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Insurance Contract Liabilities and Investment Contract Liabilities - Impact of Method and Assumption Changes (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of types of insurance contracts [line items] |  |
Net increase (decrease) before income taxes | $ 116 | $ 13
Mortality / Morbidity |  |
Disclosure of types of insurance contracts [line items] |  |
Net increase (decrease) before income taxes | 113 | (347)
Policyholder behaviour |  |
Disclosure of types of insurance contracts [line items] |  |
Net increase (decrease) before income taxes | 207 | 102
Expenses |  |
Disclosure of types of insurance contracts [line items] |  |
Net increase (decrease) before income taxes | (28) | 6
Investment returns |  |
Disclosure of types of insurance contracts [line items] |  |
Net increase (decrease) before income taxes | (10) | 6
Model enhancements and other |  |
Disclosure of types of insurance contracts [line items] |  |
Net increase (decrease) before income taxes | $ (166) | $ 246

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- Definition The increase (decrease) in insurance liabilities, net of reinsurance. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard -URIDate 2019-03-27 + Details
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