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Insurance Contract Liabilities and Investment Contract Liabilities - Impact of Method and Assumption Changes (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of types of insurance contracts [line items]
Net increase (decrease) before income taxes	$ 13	$ (278)
Mortality / Morbidity
Disclosure of types of insurance contracts [line items]
Net increase (decrease) before income taxes	(347)	(337)
Lapse and other policyholder behaviour
Disclosure of types of insurance contracts [line items]
Net increase (decrease) before income taxes	102	563
Expenses
Disclosure of types of insurance contracts [line items]
Net increase (decrease) before income taxes	6	6
Investment returns
Disclosure of types of insurance contracts [line items]
Net increase (decrease) before income taxes	6	(331)
Model enhancements and other
Disclosure of types of insurance contracts [line items]
Net increase (decrease) before income taxes	$ 246	$ (179)

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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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

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