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Reinsurance - Schedule of Reinsurance Expenses and Benefits (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Insurance Contracts [Abstract] |  |
Recovered claims and benefits | $ 1,955 | $ 1,839
Commissions | 70 | 74
Reserve adjustments | 26 | 25
Operating expenses and other | 80 | 83
Reinsurance (expenses) recoveries | $ 2,131 | $ 2,021

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