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Commitments and Contingencies - Additional Information (Detail) $ in Millions |  | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2018 USD ($) | May 31, 2018 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Nov. 20, 2015 CAD ($) | Jun. 01, 2015 CAD ($) | Mar. 10, 2015 CAD ($) | Dec. 01, 2014 CAD ($) | Feb. 21, 2014 CAD ($)
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |
Legal settlement amount |  | $ 91 |  |  |  |  |  |  |
Legal settlement amount granted by court | $ 91 |  |  |  |  |  |  |  |
Investment commitments outstanding |  |  | $ 10,372,000,000 | $ 8,235,000,000 |  |  |  |  |
Letters of credit outstanding |  |  | 74,000,000 | 77,000,000 |  |  |  |  |
Aggregate future minimum lease payments |  |  | 575,000,000 | 838,000,000 |  |  |  |  |
Debt outstanding |  |  | 4,769,000,000 | 4,784,000,000 |  |  |  |  |
Variable Surplus Note [member] |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |
Debt outstanding |  |  | 0 | 0 |  |  |  |  |
The Manufacturers Life Insurance Company [Member] |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |
Subordinate guaranteed issued |  |  |  |  | $ 1,000,000,000 | $ 350,000,000 | $ 750,000,000 | $ 750,000,000 | $ 500,000,000
The Manufacturers Life Insurance Company [Member] | Subordinated debentures due on December 15, 2041 [Member] |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |
Guaranteed payment of amounts on subordinated debenture |  |  | 650,000,000 |  |  |  |  |  |
Mature in 30 Days [Member] |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |
Investment commitments outstanding |  |  | 888,000,000 | 682,000,000 |  |  |  |  |
Less than 1 year [Member] |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |
Investment commitments outstanding |  |  | 3,546,000,000 | 2,177,000,000 |  |  |  |  |
Aggregate future minimum lease payments |  |  | 129,000,000 |  |  |  |  |  |
Debt outstanding |  |  |  | 400,000,000 |  |  |  |  |
Mature after One year [Member] |  |  |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |  |  |
Investment commitments outstanding |  |  | $ 5,938,000,000 | $ 5,376,000,000 |  |  |  |  |

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