 230,000,000 |
Lease liabilities | Over 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 463,000,000 |
Secured borrowings from mortgage securitization |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,919,000,000 | 1,621,000,000
Secured borrowings from mortgage securitization | Under 1 Year |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 169,000,000 | 182,000,000
Secured borrowings from mortgage securitization | 1 year to 3 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 426,000,000 | 435,000,000
Secured borrowings from mortgage securitization | 3 years to 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 355,000,000 | 187,000,000
Secured borrowings from mortgage securitization | Over 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 969,000,000 | 817,000,000
Borrowed funds |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 388,000,000 | 217,000,000
Borrowed funds | Under 1 Year |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 77,000,000 | 55,000,000
Borrowed funds | 1 year to 3 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 57,000,000 | 49,000,000
Borrowed funds | 3 years to 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 20,000,000 | 45,000,000
Borrowed funds | Over 5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | $ 234,000,000 | $ 68,000,000

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